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formulation of doxycline
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CONTENTS
S.No. TITLE PAGE No.
1.0 INTRODUCTION 04
1.1 FORMULATION OF TABLETS 04
1.2 FILM COATING 11
1.3 ICH GUIDELINES ON STABILITY STUDY 18
2.0 OBJECTIVE OF WORK 22
2.1 PLAN OF WORK 24
3.0 DRUG SPECIFIC REVIEW 25
3.1 LITERATURE REVIEW 26
3.2 EXCIPIENTS PROFILE 32
4.0 MATERIALS & METHODS 63
4.1 LIST OF EQUIPMENTS 63
4.2 LIST OF INGREDIENTS 64
4.3 SELECTION OF EXCIPIENTS 65
4.4 EVALUATION OF MARKET SAMPLE 66
4.5OUTLINE OF MANUFACTURING PROCEDURE & OUTLINE OF COATING PROCEDURE
67
4.6 PRE COMPRESSION PARAMETER 69
4.6.1 LOSS ON DRYING 69
4.6.2 BULK DENSITY 69
4.6.3 TAPPED DENSITY 69
4.6.4 COMPRESSIBILITY INDEX 70
4.6.5 SIEVE ANALYSIS 70
S.No. TITLE PAGE No.
1
4.7 POST COMPRESSION PARAMETER 71
4.7.1 DESCRIPTION 72
4.7.2 WEIGHT VARIATION TEST 72
4.7.3 HARDNESS 73
4.7.4 FRIABILITY 73
4.7.5 DISINTEGRATION TEST 75
4.7.6 IN-VITRO DISSOLUTION STUDY 75
4.7.7 ASSAY 77
5.0 RESULTS AND DISCUSSION 78
5.1 MANUFACTURING OF TRIALS 78
5.2 EVALUATION OF MARKET SAMPLE 80
5.3 INCOMPATIBILITY STUDIES 82
5.4 FORMULATION OF DOXYCYCLINE HYCLATE
TABLETS
84
5.5 EVALUATION OF DOXYCYCLINE HYCLATE
TABLETS & GRANULES
87
5.6 COMPARATIVE DISSOLUTION STUDY FOR
DOXYCYCLINE HYCLATE TABLET
89
5.7 STABILITY STUDY 90
6.0 SUMMARY AND CONCLUSION 91
7.0 BIBLIOGRAPHY 92
LIST OF ABBREVATIONS USED
2
API - Active Pharmaceutical Ingredient
CTD - Common Technical Document
BCS - Biopharmaceutics Classification System
NDA - New Drug Application
USP - United States Pharmacopoeia
HPLC - High Performance Liquid Chromatography
UV - UltraViolet
No - Number
g - Gram
ml - milliliter
IPA - Isopropyl Alcohol
JP - Japan Pharmacopoeia
Ph Euro - European Pharmacopoeia
oC - Degree Celsius
mm - millimeter
FDA - Food & Drug Administration
UK - United Kingdom
# - Mesh Number (Size)
DT - Disintegration
RT - Room Temperature
RH - Relative Humidity
e.g. - Example
1.0 INTRODUCTION:
3
Doxycycline Hydrochloride is (4S, 4aR, 5S, 5aR, 6R, 12aS) -4-dimethylamino-1,
4, 4a, 5, 5a, 6, 11, 12a – octahydro – 3, 5, 10, 12, 12a – pentahydroxy – 6 - methyl -1, 11
– dioxonaphthacene – 2 - carboxamide hydrochloride hemiethanolate hemihydrate,
antimicrobial substance obtained from oxytetracycline or methacycline or by any other
means .
Doxycycline Hyclate tablets contains equivalent of not less than 90% and not more
than 120% of the labeled amount of Doxycycline .
Monograph of Doxycycline is official in IP, BP & USP, where as tablet dosage
form is official in USP only. It is available in 100 & 200 mg tablet dosage form. Apart
from tablets it is available in capsules, dispersible tablets and modified release capsules.
1.1 FORMULATION OF TABLETS:
Tablets are solid unit dosage form of medicaments with or without suitable
diluents and prepared either by molding or compression. They are solid, flat or biconvex
disc in shape. They vary greatly in shape, size and weight which depend upon amount of
medicament used and mode of administration. They also vary in hardness, thickness,
disintegration and dissolution characteristics and in other aspects depending upon their
intended use and method of manufacture. Tablets are the most widely used solid dosage
form of medicament. Because of their advantages their popularity is continuously
increasing day by day.
Tablets are solid unit dosage form of medicaments with or without suitable
diluents and prepared either by molding or compression. They are solid, flat or biconvex
disc in shape. They vary greatly in shape, size and weight which depend upon amount of
4
medicament used and mode of administration. They also vary in hardness, thickness,
disintegration and dissolution characteristics and in other aspects depending upon their
intended use and method of manufacture. Tablets are the most widely used solid dosage
form of medicament. Because of their advantages their popularity is continuously
increasing day by day.
TYPES AND CLASSES OF TABLETS
(A) Oral tablet for ingestion
1. Compressed tablets
2. Multiple compressed tablets
3. Delayed action tablets
4. Sugar coated
5. Film coated tablets
6. Chewable tablets
(B) Tablet used in oral cavity
1. Buccal tablets
2. Sublingual tablets
3. Troches and Lozenges
4. Dental cones
(C) Tablet administered by other routes
1. Implantation tablets
5
2. Vaginal tablets
(D) Tablets used to prepare solution
1. Effervescent tablets
2. Dispensing tablets
3. Hypodermic tablets
4. Tablet triturates
PROPERTIES OF AN IDEAL TABLET
The objective of formulation and fabrication of tablet is to deliver the correct amount of
drug in proper form at or over proper time.
1. Tablet should be elegant having its own identity and free from defects such as
cracks, chips, contamination, discoloration etc.
2. It should have chemical and physical stability to maintain its physical integrity
over time.
3. It should be capable to prevent any alteration in the chemical and physical
properties of medicinal agent(s).
4. It should be capable of withstanding the rigors of mechanical shocks encountered
in its production, packaging, shipping and dispensing.
5. An ideal tablet should be able to release the medicament(s) in body in predictable
and reproducible manner.
COMMONLY USED EXCIPIENTS IN TABLET MANUFACTURING
6
Substances other than active ingredients are commonly referred as excipients. The
commonly used exipients are diluents, binders and adhesives, disintegrants, lubricants,
anti adherents, glidants, fillers, colors and sweeteners etc. Tablet excipients must meet
certain criteria in the formulation such as;
• They must be non toxic and acceptable to the regulatory agencies in all countries
where the product is to be marketed
• They must be commercially available in an acceptable grade in all countries where
the product is to be manufactured.
• Their cost must be acceptably low
• They must be physiologically inert.
• They must be physically and chemically stable by themselves and in combination
with the drug (s) and other tablet components.
• They must be free of any unacceptable microbiologic load.
• They must be color compatible ( not producing any off-color appearance)
• If the drug product is also classified as a food (e.g. certain vitamins products), the
diluents and other exipient must be approved direct to food additives.
• They must have no any deleterious effect on the bioavailability of the drug(s) in
the product.
DILUENTS
These are the inert substances which are added to increase the bulk to make the
tablet of a practical size for compression. Diluents like mannitol, lactose, sorbitol,
sucrose, and inositol when present in sufficient quantity can impart properties to some
compressed tablet that permit disintegration in the mouth by chewing ( Chewable tablet ).
7
In the formulation, the incompatibility of diluents must be considered (Calcium salts used
as diluents for the broad spectrum antibiotics like Tetracycline have been shown to
interfere with the drug absorption from GIT. Microcrystalline cellulose (Avicel®) usually
is used as an excipient in direct compression formula. Hydroxyl propyl methyl cellulose
is used to prolong the release from tablet and as a film former in tablet coating.
BINDERS
Binders are the agents generally used to impart cohesive qualities to the powdered
material. In tablet formulation the diluents ensures that the tablet remains intact after
compression. It improves free flow qualities by formulation of granules of desired
hardness and size. Starch, gelatin, sucrose, glucose, dextrose and lactose are frequently
used as binders. Natural and synthetic gums that have been used include acacia, sodium
alginate, panwar gum, ghatti gum, CMC, veegum etc. Starch paste in varying
concentration from 10-20% are used as a binder. HPMC which is more soluble in cold
water as compared to hot water is also used in special cases. Excessive use of binder in
the tablet may lead to prolong disintegration time which is not desired. Therefore they are
used in prescribed concentration to overcome the same.
LUBRICANTS
Lubricants are the substance which prevent adhesion of the tablet material to the
surface of the dies and punches, reduce interparticle friction, facilitate an easy ejection of
tablets from the die cavity and improves rate of flow of tablet granulation. Commonly
used lubricants are talc, magnesium stearate, calcium stearate, stearic acid, hydrogenated
8
vegetable oil and PEG. The method of adding lubricant is an important factor for
satisfactory results. The quantity of lubricant significantly varies from 0.1 to 5%. The
additions of lubricant to granules in the form of emulsion or suspension are used to
reduce the processing time. The primary problem in the preparation of water soluble
tablet is the selection of satisfactory lubricant. Soluble lubricants include Sodium
benzoate, sodium acetate, sodium chloride and carbowax 4000.
GLIDANTS
A glidant is a substance that improves the flow characteristics of a powder mixture.
These materials are always added in the dry state just prior to compression. The most
commonly used glidants are colloidal silicon dioxide (Cabosil®, Cabot®) and asbestos
free talc. They are used in concentration less than 1%. Talc is also used and may serve
the dual purpose of lubricant/glidant.
DISINTEGRANTS
Disintegrants are the substance or a mixture of substances added to a tablet to
facilitate its break up or disintegration after administration. Starches, clays, cellulose and
cross linked polymers are most commonly used disintegrants. The oldest and still the
most popular disintegrants are corn and potato starch. Other ingredients like veegum,
methyl cellulose, agar, bentonite, cellulose, citrus pulp and CMC are also used. They are
mostly added into two portions, one part is added prior to granulation and the remainder
is mixed with the lubricant and finally both are mixed just before the compression.
COLOURING AGENTS
9
Colors in compressed tablet are used to impart aesthetic appearance to the dosage
form. Colour helps the manufacturer to control the product during its preparation as well
as serves as a means of identification to the user. One of the basic requirements
concerning the use of colorant in pharmaceuticals is it must be approved and certified by
the FDA. Colourants can be used in solution form or in suspension form. Pproper
distribution of suspended colourants in the coating solution requires the use of the
powdered colourants (<10 microns). Most commonly used colourants in use are certified
FD & C or D & C colourants. These are synthetic dyes or lakes. Lakes are choice for
sugar or film coating as they give reproducible results. Concentration of colourants in the
coating solutions depends on the colour shade desired, the type of dye, and the
concentration of opaquant-extenders. If very light shade is desired, concentration of less
than 0.01 % may be adequate on the other hand, if a dark colour is desired a
concentration of more than 2.0 % may be required. The inorganic materials (e.g. iron
oxide) and the natural colouring materials (e.g. anthrocyanins, carotenoids, etc) are also
used to prepare coating solution. Magenta red dye is non absorbable in biologic system
and resistant to degradation in the gastro intestinal tract. Flavouring agents Flavours are
usually limited to chewable tablets or other tablets intended to dissolve in the mouth. In
general flavours that are water soluble have been found little acceptance in manufacturing
of tablets because of there poor stability. Flavouring agents do not affect any physical
characteristics of the tablet granulation.
METHOD OF TABLET PREPARATION
There are three general methods of tablet preparation.
1. Direct compression method
2. Dry granulation method
10
3. Wet granulation method
1.2 FILM COATING
Film coating is deposition of a thin film of polymer surrounding the tablet core.
Conventional pan equipments may be used but now a day’s more sophisticated
equipments are employed to have a high degree of automation and coating time. The
polymer is solubilized into solvent. Other additives like plasticizers and pigments are
added. Resulting solution is sprayed onto a rotated tablet bed. The drying conditions
cause removal of the solvent, giving thin deposition of coating material around each
tablet core.
BASIC PROCESS REQUIREMENTS FOR FILM COATING
The fundamental requirements are independent of the actual type of equipments
being used and include adequate means of atomizing the spray liquid for application to
the tablet core, adequate mixing and agitation of tablet bed, sufficient heat input in the
form of drying air to provide the latent heat of evaporation of the solvent. This is
particularly important with aqueous-based spraying and good exhaust facilities to remove
dust and solvent laden air.
DEVELOPMENT OF FILM COATING FORMULATIONS
If the following questions are answered concomitantly then one can go for film coating:
Colour, shape and size of final coated tablet are important for marketing and these
properties have a significant influence on the marketing strategies. An experienced
11
formulator usually takes the pragmatic approach and develops a coating formulations
modification of one that has performed well in the past. Spraying or casting films can
preliminarily screen film formulations. Cast films cab is prepared by spreading the
coating composition on teflon, glass or aluminum foil surface using a spreading bar to get
a uniform film thickness. Sprayed films can be obtained by mounting a plastic-coated
surface in a spray hood or coating pan.
COATING FORMULA OPTIMIZATION
Basic formula is obtained from past experience or from various sources in the
literature. Modifications are required to improve adhesion of the coating to the core, to
decrease bridging of installations, to increase coating hardness, etc. Usually concentration
of colorant and opaquant are fixed to get predetermined shade. Common modification is
to alter polymer-to-plasticizer ratio or addition of different plasticizer/ polymer.
Experimentation of this type can be best achieved by fractional factorial study.
MATERIALS USED IN FILM COATING
I.Film formers, which may be enteric or nonenteric
II.Solvents
III.Plasticizers
IV.Colourants
V.Opaquant-Extenders
VI. Miscellaneous coating solution components
12
I.FILM FORMERS
Ideal requirements of film coating materials are summarized below:
i) Solubility in solvent of choice for coating preparation
ii) Solubility requirement for the intended use e.g. free water-solubility, slow water-
solubility or pH -dependent solubility
iii) Capacity to produce an elegant looking product
iv) High stability against heat, light, moisture, air and the substrate being coated
v) No inherent colour, taste or odor
vi) High compatibility with other coating solution additives
vii) Nontoxic with no pharmacological activity
viii) High resistance to cracking
ix) Film former should not give bridging or filling of the debossed tablet
x) Compatible to printing procedure
Commonly used film formers are as follow
i.HYDROXY PROPYL METHYL CELLULOSE (HPMC)
It is available in different viscosity grades. It is a polymer of choice for air suspension
and pan spray coating systems because of solubility characteristic in gastric fluid, organic
and aqueous solvent system. Advantages include: it does not affect tablet disintegration
and drug availability, it is cheap, flexible, highly resistant to heat, light and moisture, it
has no taste and odor, colour and other additives can be easily incorporated.
13
Disadvantage includes: when it is used alone, the polymer has tendency to bridge or fill
the debossed tablet surfaces. So mixture of HPMC and other polymers/ plasticizers is
used.
ii.METHYL HYDROXY ETHYL CELLULOSE (MHEC)
It is available in wide variety of viscosity grades. It is not frequently used as HPMC
because soluble in fewer organic solvents.
iii. ETHYL CELLULOSE (EC)
Depending on the degree of ethoxy substitution, different viscosity grades are available.
It is completely insoluble in water and gastric fluids. Hence it is used in combination with
water-soluble additives like HPMC and not alone. Unplasticized ethyl cellulose films are
brittle and require film modifiers to obtain an acceptable film formulation. Aqua coat is
aqueous polymeric dispersion utilizing ethyl cellulose. These pseudolatex systems
contain high solids, low viscosity compositions that have coating properties quite
different from regular ethyl cellulose solution.
iv.HYDROXY PROPYL CELLULOSE (HPC)
It is soluble in water below 40oc (insoluble above 45 oC), gastric fluid and many polar
organic solvents. HPC is extremely tacky as it dries from solution system. It is used for
sub coat and not for colour or glass coat. It gives very flexible film.
v. POVIDONE
Degree of polymerization decides molecular weight of material. It is available in four
viscosity grades i.e. K-15, K-30, K-60 and K-90. Average molecular weight of these
grades is 10000, 40000, 160000 and 360000 respectively. K-30 is widely used as tablet
binder and in tablet coating. It has excellent solubility in wide variety of organic solvents,
water, gastric and intestinal fluids. Povidone can be cross-linked with other materials to
14
produce films with enteric properties. It is used to improve dispersion of colourants in
coating solution.
vi. SODIUM CARBOXY METHYL CELLULOSE
It is available in medium, high and extra high viscosity grades. It is easily dispersed in
water to form colloidal solutions but it is insoluble in most organic solvents and hence
not a material of choice for coating solution based on organic solvents. Films prepared by
it are brittle but adhere well to tablets. Partially dried films of are tacky. So coating
compositions must be modified with additives.
viii. POLYETHYLENE GLYCOLS (PEG)
Lower molecular weights PEG (200-600) are liquid at room temperature and are used as
plasticizers. High molecular weights PEG (900-8000series) are white, waxy solids at
room temperature. Combination of PEG waxes with CAP gives films that are soluble in
gastric fluids.
ix. ACRYLATE POLYMERS
E is cationic. EudragitIt is marketed under the name of Eudragit E is freely soluble in
gastric fluid up to pH 5 andco-polymer. Only Eudragit expandable and permeable
above pH 5. This material is available as organic solution (12.5% in
isopropanol/acetone), solid material or 30% aqueous RLdispersion. Eudragit & RS are
co-polymers with low content of quaternary ammonium groups. These are available only
as organic solutions and solid materials. They produce films for delayed action (pH
dependent).
II. SOLVENTS
15
Solvents are used to dissolve or disperse the polymers and other additives and convey
them to substrate surface.
Ideal requirement are summarized below:
i) Should be either dissolve/disperse polymer system
ii) Should easily disperse other additives into solvent system
iii) Small concentration of polymers (2-10%) should not in an extremely viscous solution
system creating processing problems
iv) Should be colourless, tasteless, odorless, inexpensive, inert, nontoxic and
nonflammable
v) Rapid drying rate
vi) No environmental pollution
Mostly solvents are used either alone or in combination with water, ethanol, methanol,
isopropanol, chloroform, acetone, methylene chloride, etc. Water is more used because
no environmental and economic considerations. For drugs that readily hydrolyze in
presence of water, non aqueous solvents are used.
III. PLASTICIZERS
As solvent is removed, most polymeric materials tend to pack together in 3-D honey
comb arrangement. “Internal” or “External” plasticizing technique is used to modify
quality of film. Combination of plasticizer may be used to get desired effect.
Concentration of plasticizer is expressed in relation to the polymer being plasticized.
Recommended levels of plasticizers range from 1-50 % by weight of the film former.
Commonly used plasticizers are castor oil, PG, glycerin, lower molecular weight (200-
400 series), PEG, surfactants, etc. For aqueous coating PEG and PG are more used while
castor oil and spans are primarily used for organic-solvent based coating solution.
16
External plasticizer should be soluble in the solvent system used for dissolving the film
former and plasticizer. The plasticizer and the film former must be at least partially
soluble or miscible in each other.
IV. COLOURANTS
Colourants can be used in solution form or in suspension form. To achieve proper
distribution of suspended colourants in the coating solution requires the use of the
powdered colourants (<10 microns). Most common colourants in use are certified FD &
C or D & C colourants. These are synthetic dyes or lakes. Lakes are choice for sugar or
film coating as they give reproducible results. Concentration of colourants in the coating
solutions depends on the colour shade desired, the type of dye, and the concentration of
opaquant-extenders. If very light shade is desired, concentration of less than 0.01 % may
be adequate on the other hand, if a dark colour is desired a concentration of more than 2.0
% may be required. The inorganic materials (e.g. iron oxide) and the natural colouring
materials (e.g. anthrocyanins, carotenoids, etc) are also used to prepare coating solution.
Magenta red dye is non absorbable in biologic system and resistant to degradation in the
gastro (opaque colour concentrate for film coating) andintestinal track. Opasray
(complete film coating concentrate) are promoted as achieving lessOpadry lot-to-lot
colour variation.
V. OPAQUANT-EXTENDERS
These are very fine inorganic powder used to provide more pastel colours and increase
film coverage. These inorganic materials provide white coat or mask colour of the tablet
core. Colourants are very expensive and higher concentration is required. These inorganic
materials are cheap. In presence of these inorganic materials, amount of colourants
required decreases. Most commonly used materials are titanium dioxide, silicate (talc
&aluminum silicates), carbonates (magnesium carbonates), oxides (magnesium oxide) &
hydroxides (aluminum hydroxides). Pigments were investigated in the production of
17
opaque films and it was found that they have good hiding power and film-coated tablets
have highlighted intagliations.
1.3 ICH GUIDELINES ON STABILITY STUDY
The following guideline is a revised version of the ICH Q1A guideline and
defines the stability data package for a new drug substance or drug product that is
sufficient for a registration application within the three regions of the EC, Japan,
and the United States. It does not seek necessarily to cover the testing for
registration in or export to other areas of the world.
The guideline seeks to exemplify the core stability data package for new
drug substances and products, but leaves sufficient flexibility to encompass the
variety of different practical situations that may be encountered due to specific
scientific considerations and characteristics of the materials being evaluated.
Alternative approaches can be used when there are scientifically justifiable
reasons.
SCOPE OF THE GUIDELINE
The guideline addresses the information to be submitted in registration
applications for new molecular entities and associated drug products. This
guideline does not currently seek to cover the information to be submitted for
abbreviated or abridged applications, variations, clinical trial applications, etc.
18
Specific details of the sampling and testing for particular dosage forms in their
proposed container closures are not covered in this guideline.
Further guidance on new dosage forms and on biotechnological/biological
products can be found in ICH guidelines Q1C and Q5C, respectively.
GENERAL PRINCIPLES
The purpose of stability testing is to provide evidence on how the quality of
a drug substance or drug product varies with time under the influence of a variety
of environmental factors such as temperature, humidity, and light, and to establish
a re-test period for the drug substance or a shelf life for the drug product and
recommended storage conditions.
The choice of test conditions defined in this guideline is based on an
analysis of the effects of climatic conditions in the three regions of the EC, Japan
and the United States. The mean kinetic temperature in any part of the world can
be derived from climatic data, and the world can be divided into four climatic
zones, I-IV. This guideline addresses climatic zones I and II.
The principle has been established that stability information generated in any
one of the three regions of the EC, Japan and the United States would be mutually
acceptable to the other two regions, provided the information is consistent with this
guideline and the labeling is in accord with national/regional requirements.
19
STRESS TESTING
Stress testing of the drug substance can help identify the likely degradation
products, which can in turn help establish the degradation pathways and the
intrinsic stability of the molecule and validate the stability indicating power of the
analytical procedures used. The nature of the stress testing will depend on the
individual drug substance and the type of drug product involved.
Stress testing is likely to be carried out on a single batch of the drug
substance. It should include the effect of temperatures (in 10°C increments (e.g.,
50°C, 60°C, etc.) above that for accelerated testing), humidity (e.g., 75% RH or
greater) where appropriate, oxidation, and photolysis on the drug substance. The
testing should also evaluate the susceptibility of the drug substance to hydrolysis
across a wide range of pH values when in solution or suspension. Photostability
testing should be an integral part of stress testing. The standard conditions for
photostability testing are described in ICH Q1B.
Examining degradation products under stress conditions is useful in
establishing degradation pathways and developing and validating suitable
analytical procedures. However, it may not be necessary to examine specifically
for certain degradation products if it has been demonstrated that they are not
formed under accelerated or long term storage conditions.
Results from these studies will form an integral part of the information
provided to regulatory authorities.
20
SELECTION OF BATCHES
Data from formal stability studies should be provided on at least three
primary batches of the drug substance. The batches should be manufactured to a
minimum of pilot scale by the same synthetic route as, and using a method of
manufacture and procedure that simulates the final process to be used for,
production batches. The overall quality of the batches of drug substance placed on
formal stability studies should be representative of the quality of the material to be
made on a production scale.
TESTING FREQUENCY
For long-term studies, frequency of testing should be sufficient to establish
the stability profile of the drug substance. For drug substances with a proposed re-
test period of at least 12 months, the frequency of testing at the long term storage
condition should normally be every 3 months over the first year, every 6 months
over the second year, and annually thereafter through the proposed re-test period.
At the accelerated storage condition, a minimum of three time points,
including the initial and final time points (e.g., 0, 3, and 6 months), from a 6-month
study is recommended. Where an expectation (based on development experience)
exists that results from accelerated studies are likely to approach significant change
criteria, increased testing should be conducted either by adding samples at the final
time point or by including a fourth time point in the study design.
When testing at the intermediate storage condition is called for as a result of
significant change at the accelerated storage condition, a minimum of four time
points, including the initial and final time points (e.g., 0, 6, 9, 12 months), from a
12-month study is recommended.
21
STORAGE CONDITIONS
In general, a drug substance should be evaluated under storage conditions
(with appropriate tolerances) that test its thermal stability and, if applicable, its
sensitivity to moisture. The storage conditions and the lengths of studies chosen
should be sufficient to cover storage, shipment, and subsequent use.
The long term testing should cover a minimum of 12 months’ duration on at
least three primary batches at the time of submission and should be continued for a
period of time sufficient to cover the proposed re-test period. Additional data
accumulated during the assessment period of the registration application should be
submitted to the authorities if requested. Data from the accelerated storage
condition and, if appropriate, from the intermediate storage condition can be used
to evaluate the effect of short term excursions outside the label storage conditions
(such as might occur during shipping).
Long term, accelerated, and, where appropriate, intermediate storage
conditions for drug substances are detailed in the sections below. The general case
applies if the drug substance is not specifically covered by a subsequent section.
Alternative storage conditions can be used if justified.
22
2.0 OBJECTIVE OF WORK
The objective of this work is formulation and evaluation of Doxycycline Hyclate
Tablets, which comprises of
* Literature Survey
* Innovator Product Characteristics
* Preformulation Studies
* Formulation development of core tablets
* Analysis of Trials
* Coating of final formula
* Comparative Study
* Stability study of final formula
23
2.1 PLAN OF WORK
Literature Collection
Evaluation of Market Sample
Selection of Excipients
Formulation of Doxycycline Hyclate tablets
Evaluation of Doxycycline Hyclate tablets
Pre-compression Characteristics Post-compression Characteristics
% Water Content Thickness
Bulk Density Hardness
Tapped Density Friability
Compressibility Index Weight variation
Sieve analysis In-vitro dissolution study
Assay
Stability study
24
3.0 DRUG PROFILE
DOXYCYCLINE HYCLATE
Category: Anti bacterial
Dosage forms available Tablets, Capsules, Modified release capsules
Physico – chemical properties
Dose
Description A yellow crystalline powder, hygroscopic.
Solubility Freely soluble in water and methyl alcohol. Practically insoluble in chloroform and ether.
Standard
pH 2.0 to 3.0 in solution contains 10mg of Doxycycline per ml
Water 1.4% to 2.8%
Molecular Weight 512.94
Molecular Formula & Chemical Name
C22H24HClN2O8½ C2H6O.½ H2ODoxycycline hydrochloride hemi ethanolate hemi hydrate
Melting Point 110CLoss On Drying NMT 0.5%
Pharmacokinetics
Route of administration Oral
Absorption Completely absorbed
T max 2.6g / ml
t½ 12 to 24 Hours
Effect of food Food does not affected the extent and absorption
Plasma protein binding 80 to 95%
Metabolism at Liver
Excretion Through facieses
US Innovator Product Observations
Vibramycin
Storage Store in air tight containers
25
3.1 LITERATURE REVIEW
Edward B. Breitschwerdt, et.al, experimented Doxycycline Hyclate in the
treatment of Canine Ehrlichiosis Followed by Challenge Inoculation with two
Ehrlichia canis Strains dogs were experimentally inoculated with Ehrlichia canis
Florida to assess the efficacy of doxycycline hyclate for the treatment of acute
ehrlichiosis. Treatment with doxycycline eliminated infection in eight of eight dogs.
Untreated infected control dogs appeared to eliminate the infection or, alternatively,
suppress the degree of ehrlichiemia to a level not detectable by tissue culture
isolation or PCR or by transfusion of blood into recipient dogs. Prior infection did
not infer protection against homologous (strain Florida) or heterologous (strain
NCSU Jake) strains of E. canis. We conclude that doxycycline hyclate is an
effective treatment for acute E. canis infection; however, these results may not be
applicable to chronic infections in nature. Spontaneous resolution of infection,
induced by the dog's innate immune response, provides evidence that an E. canis
vaccine, once developed, might potentially confer protective immunity against the
organism.
Meijer LA, et.al. performed Pharmacokinetics and bioavailability of
doxycycline hyclate after oral administration in calves in which the bioavailability
and pharmacokinetics of doxycycline hyclate were determined in calves with
immature rumen function. The bioavailability of doxycycline after oral
administration in a milk replacer was approximately 70%. The elimination half-life
of doxycycline was found to be 9.5 +/- 3.0 h. after intravenous administration, and
12.6 +/- 5.0 h. after single oral administration. Plasma concentrations were
determined after repeated oral administration of doxycycline dissolved in a milk
replacer, at a dose of 5 mg per kg body weight, twice daily. During the period of
26
administration, the plasma concentrations varied between Cmin of 1.0 +/- 0.19
mg/L and Cmax of 2.3 +/- 0.19 mg/L.
Stoller NH, et. al, experimented the pharmacokinetic profile of a
biodegradable controlled-release delivery system containing doxycycline hyclate
compared to systemically delivered doxycycline in gingival crevicular fluid, saliva,
and serum.
The primary goal of this study was to characterize the release profile of doxycycline
hyclate (8.5% w/w) from a biodegradable controlled-release delivery system (DH)
placed in periodontal pockets. Pharmacokinetic data were obtained from gingival
crevicular fluid (GCF), saliva, and serum of adult periodontitis patients. These
results were compared to those obtained from individuals who received standard
oral doses of doxycycline hyclate (200 mg on day 0, then 100 mg/day for 7 days).
All participants presented with multiple pockets > or = 5 mm that bled upon
probing. At the baseline visit patients receiving local drug delivery had all pockets >
or = 5 mm that bled upon probing on one side of the mouth filled with DH. Drug
retention was enhanced with 1 of 2 periodontal dressings (non-eugenol [NE] or 2-
octyl cyanoacrylate [2-octyl]). Doxycycline concentrations were analyzed with the
aid of reverse phase high performance liquid chromatography. GCF saliva, and
serum samples were obtained just prior to drug delivery and then at hours 2, 4, 6, 8,
18, 24 and days 2, 3, 5, 7, and 8. GCF and saliva samples were also obtained at days
10, 14, 21, and 28. Thirty two subjects participated in the study; 13 in the NE group,
13 in the 2-octyl group, and 6 in the group taking oral doxycycline. The release of
doxycycline in the GCF peaked at 2 hours (1473 microg/ml in the NE group, and
1986 microg/ml in the 2-octyl group). The mean concentration at day 7 was 309
microg/ml for the NE group and 148 microg/ml for the 2-octyl group. Minimal
levels of drug were detected in the GCF of the oral doxycycline group with a peak
27
concentration of 2.53 microg/ml at 12 hours. Salivary concentrations for both local
delivery groups peaked at hour 2 (4.05 microg/ml for the NE group and 8.78
microg/ml for the 2-octyl group); by the end of day 1 levels were < or = 2
microg/ml. For subjects who took the oral doxycycline, salivary concentrations
never exceeded 0.11 microg/ml. Serum concentrations of doxycycline for
individuals receiving the local drug delivery never exceeded 0.1 microg/ml. For the
oral doxycycline group serum concentrations ranged from 0.91 to 2.26 microg/ml
over the 8 days data were collected. The high concentration of drug available at the
treated sites coupled with the relatively low levels in the saliva and almost non-
existent levels in the serum indicate that this biodegradable controlled-release
delivery system displays an appropriate pharmacokinetic profile for the delivery of
doxycycline into periodontal pockets
Monica L. Dumont et. al., investigated about probability of passing
dissolution criteria for immediate release tablets. During development of solid
dosage products, a pharmaceutical manufacturer is typically required to propose
dissolution criteria unless the product false into Biopharmaceutics Classification
System (BCS) Class1, in which case disintegration test may be used. At the time of
filing the new drug application (NDA) or common technical document (CTD), the
manufacture has already met with regulatory agencies to discuss and refine
dissolution strategy. The dissolution acceptance criteria are based on stability and
batch history data and are often arrived at by considering the percentage of batches
that pass United States Pharmacopeias (USP) criteria at Stage 1(S1), when in fact,
the product is deemed unacceptable only when a batch fails USP criteria at Stage 3
(S3).Calculating the probability of passing (or failing) dissolution criteria at S1, S2,
or S3 can assist a manufacturer in determining appropriate acceptance criteria. The
article discusses a general statistical method that was developed to assess the
28
probability of passing the multistage USP test for dissolution and how it was
applied to an immediate release tablet formulation. In this case, acceptance criteria
were set and the analysis was conducted to assess the probabilities of passing or
failing based on this acceptance criterion. Whether the acceptance criteria were
relevant to the product was also considered. This mathematical approach uses a
Monte Carlo simulation and considers a range of values for standard deviation and
mean of historical data
Riond JL., et.al, investigated Comparative pharmacokinetics of doxycycline
hyclate in cats and dogs.in which disposition of doxycycline hyclate was studied in
six adult mixed-breed female cats and six adult mid-sized female dogs following a
single intravenous administration of 5 mg/kg body weight. Doxycycline volume of
the central compartment, area volume of distribution, volume of distribution at
steady state, and total body clearance were significantly smaller in cats. The
differences were attributed to more extensive binding of doxycycline to plasma
protein including albumin in cats. The significant differences in the volume of
distribution and total body clearance were not reflected in elimination half-lives
under the conditions of this study (sample size, inhomogeneous population).
Doxycycline elimination half-life was 4.56 +/- 0.68 (SEM) h for cats and 6.99 +/-
1.09 h for dogs. Dosage regimens recommended in the veterinary literature were
evaluated by the computer program PETDR.
Zeidner NS, et. al, performed the formulation of doxycycline hyclate for
prophylaxis of tick bite infection in a murine model of Lyme borreliosis.The
prophylactic potential of a single injection of doxycycline hyclate (Atridox) was
compared to that of a single oral dose of doxycycline hyclate in a murine model of
Lyme borreliosis. Prophylaxis, as measured by the lack of cultivable spirochetes and
demonstrable pathology, was noted for 43% of orally treated mice; in contrast, the
29
release characteristics of doxycycline hyclate completely protected mice from
infection and resultant pathology.
Alsarra IA, et, al, Comparared the bioavailability study of doxycycline
hyclate (equivalent to 100 mg doxycycline) capsules (doxycin vs vibramycin) for
bioequivalence evaluation in healthy adult volunteers which was carried out to
evaluate the bioavailability of a new capsule formulation of doxycycline (100 mg),
doxycin, relative to the reference product, vibramycin (100 mg) capsules. The
bioavailability was carried out in 24 healthy male volunteers who received a single
dose (100 mg) of the test (A) and the reference (B) products after an overnight fast
of at least 10 hours on 2 treatment days. The treatment periods were separated by a
2-week washout period. A randomized, balanced 2-way cross-over design was used.
After dosing, serial blood samples were collected for a period of 48 hours. Plasma
concentrations of doxycycline were analyzed by a sensitive and validated high-
performance liquid chromatography assay. The pharmacokinetic parameters for
doxycycline were determined using standard noncompartmental methods. The
parameters AUC(0-t), AUC(0-infinity), Cmax, K(el), t(1/2) and Cmax/AUC(0-
infinity) were analyzed statistically using log-transformed data. The time to
maximum concentration (tmax) was analyzed using raw data. The parametric 90%
confidence intervals of the mean values of the pharmacokinetic parameters: AUC(0-
t), AUC(0-infinity), Cmax and Cmax/AUC(0-infinity) were within the range 80-
125% which is acceptable for bioequivalence (using log-transformed data). The
calculated 90% confidence intervals based on the ANOVA analysis of the mean
test/reference ratios of AUC(0-t), AUC(0-infinity), Cmax and Cmax/AUC(0-
infinity) were 95.98-109.56%, 92.21 to 107.66%, 93.90-112.56%, and 96.0 to
106.91% respectively. The test formulation was found bioequivalent to the
reference formulation with regard to AUC(0-t), AUC(0-infinity), Cmax and
30
Cmax/AUC(0-infinity) by the Schuirmann's two 1-sided t-tests. Therefore, the 2
formulations were considered to be bioequivalent.
Vargas-Estrada D, et. al, performed Pharmacokinetics of doxycycline and
tissue concentrations of an experimental long-acting parenteral formulation of
doxycycline in Wistar rats.which shows that antibacterial with time-dependent
action, was formulated as a non-irritating long-acting parenteral formulation based
on a beta-cyclodextrin: poloxamer-based matrix (doxycycline-h-LA). Tissue and
serum concentrations vs time profile were investigated after its subcutaneous
injection to Wistar rats. Serum concentration profiles and key pharmacokinetic (PK)
variables of doxycycline-h-LA were compared to the corresponding profiles and PK
values obtained with an aqueous formulation of doxycycline-h administered either
intramuscularly, orally or intravenously to Wistar rats. In all groups, the dose was
10 mg/kg. Doxycycline-h-LA showed outstanding bioavailability (951% or 477% if
a correction formula is considered), as compared to the one obtained with an
aqueous formulation (106-82%, respectively). Corresponding values for maximum
serum concentration were 3.19 microg/ml and 3.00 microg/ml, respectively, and
elimination half-lives were completely different: 42.49 h and 2.77 h for
doxycycline-h-LA and the aqueous formulation, respectively. Considering minimal
inhibitory concentrations of doxycycline for sensitive and resistant bacteria (from <
or = 0.5 to > or =1.5 microg/ml), doxycycline-h-LA could be injected every 2 or 3
days, while aqueous doxycycline-h would require a dosing interval from 7.5 to 11 h.
But if tissue concentrations are taken as braking points, the dosing interval will vary
from 48 to 94 h. For doxycycline-h-LA, mean tissue:serum ratios were 2:1 for
lungs, 9.8:1 for kidneys and 2.2:1 for intestine homogenates. These values are in
close agreement with those found for the distribution of doxycycline in other
species.
31
3.2 EXCIPIENTS PROFILE
MICROCRYSTALLINE CELLULOSE
Synonyms:
Avicel, Cellulose gel, crystalline cellulose, E460, Emocel, Fibrocel,
Tabulose, Vivacel.
Functional category:
Tablet and Capsule diluent, suspending agent, adsorbent and tablet
disintegrant.
Applications:
As a diluent in tablets (wet granulation and direct compression) and capsule
formulation. It also has some lubricant and disintegrant property.
Description:
White-colored, tasteless crystalline powder composed of porous particles. It
is commercially available in different particle sizes and moisture grades. That
have different properties and application.
Solubility:
Slightly soluble in 5 % w/v NaOH solution, practically insoluble in water,
dilute acids and most organic solvents.
Stability:
It is a stable, though hygroscopic material.
32
Storage conditions:
The bulk material should be stored in a well-closed container in a cool, dry,
place.
Incompatibilities:
Incompatible with strong oxidizing agents.
Safety:
It is generally regarded as a nontoxic and nonirritant material
pH:
Between 5.5 and 8.0
Loss on drying:
Not more than 10.0%, determined on 0.5 g by drying in an oven at 105o
MAGNESIUM STEARATE
Magnesium Stearate consists mainly of magnesium stearate (C17H35CO2)2Mg
with variable proportions of magnesium palmitate, (C15H31CO2)2Mg and
magnesium oleate, (C17H33CO2)2Mg.
Category:
Pharmaceutical aid (lubricant).
Description:
Very fine, light, white powder; odourless or with a very faint odour of
stearic acid; unctuous and free from grittiness.
33
Solubility:
Practically insoluble in water, ethanol and ether.
STANDARDS
Magnesium Stearate contains not less than 3.8 per cent and not more than
5.0 per cent of Mg, calculated with reference to the dried substance.
Loss on drying:
Not more than 6.0%, determined on 1 g by drying in an oven at 105o.
ISOPROPYL ALCOHOL
NONPROPRIETARY NAMES BP: ISOPROPYL ALCOHOL
JP: Isopropanol
PhEur: Alcohol isopropylicus
USP: Isopropyl alcohol
Synonyms
Dimethyl carbinol; IPA; isopropanol; petrohol; 2-propanol; sec-propyl
alcohol.
Chemical Name and CAS Registry Number
Propan-2-ol [67-63-0]
Empirical Formula and Molecular Weight
C3H8O 60.1
34
STRUCTURAL FORMULA
Functional Category
Disinfectant; solvent.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Isopropyl alcohol (propan-2-ol) is used in cosmetics and pharmaceutical
formulations primarily as a solvent in topical formulations. It is not recommended
for oral use owing to its toxicity.
Although it is used in lotions, the marked degreasing properties of isopropyl
alcohol may limit its usefulness in preparations used repeatedly. Isopropyl alcohol
is also used as a solvent both for tablet film-coating and for tablet granulation,
where the isopropyl alcohol is subsequently removed by evaporation. It has also
been shown to significantly increase the skin permeability of nimesulide from
carbomer 934.
Isopropyl alcohol has some antimicrobial activity and a 70% v/v aqueous
solution is used as a topical disinfectant. Therapeutically, isopropyl alcohol has
been investigated for the treatment of postoperative nausea or vomiting.
Description
Isopropyl alcohol is a clear, colorless, mobile, volatile, flammable liquid
with a characteristic, spirituous odor resembling that of a mixture of ethanol and
acetone; it has a slightly bitter taste.
35
TYPICAL PROPERTIES
Antimicrobial activity:
Isopropyl alcohol is bactericidal; at concentrations greater than 70% v/v it is
a more effective antibacterial preservative than ethanol (95%). The bactericidal
effect of aqueous solutions increases steadily as the concentration approaches
100% v/v. Isopropyl alcohol is ineffective against bacterial spores.
Autoignition temperature: 425°C
Boiling point: 82.4°C
Explosive limits: 2.5–12.0% v/v in air.
Flammability: flammable.
Flash point:
11.7°C (closed cup); 13°C (open cup). The water azeotrope has a flash point
of 16°C.
Freezing point: −89.5°C
Melting point: −88.5°C
Moisture content:
0.1–13% w/w for commercial grades (13% w/w corresponds to the water
azeotrope).
Refractive index:
n20D = 1.3776;
n25D = 1.3749.
36
Solubility:
Miscible with benzene, chloroform, ethanol (95%), ether, glycerin, and
water. Soluble in acetone; insoluble in salt solutions. Forms an azeotrope with
water, containing 87.4% w/w isopropyl alcohol (boiling point 80.37°C).
Specific gravity: 0.786
Vapor density (relative): 2.07 (air = 1)
STABILITY AND STORAGE CONDITIONS
Isopropyl alcohol should be stored in an airtight container in a cool, dry
place.
Safety
Isopropyl alcohol is widely used in cosmetics and topical pharmaceutical
formulations. It is readily absorbed from the gastrointestinal tract and may be
slowly absorbed through intact skin. Prolonged direct exposure of isopropyl
alcohol to the skin may result in cardiac and neurological deficits. In neonates,
isopropyl alcohol has been reported to cause chemical burns following topical
application.
Isopropyl alcohol is metabolized more slowly than ethanol, primarily to
acetone. Metabolites and unchanged isopropyl alcohol are mainly excreted in the
urine.
Regulatory Status
Included in the FDA Inactive Ingredients Guide (oral capsules, tablets, and
topical preparations). Included in nonparenteral medicines licensed in the UK.
Included in the Canadian List of Acceptable Non-medicinal Ingredients.
37
TALC
Synonyms: Purified Talc; Talcum
Talc is a powdered, selected natural hydrated magnesium silicate. It may
contain varying amounts of aluminium and iron.
Category:
Anticaking agent, glidant, tablet and capsule diluant, tablet & capsule
lubricant.
Solubility:
Practically insoluble in water and in dilute solutions of acids and alkali
hydroxides.
Storage: Store in well-closed containers.
Loss on drying:
Not more than 1.0%, determined on 1 g by drying in an oven at 180o for 1
hour.
38
STARCH
NONPROPRIETARY NAMES
• BP: Maize starch
• Potato starch
• Rice starch
• Tapioca starch
• Wheat starch
• JP: Corn starch
• Potato starch
• Rice starch
• Wheat starch
Synonyms
Amido; amidon; amilo; amylum; Aytex P; C*PharmGel; Fluftex W; Instant
Pure-Cote; Melojel; Meritena; Paygel 55; Perfectamyl D6PH; Pure-Bind; Pure-
Cote; Pure-Dent; Pure-Gel; Pure-Set; Purity 21; Purity 826; Tablet White.
Chemical Name and CAS Registry Number
Starch [9005-25-8]
Empirical Formula and Molecular Weight
(C6H10O5)n 50 000–160 000
where n = 300–1000.
39
Functional Category
Glidant; tablet and capsule diluent; tablet and capsule disintegrant; tablet
binder.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Starch is used as an excipient primarily in oral solid-dosage formulations
where it is utilized as a binder, diluent, and disintegrant. As a diluent, starch is used
for the preparation of standardized triturates of colorants or potent drugs to
facilitate subsequent mixing or blending processes in manufacturing operations.
Starch is also used in dry-filled capsule formulations for volume adjustment of the
fill matrix.
In tablet formulations, freshly prepared starch paste is used at a
concentration of 5–25% w/w in tablet granulations as a binder. Selection of the
quantity required in a given system is determined by optimization studies, using
parameters such as granule friability, tablet friability, hardness, disintegration rate,
and drug dissolution rate.
Starch is one of the most commonly used tablet disintegrants at
concentrations of 3–15% w/w.2–9 However, unmodified starch does not compress
well and tends to increase tablet friability and capping if used in high
concentrations. In granulated formulations, about half the total starch content is
included in the granulation mixture and the balance as part of the final blend with
the dried granulation. Also, when used as a disintegrant, starch exhibits type II
isotherms and has a high specific surface for water sorption.
40
Description
Starch occurs as an odorless and tasteless, fine, white-colored powder
comprising very small spherical or ovoid granules whose size and shape are
characteristic for each botanical variety.
TYPICAL PROPERTIES
Acidity/alkalinity:
pH = 5.5–6.5 for a 2% w/v aqueous dispersion of corn starch, at 25°C.
Density (bulk):
0.462 g/cm3 for corn starch.
Density (tapped):
0.658 g/cm3 for corn starch.
Flowability:
10.8–11.7 g/s for corn starch; 30% for corn starch (Carr compressibility
index). Corn starch is cohesive and has poor flow characteristics.
Gelatinization temperature:
73°C for corn starch; 72°C for potato starch; 63°C for wheat starch.
Moisture content:
All starches are hygroscopic and rapidly absorb atmospheric moisture.21,22
Approximate equilibrium moisture content values at 50% relative humidity are
11% for corn starch; 18% for potato starch; 14% for rice starch; and 13% for wheat
starch. Between 30% and 80% relative humidity, corn starch is the least
41
hygroscopic starch and potato starch is the most hygroscopic. Commercially
available grades of corn starch usually contain 10–14% water.
Regulatory Status
GRAS listed. Included in the FDA Inactive Ingredients Guide (buccal
tablets, oral capsules, powders, suspensions and tablets; topical preparations; and
vaginal tablets). Included in nonparenteral medicines licensed in the UK. Included
in the Canadian List of Acceptable Non-medicinal Ingredients.
POVIDONE
NONPROPRIETARY NAMES
• BP: Povidone
• JP: Povidone
• PhEur: Povidonum
• USP: Povidone
Synonyms
E1201; Kollidon; Plasdone; poly[1-(2-oxo-1-pyrrolidinyl)ethylene]; polyvidone;
polyvinylpyrrolidone; PVP; 1-vinyl-2-pyrrolidinone polymer.
Chemical Name and CAS Registry Number
1-Ethenyl-2-pyrrolidinone homopolymer [9003-39-8]
42
Empirical Formula and Molecular Weight
(C6H9NO)n 2500–3 000 000
Functional Category
Disintegrant; dissolution aid; suspending agent and tablet binder.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Although povidone is used in a variety of pharmaceutical formulations, it is
primarily used in solid-dosage forms. In tableting, povidone solutions are used as
binders in wet-granulation processes.2,3 Povidone is also added to powder blends
in the dry form and granulated in situ by the addition of water, alcohol, or
hydroalcoholic solutions. Povidone is used as a solubilizer in oral and parenteral
formulations and has been shown to enhance dissolution of poorly soluble drugs
from solid-dosage forms.4–6 Povidone solutions may also be used as coating
agents.
Povidone is additionally used as a suspending, stabilizing, or viscosity-
increasing agent in a number of topical and oral suspensions and solutions. The
solubility of a number of poorly soluble active drugs may be increased by mixing
with povidone.
Description
Povidone occurs as a fine, white to creamy-white colored, odorless or almost
odorless, hygroscopic powder. Povidones with K-values equal to or lower than 30
are manufactured by spray-drying and occur as spheres. Povidone K-90 and higher
K-value povidones are manufactured by drum drying and occur as plates.
43
TYPICAL PROPERTIES
Acidity/alkalinity:
pH = 3.0–7.0 (5% w/v aqueous solution).
Density (bulk):
0.29–0.39 g/cm3 for Plasdone.
Density (tapped):
0.39–0.54 g/cm3 for Plasdone.
Flowability:
• 20 g/s for povidone K-15;
• 16 g/s for povidone K-29/32.
Melting point:
softens at 150°C.
Moisture content:
Povidone is very hygroscopic, significant amounts of moisture being
absorbed at low relative humidities.
Solubility:
freely soluble in acids, chloroform, ethanol (95%), ketones, methanol, and water;
practically insoluble in ether, hydrocarbons, and mineral oil. In water, the
concentration of a solution is limited only by the viscosity of the resulting solution,
which is a function of the K-value.
44
Viscosity (dynamic):
The viscosity of aqueous povidone solutions depends on both the
concentration and the molecular weight of the polymer employed.
STABILITY AND STORAGE CONDITIONS
Povidone darkens to some extent on heating at 150°C, with a reduction in
aqueous solubility. It is stable to a short cycle of heat exposure around 110–
130°C; steam sterilization of an aqueous solution does not alter its properties.
Aqueous solutions are susceptible to mold growth and consequently require the
addition of suitable preservatives.
Povidone may be stored under ordinary conditions without undergoing
decomposition or degradation. However, since the powder is hygroscopic, it should
be stored in an airtight container in a cool, dry place.
Incompatibilities
Povidone is compatible in solution with a wide range of inorganic salts,
natural and synthetic resins, and other chemicals. It forms molecular adducts in
solution with sulfathiazole, sodium salicylate, salicylic acid, phenobarbital, tannin,
and other compounds. The efficacy of some preservatives, e.g. thimerosal, may be
adversely affected by the formation of complexes with povidone.
Regulatory Status
Accepted for use in Europe as a food additive. Included in the FDA Inactive
Ingredients Guide (IM and IV injections; ophthalmic preparations; oral capsules,
drops, granules, suspensions, and tablets; sublingual tablets; topical and vaginal
preparations). Included in nonparenteral medicines licensed in the UK. Included in
the Canadian List of Acceptable Non-medicinal Ingredients.
45
CROSPOVIDONE
NONPROPRIETARY NAMES
• BP: Crospovidone
• PhEur: Crospovidonum
• USPNF: Crospovidone
Synonyms
Crosslinked povidone; E1202; Kollidon CL; Kollidon CL-M; Polyplasdone
XL; Polyplasdone
Chemical Name and CAS Registry Number
1-Ethenyl-2-pyrrolidinone homopolymer [9003-39-8]
Empirical Formula and Molecular Weight
(C6H9NO)n >1 000 000
Functional Category
Tablet disintegrant.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Crospovidone is a water-insoluble tablet disintegrant and dissolution agent
used at 2–5% concentration in tablets prepared by direct-compression or wet- and
dry-granulation methods. It rapidly exhibits high capillary activity and pronounced
hydration capacity, with little tendency to form gels. Studies suggest that the
particle size of crospovidone strongly influences disintegration of analgesic tablets.
Larger particles provide a faster disintegration than smaller particles.
Crospovidone can also be used as a solubility enhancer.
46
With the technique of co-evaporation, crospovidone can be used to enhance the
solubility of poorly soluble drugs. The drug is adsorbed on to crospovidone in the
presence of a suitable solvent and the solvent is then evaporated. This technique
results in faster dissolution rate.
Description
Crospovidone is a white to creamy-white, finely divided, free-flowing,
practically tasteless, odorless or nearly odorless, hygroscopic powder.
TYPICAL PROPERTIES
Acidity/alkalinity:
pH = 5.0–8.0 (1% w/v aqueous slurry)
Density:
1.22 g/cm3
Loss on drying:
Less than 5%
Particle size distribution:
Less than 400 μm for Polyplasdone XL; less than 74 μm for Polyplasdone
XL-10.
Approximately 50% greater than 50 μm and maximum of 3% greater than 250 μm
in size for
Kollidon CL. Minimum of 90% of particles are below 15 μm for Kollidon CL-M.
Solubility:
Practically insoluble in water and most common organic solvents.
47
STABILITY AND STORAGE CONDITIONS
Since crospovidone is hygroscopic, it should be stored in an airtight
container in a cool, dry place.
Incompatibilities
Crospovidone is compatible with most organic and inorganic pharmaceutical
ingredients. When exposed to a high water level, crospovidone may form
molecular adducts with some materials; see Povidone.
Regulatory Status
Accepted for use as a food additive in Europe. Included in the FDA Inactive
Ingredients Guide (IM injections, oral capsules and tablets; topical, transdermal,
and vaginal preparations). Included in nonparenteral medicines licensed in the UK.
Included in the Canadian List of Acceptable Non-medicinal Ingredients.
LACTOSE
NONPROPRIETARY NAMES
• BP: Anhydrous lactose
• JP: Anhydrous lactose
• PhEur: Lactosum anhydricum
• USPNF: Anhydrous lactose
Synonyms
Anhydrous Lactose NF 60M; Anhydrous Lactose NF Direct Tableting;
Lactopress
48
Anhydrous; lactosum; lattioso; milk sugar; Pharmatose DCL 21; Pharmatose DCL
22;
saccharum lactis; Super-Tab Anhydrous.
Chemical Name and CAS Registry Number
O-β-D-galactopyranosyl-(1→4)-β-D-glucopyranose [63-42-3]
Empirical Formula and Molecular Weight
C12H22O11 342.30
Structural Formula
The PhEur 2005 describes anhydrous lactose as O-β-D-galactopyranosyl-
(1→4)-β-Dglucopyranose; or a mixture of O-β-D-galactopyranosyl-(1→4)-α-D-
glucopyranose and O-β- D-galactopyranosyl-(1→4)-β-D-glucopyranose. The
USPNF 23 describes anhydrous lactose as being primarily β-lactose or a mixture of
α- and β-lactose. The JP 2001 describes anhydrous lactose as β-lactose or a mixture
of β-lactose and α-lactose.
Functional Category
Binding agent; directly compressible tableting excipient; lyophilization aid;
tablet and capsule filler.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Anhydrous lactose is widely used in direct compression tableting
applications and as a tablet and capsule filler and binder. Anhydrous lactose can be
used with moisture-sensitive drugs due to its low moisture content.
49
Description
Lactose occurs as white to off-white crystalline particles or powder. Several
different brands of anhydrous lactose are commercially available which contain
anhydrous β-lactose and anhydrous α-lactose. Anhydrous lactose typically contains
70–80% anhydrous β-lactose and 20–30% anhydrous α-lactose.
TYPICAL PROPERTIES
Angle of repose:
39° for Pharmatose DCL 21 and 38° for Super-Tab Anhydrous.
Density :
1.589 g/cm3 for anhydrous β-lactose; 1.567 g/cm3 for Super-Tab
Anhydrous.
Melting point:
• 223.0°C for anhydrous α-lactose;
• 252.2°C for anhydrous β-lactose;
• 232.0°C (typical) for commercial anhydrous lactose.
Stability and Storage Conditions
Mold growth may occur under humid conditions (80% RH and above).
Lactose may develop a brown coloration on storage, the reaction being accelerated
by warm, damp conditions. At 80°C and 80% RH, tablets containing anhydrous
lactose have been shown to expand 1.2 times after one day.
Lactose anhydrous should be stored in a well-closed container in a cool, dry
place.
50
Incompatibilities
Lactose anhydrous is incompatible with strong oxidizers. When mixtures
containing a hydrophobic leukotriene antagonist and anhydrous lactose or lactose
monohydrate were stored for six weeks at 40°C and 75% RH, the mixture
containing anhydrous lactose showed greater moisture uptake and drug
degradation.
Studies have also shown that in blends of roxifiban acetate (DMP-754) and
lactose anhydrous, the presence of lactose anhydrous accelerated the hydrolysis of
the ester and amidine groups.
Regulatory Status
Included in the FDA Inactive Ingredients Guide (IM, IV, and SC injections;
oral capsules and tablets; inhalation preparations; rectal, transdermal, and vaginal
preparations). Included in nonparenteral and parenteral medicines licensed in the
UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
PROPYLENE GLYCOL
NONPROPRIETARY NAMES
• BP: Propylene glycol
• JP: Propylene glycol
• PhEur: Propylenglycolum
• USP: Propylene glycol
Synonyms
1,2-Dihydroxypropane; E1520; 2-hydroxypropanol; methyl ethylene glycol;
methyl glycol; propane-1,2-diol.
51
Chemical Name and CAS Registry Number
1,2-Propanediol [57-55-6]
(−)-1,2-Propanediol [4254-14-2]
(+)-1,2-Propanediol [4254-15-3]
Empirical Formula and Molecular Weight
C3H8O2 76.09
Functional Category
Antimicrobial preservative; disinfectant; humectant; plasticizer; solvent;
stabilizer for vitamins; water-miscible cosolvent.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Propylene glycol has become widely used as a solvent, extractant, and
preservative in a variety of parenteral and nonparenteral pharmaceutical
formulations. It is a better general solvent than glycerin and dissolves a wide
variety of materials, such as corticosteroids, phenols, sulfa drugs, barbiturates,
vitamins (A and D), most alkaloids, and many local anesthetics.
As an antiseptic it is similar to ethanol, and against molds it is similar to
glycerin and only slightly less effective than ethanol.
Propylene glycol is commonly used as a plasticizer in aqueous film-coating
formulations. Propylene glycol is also used in cosmetics and in the food industry
as a carrier for emulsifiers and as a vehicle for flavors in preference to ethanol,
since its lack of volatility provides a more uniform flavor.
52
TYPICAL PROPERTIES
Autoignition temperature:
371°C
Boiling point:
188°C
Density:
1.038 g/cm3 at 20°C
Solubility:
Miscible with acetone, chloroform, ethanol (95%), glycerin, and water;
soluble at 1 in 6 parts of ether; not miscible with light mineral oil or fixed oils, but
will dissolve some essential oils.
Viscosity (dynamic):
58.1 mPa s (58.1 cP) at 20°C
STABILITY AND STORAGE CONDITIONS
At cool temperatures, propylene glycol is stable in a well-closed container,
but at high temperatures, in the open, it tends to oxidize, giving rise to products
such as propionaldehyde, lactic acid, pyruvic acid, and acetic acid. Propylene
glycol is chemically stable when mixed with ethanol (95%), glycerin, or water;
aqueous solutions may be sterilized by autoclaving. Propylene glycol is
hygroscopic and should be stored in a well-closed container, protected from light,
in a cool, dry place.
Incompatibilities
Propylene glycol is incompatible with oxidizing reagents such as potassium
permanganate.
53
Method of Manufacture
Propylene is converted to chlorohydrin by chlorine water and hydrolyzed to
1,2-propylene oxide. With further hydrolysis, 1,2-propylene oxide is converted to
propylene glycol.
Regulatory Status
GRAS listed. Accepted for use as a food additive in Europe. Included in the
FDA Inactive Ingredients Guide (dental preparations, IM and IV injections,
inhalations, ophthalmic, oral, otic, percutaneous, rectal, topical, and vaginal
preparations). Included in nonparenteral and parenteral medicines licensed in the
UK. Included in the Canadian List of Acceptable Nonmedicinal Ingredients.
TITANIUM DIOXIDE
NONPROPRIETARY NAMES
• BP: Titanium dioxide, JP: Titanium oxide, PhEur: Titanii dioxidum, USP:
Titanium dioxide
Synonyms
Anatase titanium dioxide; brookite titanium dioxide; color index number
77891; E171;
Chemical Name and CAS Registry Number
Titanium oxide [13463-67-7]
Empirical Formula and Molecular Weight
TiO2 79.88
54
Structural Formula
TiO2
Functional Category
Coating agent; opacifier and pigment.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Titanium dioxide is widely used in confectionery, cosmetics, and foods, in
the plastics industry, and in topical and oral pharmaceutical formulations as a white
pigment. Owing to its high refractive index, titanium dioxide has light-scattering
properties that may be exploited in its use as a white pigment and opacifier. The
range of light that is scattered can be altered by varying the particle size of the
titanium dioxide powder. For example, titanium dioxide with an average particle
size of 230 nm scatters visible light, while titanium dioxide with an average
particle size of 60 nm scatters ultraviolet light and reflects visible light.
In pharmaceutical formulations, titanium dioxide is used as a white pigment
in film-coating suspensions, sugar-coated tablets, and gelatin capsules. Titanium
dioxide may also be admixed with other pigments.
Titanium dioxide is also used in dermatological preparations and cosmetics,
such as sunscreens.
Description
White, amorphous, odorless, and tasteless nonhygroscopic powder.
Although the average particle size of titanium dioxide powder is less than 1 μm,
commercial titanium dioxide generally occurs as aggregated particles of
approximately 100 μm diameter.
55
Titanium dioxide may occur in several different crystalline forms: rutile; anatase;
and brookite. Of these, rutile and anatase are the only forms of commercial
importance. Rutile is the more thermodynamically stable and is used more
frequently than the other crystalline forms.
Melting point:
1855°C
Moisture content:
0.44%
Particle size distribution:
Average particle size = 1.05 μm.5
Solubility:
Practically insoluble in dilute sulfuric acid, hydrochloric acid, nitric acid,
organic solvents, and water. Soluble in hydrofluoric acid and hot concentrated
sulfuric acid. Solubility depends on previous heat treatment; prolonged heating
produces a less-soluble material.
STABILITY AND STORAGE CONDITIONS
Titanium dioxide is extremely stable at high temperatures. This is due to the
strong bond between the tetravalent titanium ion and the bivalent oxygen ions.
However, titanium dioxide can lose small, unweighable amounts of oxygen by
interaction with radiant energy. This oxygen can easily recombine again as a part
of a reversible photochemical reaction, particularly if there is no oxidizable
material available. These small oxygen losses are important because they can cause
significant changes in the optical and electrical properties of the pigment.
56
Titanium dioxide should be stored in a well-closed container, protected from
light, in a cool, dry place.
Incompatibilities
Owing to a photocatalytic effect, titanium dioxide may interact with certain
active substances, e.g. famotidine. Studies have shown that titanium dioxide
monatonically degrades film mechanical properties and increases water vapor
permeability of polyvinyl alcohol coatings when used as an inert filler and
whitener.
Titanium dioxide has also been shown to induce photooxidation of
unsaturated lipids.
Safety
Titanium dioxide is widely used in foods and oral and topical
pharmaceutical formulations. It is generally regarded as an essentially nonirritant
and nontoxic excipient.
Regulatory Status
Accepted as a food additive in Europe. Included in the FDA Inactive
Ingredients Guide (dental paste; intrauterine suppositories; ophthalmic
preparations; oral capsules, suspensions, tablets; topical and transdermal
preparations). Included in nonparenteral medicines licensed in the UK. Included in
the Canadian List of Acceptable Non-medicinal Ingredients.
57
HYPROMELLOSE
NONPROPRIETARY NAMES
• BP: Hypromellose, JP: Hydroxypropylmethylcellulose, PhEur: Hypromellosum,
USP: Hypromellose
Synonyms
Benecel MHPC; E464; hydroxypropyl methylcellulose; HPMC; Methocel;
methylcellulose propylene glycol ether; methyl hydroxypropylcellulose; Metolose;
Tylopur.
Chemical Name and CAS Registry Number
Cellulose hydroxypropyl methyl ether [9004-65-3]
Empirical Formula and Molecular Weight
The PhEur 2005 describes hypromellose as a partly O-methylated and O-(2-
hydroxypropylated) cellulose. It is available in several grades that vary in viscosity
and extent of substitution. Grades may be distinguished by appending a number
indicative of the apparent viscosity, in mPa s, of a 2% w/w aqueous solution at
20°C. Hypromellose defined in the USP 28 specifies the substitution type by
appending a four-digit number to the nonproprietary name: e.g., hypromellose
1828. The first two digits refer to the approximate percentage content of the
methoxy group (OCH3). The second two digits refer to the approximate percentage
content of the hydroxypropoxy group (OCH2CH(OH)CH3), calculated on a dried
basis. It contains methoxy and hydroxypropoxy groups conforming to the limits for
the types of hypromellose stated in Table I. Molecular weight is approximately 10
58
000–1 500 000. The JP 2001 includes three separate monographs for
hypromellose: hydroxypropylmethylcellulose 2208, 2906, and 2910, respectively.
Functional Category
Coating agent; film-former; rate-controlling polymer for sustained release;
stabilizing agent; suspending agent; tablet binder; viscosity-increasing agent.
APPLICATIONS IN PHARMACEUTICAL FORMULATION OR
TECHNOLOGY
Hypromellose is widely used in oral, ophthalmic and topical pharmaceutical
formulations.
In oral products, hypromellose is primarily used as a tablet binder,1 in film-
coating,2–7 and as a matrix for use in extended-release tablet formulations.8–12
Concentrations between 2% and 5% w/w may be used as a binder in either wet- or
dry-granulation processes. High-viscosity grades may be used to retard the release
of drugs from a matrix at levels of 10–80% w/w in tablets and capsules.
Depending upon the viscosity grade, concentrations of 2–20% w/w are used
for film-forming solutions to film-coat tablets. Lower-viscosity grades are used in
aqueous film-coating solutions, while higher-viscosity grades are used with
organic solvents. Examples of filmcoating materials that are commercially
available include AnyCoat C, Spectracel, and Pharmacoat.
Hypromellose is also used as a suspending and thickening agent in topical
formulations.
Compared with methylcellulose, hypromellose produces aqueous solutions
of greater clarity, with fewer undispersed fibers present, and is therefore preferred
in formulations for ophthalmic use. Hypromellose at concentrations between 0.45–
59
1.0% w/w may be added as a thickening agent to vehicles for eye drops and
artificial tear solutions.
Hypromellose is also used as an emulsifier, suspending agent, and
stabilizing agent in topical gels and ointments. As a protective colloid, it can
prevent droplets and particles from coalescing or agglomerating, thus inhibiting the
formation of sediments.
In addition, hypromellose is used in the manufacture of capsules, as an
adhesive in plastic bandages, and as a wetting agent for hard contact lenses. It is
also widely used in cosmetics and food products.
Description
Hypromellose is an odorless and tasteless, white or creamy-white fibrous or
granular powder.
TYPICAL PROPERTIES
Acidity/alkalinity:
pH = 5.5–8.0 for a 1% w/w aqueous solution.
Ash:
1.5–3.0%, depending upon the grade and viscosity.
Density :
1.326 g/cm3
Melting point:
browns at 190–200°C; chars at 225–230°C. Glass transition temperature is
170–180°C.
60
Moisture content:
Hypromellose absorbs moisture from the atmosphere; the amount of water
absorbed depends upon the initial moisture content and the temperature and
relative humidity of the surrounding air.
Solubility:
Soluble in cold water, forming a viscous colloidal solution; practically
insoluble in chloroform, ethanol (95%), and ether, but soluble in mixtures of
ethanol and dichloromethane, mixtures of methanol and dichloromethane, and
mixtures of water and alcohol. Certain grades of hypromellose are soluble in
aqueous acetone solutions, mixtures of dichloromethane and propan-2-ol, and other
organic solvents
Specific gravity:
1.26
Viscosity :
A wide range of viscosity types are commercially available. Aqueous
solutions are most commonly prepared, although hypromellose may also be
dissolved in aqueous alcohols such as ethanol and propan-2-ol provided the alcohol
content is less than 50% w/w. Dichloromethane and ethanol mixtures may also be
used to prepare viscous hypromellose solutions. Solutions prepared using organic
solvents tend to be more viscous; increasing concentration also produces more
viscous solutions.
STABILITY AND STORAGE CONDITIONS
Hypromellose powder is a stable material, although it is hygroscopic after
drying. Solutions are stable at pH 3–11. Increasing temperature reduces the
viscosity of solutions. Hypromellose undergoes a reversible sol–gel transformation
upon heating and cooling, respectively. The gel point is 50–90°C, depending upon
the grade and concentration of material. Aqueous solutions are comparatively
61
enzyme-resistant, providing good viscosity stability during long-term storage.
However, aqueous solutions are liable to microbial spoilage and should be
preserved with an antimicrobial preservative: when hypromellose is used as a
viscosity-increasing agent in ophthalmic solutions, benzalkonium chloride is
commonly used as the preservative. Aqueous solutions may also be sterilized by
autoclaving; the coagulated polymer must be redispersed on cooling by shaking.
Hypromellose powder should be stored in a well-closed container, in a cool, dry
place.
Incompatibilities
Hypromellose is incompatible with some oxidizing agents. Since it is nonionic,
hypromellose will not complex with metallic salts or ionic organics to form
insoluble precipitates.
Regulatory Status
GRAS listed. Accepted for use as a food additive in Europe. Included in the
FDA Inactive Ingredients Guide (ophthalmic preparations; oral capsules,
suspensions, syrups, and tablets; topical and vaginal preparations). Included in
nonparenteral medicines licensed in the UK.
Included in the Canadian List of Acceptable Non-medicinal Ingredients.
62
4.0 MATERIALS AND METHODS
4.1 LIST OF EQUIPMENTS
S.No Equipments Name Make Specification/Capacity
1 Electromagnetic sieve
shakerElectro lab EMS-8
2 Fluid Bed Dryer Alliance 5.0kg/L
3 UV apparatus Shimadzu -
4 Rotary Tablet compression
machineCadmach 23 Station
5 Portable Stirrer Remi -
6 Electronic Balance Mettler 3.0Kg
7 Bulk density Apparatus Campbell electronics -
8 Humidity Chamber
(400C ± 20C/75% ±5%RH)Thermo Lab 200L
9 Monsanto Hardness Tester Tab-Machines -
10 Vernier Caliper (Thickness) Mitutoyo -
11 Moisture Balance Citizen -
12 Fribilator Electrolab -
13 Dissolution apparatus Lab India Disso 2000
14 HPLC Shimadzu -
15 Coating Pan 5 L
63
4.2 LIST OF INGREDIENTS
The following materials were obtained from the commercial source and used as
received.
S.No. INGREDIENTS NAME MANUFACTURER
1 Doxycycline Hyclate Husasdha Pharma
2 Microcrystalline Cellulose Vijlak Pharma
3 Lactose DMV International
4 Povidone Zhangiagang hope
chemical
5 Isopropyl Alcohol Shell Relene
6 Starch Maize Products
7 Croscarmellose Sodium Mingtai Chemicals
8 Talc Indian Chemicals
9 Magnesium Stearate Harihar Organics
10 Hypromellose 15 cps Shangdong Head Co.
Ltd
11 Propylene Glycol Manali Petro
Chemicals
12 Titanium Dioxide Merck
13 Quinoline Yellow Lake Roha Dye Chem
14 Methylene Chloride Chemplast Sanmar
64
4.3 SELECTION OF EXCIPIENTS
Excipients selection will be made based on the excipients used by the
marketed preparations available in regulated markets such as US, UK and
Germany. The inactive ingredients used in the formulation shall be retrived from
the literature through internet (rx list website for product from USA, emc website
for UK and vidal website for Germany). Based on the available excipients
preformulation study will be conducted to selected the final manufacturer / grade
of excipients.
The preformulation studies will be conducted by uniform mixing of drug and
other excipients in a specific ratio and subject them to stability study. The final
excipients will be selected based on stability observation and the performance of
these excipients in various trials.
65
4.4 EVALUATION OF MARKET SAMPLES
The fast moving brand is purchased from the market and is analysed for its
physical and chemical characteristics such as average weight, Description, DT,
Thickness, Diameter, Loss on drying, Assay, Dissolution, Packing details, Storage
conditions, Shelf life and Product details.
66
4.5 OUTLINE OF MANUFACTURING PROCEDURE AND OUTLINE
OF COATING PROCEDURE:
Sifting:
The weighed raw materials (Doxycycline Hyclate, Microcrystalline
cellulose, Lactose monohydrate, Povidone, Isopropyl Alcohol, Starch,
Crospovidone, Talc and Magnesium Stearate) are sifted through appropriate sieve.
Mixing:
Sifted raw materials are mixed using polybag together to get a uniform
mixture.
Compression:
The mixed blend in compressed into a tablet of average weight 300 mg using
D tooling in a 8 station compression machine. Lubricated granules are compressed
by using 9.1mm SC punches with average weight of 300mg. Then tablets physical
parameters are recorded.
Coating
The compressed bulk tablets are loaded into the R&D model 5L coating pan,
Non-aquous coating solution in prepared Hypromellose 15 cps, Propylene Glycol,
Titanium Dioxide, Talc, Quinoline Yellow Lake, Methylene Chloride and
Isopropyl alcohol are coated to get a weight said up to 2.3% w/w.
67
DIRECT COMPRESSION METHOD:
Sifting
Mixing
Compression
Coating
WET GRANULATION METHOD:
Sifting
Dry mixing
Binder preparation
Granulation
Drying
Sifting and Fine blending
Lubrication
Compression
Coating solution preparation
Coating
68
4.6 PRECOMPRESSION PARAMETER
Loss on drying
Bulk density
Tapped density
Compressibility index
Sieve analysis
4.6.1 LOSS ON DRYING
The prepared granules (5 gm) were taken and the moisture content is determined at
60oC using IR moisture balance.
4.6.2 BULK DENSITY
Quantity of granules sufficient to fill 50ml is taken in a 50ml measuring cyclinder
(having each 1ml reading). The weight of this granules is noted
Bulk density in calculated using
Bulk Density = Mass of Powder (g) .Volume of Powder (ml)
4.6.3 TAPPED DENSITY
After that the measuring cylinder is subjected to 50 tappings or until to get a
constant powder level on a smooth surface.
Tapped Density = Mass of Powder (g) .Volume of Power (ml)
After 50 taps.
69
4.6.4 COMPRESSIBILITY INDEX
Compressibility Index = Vo – Vf
Vo
Vo = Initial Volume
Vf = Final Volume
Compressibility Index (%) Flow Characters
≤ 10 Excellent
11 – 15 Good
16 – 20 Fair
21 – 25 Passable
26 – 31 Poor
32 – 37 Very Poor
> 38 Very Very Poor
4.6.5 SIEVE ANALYSIS
Weighed quantity of granules is loaded into the preweighed stacked sieves in the
electronic sieve shaker (Coarser sieve on top to fine sieve at bottom). The sieves are
clamped tightly and is subjected to electrical vibration after 5minutes vibration is
discontinued and the sieves are reweighed. The quantity of granules retained in the
respective sieve are noted down.
70
SIEVE NO.
TARE WEIGHT OF
SIEVES
WEIGHT OF GRANULES
AFTER 5MINUTES
QUANTITY OF GRANULES
RETAIN
CUMULATIVE GRANULES
RETAIN
20
30
40
50
60
100
120
4.7 POST COMPRESSION PARAMETER
Description
Thickness & diameter
Hardness
Friability
Disintegration test
In-vitro dissolution test
Assay
71
4.7.1 DESCRIPTION
The general appearance of a tablet, its visual identity and overall “elegance” is
essential for consumer acceptance. The color, shape, odor, surface texture and legibility
of any identifying marking are all noted for the tablet prepared.
THICKNESS AND DIAMETER
Thickness depends mainly upon die filling, physical properties of materials to be
compressed and compression force. The thickness and diameter were measured by using
vernier caliper.
4.7.2 WEIGHT VARIATION TEST
It is desirable that every individual tablet in a batch is uniform in weight and
variation it any is within permissible limits. Non uniformity in weights may lead to
variation in dosing. All finished batches of tablets should be sampled and tested for
weight uniformity.
20 tablets were weighed collectively and individually, from the collective weight,
average weight was calculated. Each tablet weight was compared with average weight to
ascertain whether it is within permissible limits or not. The tablets meet the B.P. test if
not more than 2 tablets are outside the percentage limit and if no tablets differs by more
than 2 times the percentage limit.
72
WEIGHT VARIATION TOLERANCES FOR UNCOATED TABLETS
WEIGHT VARIATION SPECIFICATION
4.7.3 HARDNESS
It is defined as force required breaking a tablet in a diametric compression test. To
perform this test Monsanto test is used. It consists of a barrel containing a compressible
spring held between two plungers. The tablet is placed in contact with the lower plunger
and a zero reading is taken. The upper plunger is then forced against a spring by turning a
threaded blot until the tablet fractures. As the spring is compressed a pointer rides along a
gauge in the barrel to indicate the force. The force of fracture is recorded. This parameter
is important to know that the tablet has sufficient strength to withstand mechanical
shocks of handling in manufacturing, packaging and shipping.
4.7.4 FRIABILITY
It is intended to determine the loss of mass under defined conditions. The friability
of uncoated tablets is determined by using roche friabilator in the laboratory. In a wider
Average weight
Of Tablet (mg)
Maximum percentage
Difference Allowed
<80 10
80-250 7.5
>250 5
73
sense chipping and fragmentation can also be included in friability. It reflects cohesion of
tablet ingredients.
The Roche friability test apparatus consists of acicular plastic chamber, divided
into 2 compartments. The chamber was rotated at a speed of 25 rpm and the tablets were
dropped to a 15cm distance. Reweighed tablets were placed in the apparatus which was
given 100 revolutions after which tablets were weighed once again. The difference
between the two weights represents friability. The weight loss should not be more than
1%.
Then the tablets are dusted and reweighed and the friability percentage is calculated
using the formula.
Wo – W
F = (---------------- ) x 100
Wo
Wo – Weight of the 20 tablets before friability
W - Weight of the 20 tablets after friability
Conventional compressed tablets that lose less than 0.5 to 1.0% of their weight are
generally considered acceptable.
When capping is observed on friability testing, the tablet should not be considered
for commercial use, regardless of the percentage of loss seen.
74
4.7.5 DISINTEGRATION TEST
The USP device to test disintegration uses two glass tubes that are 3 inches long,
open at the top, and held against a co-mesh screen at the bottom end of the basket rack
assembly to text for disintegration time, one tablet is placed in each tube, and the basket
rack is positioned in a 1 litre beaker of water, stimulated gastric fluid, or stimulated
intestinal fluid, at 37oC ± 2oC such that the tablets remain 2.5cm below the surface of the
liquid on their upward movement and descend not closer than 2.5cm from the bottom of
the beaker. A standard motor – driver device is used to move the basket assembly
containing the tablets up and down through a distance of 5 to 6 cm at a frequency of 28 to
32 cycles per mins. Perforated plastic disc may also be used in the test. These are placed
on top of the tablets and impart an abrasive action to the all particles must pass through
the 10-mesh screen in the time specified.
4.7.6 IN-VITRO DISSOLUTION TEST
Dissolution Parameters:
Medium : Water 900ml
Apparatus : II (paddle)
RPM : 75
Time : 90 minutes
Bottom to Paddle Length : 4.5 0.5 cm
75
STANDARD PREPARATION:
Weigh accurately about 100mg of Doxycycline Hyclate WS in 100ml volumetric
flask, dissolve and make up the volume with water. Pipette out 10ml of the above
solution and dilute to 100ml with water. Further dilute 10ml of the solution to 100ml
with water.
SAMPLE PREPARATION:
Filter the sample from each vessel and 10ml of the filtrate to 100ml with water.
PROCEDURE:
Measure the absorbance of the standard and sample solution at maximum at 276nm
using water as blank. Calculated the content of Doxycycline.
CALCULATION:
Sample Abs X Std. Wt X 10 X 10 X 900 X 100 X Purity of Std X 100 X 0.87 Std. Abs X 100 X 100 X 100 X Label claim X 10 X 100
= % of Doxycycline / tablet
Dissolution Acceptance Criteria
Stage Number of Stages Acceptance Criteria
S1 6 Each Unit is NLT Q +5%
S2 6
Average of 12 Unit (S1 + S2) is equal to
greater than to Q and no unit is less than
Q-15%
S3 12Average of 24 Unit (S1+S2+S3) is equal to
greater than to Q
76
4.7.7 ASSAY
STANDARD PREPARATION:
Weight accurately about 100mg of Doxycycline Hyclate WS in 100ml
volumetric flask, dissolve and make up the volume with water. Pipette out 10ml of
the above solution and dilute to 100ml with water. Further dilute 10ml of the
solution to 50ml with water.
SAMPLE PREPARATION:
Weigh and finely powder not less than 20 tablets. Transfer an accurately
weighed portion of the powder, equivalent to about 100mg of Doxycycline, to a
100ml volumetric flask, add about75ml of water, sonicate for 5 minutes, shake for
15 minutes, dilute with water to volume, and filter. Pipette out 10ml of the above
solution to 100ml volumetric flask and make up the volume with water. Further
dilute 10ml of the solution to 50ml with water.
PROCEDURE:
Measure the absorbance of the standard and sample solutions at maximum at
276nm using water as a blank. Calculate the content of Doxycycline.
CALCULATION:
Sample Abs X Std. Wt X 10 X 10 X 100 X 100 X 50 X Purity of Std X 100 X Avg Wt of Tablet X 0.87 Std. Abs X 100 X 100X100X 50 X Sample Wt X 10 X 10 X 100 X Label claim
= % of Doxycycline / tablet
77
5.0 RESULTS AND DISCUSSION
5.1 MANUFACTURING OF TRIALS
Trial-I
Direct compression was tried, direct compressible microcrystalline cellulose,
croscarmellose sodium, starch, titanium dioxide, and talc are mixed with
Doxycycline Hyclate for 5minutes. Talc and Magnesium Stearate are added to the
same and mixed for another 2minutes. Sticking was observed.
Trial-II
To avoid sticking, granulation method is adopted in this trial. Half of
microcrystalline cellulose is replaced with lactose anhydrous. Sodium starch
glycollate is also included as a disintegrator. In this trial sticking problem was
rectified. Initial tablet parameters were satisfactory.
Trial-III
Ingredients and granulation are almost similar to Trial-II. Povidone is added
to improve hardness. The tablets were coated with optimized coating formula.
This batch is placed in a PVC by aluminium pouch and was subjected to stability
study. The tablets develop dark spots on stability.
78
Trial-IV
Due to dark spots formation of Trial-III, croscarmellose sodium and sodium
starch glycollate are removed and instead crospovidone was used as a disintegrant.
Microcrystalline cellulose alone is used as a diluent. Though the tablet
characteristics are satisfactory. Thickness is found to be higher, which may not be
packed with the existing packaging change parts.
Trial-V
Diluents and lubricants are similar to Trial-III. Crospovidone was used as a
disintegrator instead of croscarmellose sodium and sodium starch glycollate.
Tablets parameters were found to be satisfactory. This batch is placed in a PVC by
aluminium pouch and was subjected to stability study. The tablets develop dark
spots on stability.
79
5.2 EVALUATION OF MARKET SAMPLE
Description : Yellow coloured, round, biconvex, film
coated tablets with 100 on one side and
DOXT on other side.
Average weight (mg) : 295mg
DT : 4 – 5 Minutes
Thickness : 4.35 – 4.50 mm
Diameter : 9.15mm (with film coating)
Loss On Drying : 2.49% w/w
Assay : 98.58%
Dissolution : 88.95 at 90 minutes
Packing details : 10 tablets packed in a 0.04mm
Alu/Alu strip.
Storage conditions : Store below 25C, protect from light
& moisture.
Shelf life : 36 months
80
PRODUCT DETAILS
Brand name & Strength : DOXT 100 Tablets
Batch no : D80090
Manufactured by : Dr.Reddy’s Laboratories Ltd., Yanam
Inactive Ingredients : Lake of Quinoline Yellow WS and
Titanium dioxide IP
81
5.3 INCOMPATIBILITY STUDIES
Sl. No.
DRUG + EXCIPIENTS RATIO RT 40C 50C
1 Lactose monohydrate 1:1 No change in colour No change in colour No change in colour
2 Lactose anhydrous 1:1 No change in colour No change in colour No change in colour
3 Crospovidone 1:1 No change in colour No change in colour No change in colour
4 Titanium dioxide 1:20 No change in colour No change in colour No change in colour
5 Starch 1:1 No change in colour No change in colour No change in colour
6 Talc 1:20 No change in colour No change in colour No change in colour
7 Magnesium Stearate 1:20 No change in colour No change in colour No change in colour
8 HPMC 15 cps 1:20 No change in colour No change in colour No change in colour
9 Sodium Starch Glycolate (1) 1:1 No change in colour No change in colour No change in colour
10 Sodium Starch Glycolate (2) 1:1 No change in colour Change in colour (Black spots)
No change in colour
11 Povidone K30 1:10 No change in colour No change in colour No change in colour
12 Microcrystallinecellulose 1:1 No change in colour No change in colour No change in colour
82
5.3 INCOMPATIBILITY STUDY
Sl.
No.
DOXYCYCLINE HCLATE
+ EXCIPIENTSRATIO RT 40C 50C
1 DOXYCYCLINE HYCLATE
+ Hypromellose 15 cps
(Source-1)
1:10 No change in colour No change in colour No change in
colour
2 DOXYCYCLINE HYCLATE
+ Hypromellose 15 cps
(Source-2)
1:10 No change in colour No change in colour No change in
colour
3 DOXYCYCLINE HYCLATE
+ HPC
1:10 No change in colour No change in colour No change in
colour
83
5.4 FORMULATION OF DOXYCYCLINE HYCLATE TABLETS
SL. NO.
INGREDIENTS TRIAL IQty/TAB (mg)
TRIAL IQty/500Tab (g)
TRIAL IIQty/TAB (mg)
TRIAL IIQty/500Tab (g)
1 Doxycycline Hyclate 115.40 57.70 115.40 57.70
2 Microcrystalline cellulose (DC 102 grade)
142.10 71.05 64.00 32.00
3 Starch 15.00 7.50 9.60 4.80
4 Colloidal silicon dioxide 4.50 2.25 - -
5 Croscarmellose Sodium 15.00 7.50 15.00 7.50
6 Talc 6.00 3.00 6.00 3.00
7 Magnesium Stearate 4.50 2.25 6.00 3.00
8 Lactose Anhydrous (Pharmatose DC 121)
- - 64.00 32.00
9 Sodium Starch Glycolate - - 20.00 10.00
10 Isopropyl Alcohol - - - 35 ml
11 TOTAL 302.50 - 300.00
RAMARKS: Sticking is observed Sticking is rectified
84
5.4 FORMULATION OF DOXYCYCLINE HYCLATE TABLETS
SL. NO.
INGREDIENTS TRIAL IIIQty/TAB (mg)
TRIAL IIIQty/500Tab (g)
TRIAL IVQty/TAB (mg)
TRIAL IVQty/500Tab (g)
1 Doxycycline Hyclate 119.00 595.00 127 63.52 Microcrystalline cellulose
(DC 102 grade)62.00 310.00
3 Lactose Anhydrous 62.00 90.004 Sodium Starch Glycolate 18.00 90.005 Povidone 2.00 10.006 Isopropyl Alcohol 400 ml 40 ml7 Starch 10.00 50.008 Croscarmellose Sodium 15.00 75.009 Talc 6.00 30.00 3.00 1.5010 Magnesium Stearate 6.00 30.00 3.00 1.5011 Microcrystalline cellulose
(DC 112 grade)- 147.50 73.75
12 Aerosil - 4.50 2.2513 Crospovidone - 15.00 7.5014 TOTAL 300.00 300.00
COATING FORMULA:1 Hypromellose 15 cps 6.20 24.802 Propylene Glycol 1.20 4.803 Titanium Dioxide 0.20 0.804 Talc 0.20 0.805 Quinoline Yellow Lake 0.20 0.806 Methylene Chloride 385 ml7 Isopropyl Alcohol 256 ml
85
5.4 FORMULATION OF DOXYCYCLINE HYCLATE TABLETS
SL. NO.
INGREDIENTS TRIAL VQty/TAB (mg)
TRIAL VQty/1000Tab (g)
1 Doxycycline Hyclate 127.00 127.002 Microcrystalline cellulose 68.00 68.003 Lactose monohydrate 62.00 62.004 Povidone 3.00 3.005 Isopropyl Alcohol 80 ml6 Starch 10.00 10.007 Crospovidone 18.00 18.008 Talc 6.00 6.009 Magnesium Stearate 6.00 6.00
TOTAL 300COATING FORMULA:
1 Hypromellose 15 cps 6.50 6.502 Propylene Glycol 1.40 1.403 Titanium Dioxide 0.20 0.204 Talc 0.20 0.205 Quinoline Yellow Lake 0.20 0.206 Methylene Chloride 130 ml7 Isopropyl Alcohol 86 ml
86
5.5 EVALUATION OF DOXYCYCLINE HYCLATE TABLETS
TRIAL-I TRIAL-II TRIAL-III TRIAL-IV TRIAL-V
Average Weight 299 299 300.1 300 299.8
Thickness (mm) 4.55 – 4.60 4.15 – 4.22 4.25 – 4.35 4.8 – 4.9 4.36 – 4.44
Hardness Test (kg/cm2) 5 – 6 3 – 4 4 – 5 4 – 5 4 – 5
Friability 0.1 0.26 0.16 0.1 0.17
D.T. with Disc (min) 4 – 5 4 – 5 3 – 4 1 – 2 4 – 5
87
5.5 EVALUATION OF DOXYCYCLINE HYCLATE GRANULES
TRIAL-I TRIAL-II TRIAL-III TRIAL-IV TRIAL-V
Bulk Density 0.334 0.322 0.302 0.412 0.404
Tapped Density 0.395 0.388 0.364 0.496 0.481
Compressibility Index 15.44 17.44 17.03 15.60 15.90
Sieve Analysis
(Cumulative Retained)
-- -- -- --
40# 8.4%
60# 27.3%
80# 31.6%
100# 32.7%
88
5.6 COMPARATIVE DISSOLUTION STUDY FOR DOXYCYCLINE HYCLATE TABLETS
NO. OF
BASKET
DOXIT TABLET (BRAND) # D
80292TRIAL-II TRIAL-III TRIAL-IV TRIAL-V
15 Min. %
Release
87.53 42.19 87.27 98.08 100.37
30 Min. %
Release
89.61 79.64 94.72 98.38 102.90
45 Min. %
Release
91.02 89.72 95.36 101.18 103.94
60 Min. %
Release
91.41 91.08 96.73 103.77 106.04
90 Min. %
Release
91.95 98.01 97.25 104.18 108.23
89
5.7 STABILITY STUDY
PARAMETERS
40C / 75% RH 30C / 65% RH
Initial 1 Month 2 Month 2 Month
Description Yellow coloured, slightly biconvex, film coated tablets
Yellow coloured, slightly biconvex, film coated tablets
Yellow coloured, slightly biconvex, film coated tablets
Yellow coloured, slightly biconvex, film coated tablets
Water Content 2.56 2.61 2.94 2.51
D.T. 4 – 5 minutes 4 – 5 minutes 4 – 6 minutes 4 – 5 minutes
Dissolution 105.07 103.93 103.06 104.68
Assay 111.13 110.34 110.10 111.26
90
6.0 SUMMARY AND CONCLUSION
The proposed project “formulation and evaluation of Doxycycline
Hyclate tablets” is carried out at Fourrts (India) Laboratories Pvt. Ltd.,
located at Vandalur Road, Kanchipuram District – 603 103. The Corporate
Office is at Okkiyam Thoraipakkam, Chennai – 96.
The project is aimed to develop the formulation of Doxycycline
Hyclate tablets.
Chapter-1 deals with Introduction of the formulation of tablets, film coating
and ICH guidelines on stability study.
Chapter-2 deals with Objective of the work with Plan of work.
Chapter-3 deals with Drug Specific Review with Literature Review and
Excipients Profile.
Chapter-4 provides information regarding Materials and Methods.
Precompression and Post compression parameters.
Chapter-5 provides information regarding formulation and evaluation of
Doxycycline Hyclate tablets.
Through this study a stable formulation of Doxycycline Hyclate
tablets is successfully developed. The stability results reveal that the
developed product is stable. The final formula obeys USP monographs for
Doxycycline Hyclate tablets. In-vitro dissolution study shows the
formulation is comparable with marketed product.
91
7.0 BIBLIOGRAPHY
92