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COLD PLASMA TECHNOLOGY Novel Technology for Food Processing and Shelf Life Extension

KANKYO GROUP OF COMPANIES | www.kankyo.global | [email protected]

Water & Wastewater Treatment | Bioremediation | Waste To Energy | Air Pollution | Solid Waste Treatment

The food industry continually seeks innovative technologies and approaches to improve both

food production and processing methods.

Cold plasma proving to be hottest new food safety treatment. Cold Plasma Technology is a novel, non thermal food processing technology that uses energetic and reactive gases to inactivate contaminating microbes in food products ( E.g.. meat, poultry, etc.,)

COLD PLASMA TECHNOLOGY



WHAT IS PLASMA?

Plasma is a fourth state of matter. Man made plasma produced by plasma torches using electricity as a heating source and air as ionized gas.

WHAT IS PLASMA GASIFICATION ?

Plasma gasification is a process which converts organic matter into synthetic gas, electricity, and slag using plasma. A plasma torch powered by an electric arc, is used to ionize gas and catalyze organic matter into synthetic gas and solid waste (slag).

PLASMA 4th State of Matter

Classification (Types of Plasma)

TEMPERATURE

Low pressure Atmospheric pressure High pressure

Thermal plasma Hot Plasma Non Thermal plasma Cold Plasma

MODE

Microwave Gliding arc Corona Dielectric barrier

discharge

PRESSURE

Ultrasound :

Energy derived from sound waves

Irradiation:

Energy derived from ionizing radiations

Cold Plasma Technique:

Energy derived from plasma

FOOD PROCESSING TECHNIQUES




Cold plasma can be used for decontamination of products where micro-organisms are externally located. Unlike light (e.g. ultraviolet light decontamination), plasma flows around objects which means ―shadow effects do not occur ensuring all parts of a product are treated.

For products such as cut vegetables and fresh meat, there is no mild surface decontamination technology available currently; cold plasma could be used for this purpose.

Cold plasma could also be used to disinfect surfaces before packaging or included as part of the packaging process.

Energy consumption would be similar to existing UV-C systems and the treatment of foods would be highly cost-effective; the electronics and lifetime of plasma technologies are comparable to UV-C systems even with the additional need for a carrier gas

Cold plasma is attracting a lot of attention from the food industry.

Described as a “purple blow torch” by food safety scientists, cold plasma treatment can kill 99.9 percent of norovirus on blueberries without damaging the delicate fruit, giving a food safety boost to the so-called superfood.

Ref: https://www.foodsafetynews.com/2016/12/cold-plasma-proving-to-be-hottest-new-food-safety-treatment/



Relies on gas discharge technology – an effective, economical, environmentally safe method for critical

cleaning.

The resulting surface is ultra-clean/sterilised. The plasma activated atoms and ions cause molecular

„sandblasting‟ and can break down organic contaminants.

Cold plasma can be used for decontamination of products where micro-organisms are externally

located.

Unlike light ( UV decontamination), plasma flows around objects, which means „Shadows Effects‟ do

not occur ensuring all parts of a product are treated.

COLD PLASMA TECHNOLOGY IN FOODS

For products such as cut vegetables and fresh meat, there is

no mild surface decontamination technology available

currently, cold plasma could be used for this purpose.

Can also be used to disinfect surfaces before packaging or

included as packaging process



Illustration – Sterilization capability of Cold plasma E.coli – inoculated in to 3 Petri dishes. One dish was left as a control with no plasma exposure, another was exposed

for 30s of plasma treatment, and a third was exposed for 120 seconds.

The bacterial kill zone was progressively higher with longer

plasma exposure

MECHANISM OF MICROBIAL INACTIVATION BY COLD PLASMA


Plasma has no effect on the color, taste, appearance or materials contained in agricultural products, and only the outer shell makes these products completely free of any bacteria. With just a few seconds, the plasma can do all of these activities without the slightest negative effect, and it's like a magic



APPLICATIONS

DISINFECTION OF PACKAGING MATERIALS

Cold plasma can be used to inactivate vegetative micro-organisms and spores on packaging materials.

Especially for temperature sensitive products, this can have a clear advantage compared to heat treatments.

Plasma can also reduce the amount of water used for disinfection of packaging materials.

As cold plasma is a gas, irregularly shaped packages such as bottles can be effectively treated, contrary to technologies such as UV or pulsed light where shadowing occurs.


DISINFECTION OF FOOD PRODUCTS

Micro-organisms are located at the surface of a food product, cold plasmas can be used for inactivation of both vegetative cells and spores.

Treatment is done at low temperature, the effects on food quality and appearance of the product are minimal.




Purple blow torches require only one-fifth the power

1/5th Power Required

Inactivate potential spoilage microorganisms Kills pathogens such as Salmonella and E. coli Inactivate endogenous enzymes which are

responsible for browning reactions Depending on the plasma type, it is possible to

inactivate all types of pathogens

Inactivate / Kill

Used to alter the germination rate of seeds No cross contamination of bacteria from one

fruit to another

Germination of Seeds

They do not require on-site storage of supply chemicals or large volumes of processing water, either for implementation or in post-treatment

rinsing

Environmentally friendly and sustainable

Extend shelf life by slowing spoilage rates Extend shelf life by 3 times Useful for microbial inactivation while maintaining

quality of fresh produce Novel, Ultra-fast sterilization/preservation process

(sterilization takes only few minutes) Surface treatment process, doesn’t affect nutrients

within the food Process operates at ambient temperatures (ideal for

thermolabile products)

Shelf Life

Low running cost (cost of natural gases and electricity)

Low Operating Cost

It is an eco-friendly process which is used in the preservation of food and other potential applications as an alternative to common techniques.

ADVANTAGES

ADVANTAGES



COLD PLASMA USED TO KILL BACTERIA ON RAW CHICKEN

Common pathogen – Unprocessed meat – 70% Salmonella Plasma Torch - Applied for 180s, Plasma eliminated or subsequently

reduced low levels of bacteria from both skinless chicken and chicken skin itself.


BACTERIA‐FREE EGGS WITH PLASMA TECHNOLOGY

Plasma is used as a method for killing Salmonella on egg shells Maximum reduction of 2.2–2.5 and 4.5 log CFU/eggshell in Salmonella

enteritidis levels following a 90 min of treatment at 35 and 65% RH respectively

Salmonella typhimurium, with an overall reduction of 3.5 log CFU/eggshell, after 90-min treatment.

“By using plasma treatment, we have succeeded in removing 99.5 per cent of all bacteria on the egg shell but because this is a gentle method, the egg yolk and white are unaffected."



Treating with plasma for 15 min can achieve 2.72, 1.76 and 0.94 log reductions of S. Typhimurium on lettuce, strawberry and potato

respectively

The efficiency of microbial inactivation depends upon the surface of treating produce, plasma device, gas composition, and mode of

exposure

Produces like potatoes, strawberries took more time for complete destruction of microbes due to grooves and uneven surfaces

TREATMENT

Recent Studies COLD PLASMA TECHNOLOGY

STRAWBERRIES

Decrease in total mesophilic count was 12–85 %, yeast and mould count by

44– 95 % in cold plasma treated strawberries

RAW MILK

Treated for destruction of E. coli using low temperature plasma by Gurol et al. They observed 54 % reduction of E.coli after the treatment of 3 min.

Nuts (pea nuts, hazel nuts and pistachio)

Application of air plasma and SF6 on nuts (pea nuts, hazel nuts and

pistachio) found that 50 % reduction in total aflatoxins using air plasma and 20

% reduction using SF6

Germination rate of safflower seeds

Suitable for surface modification of seeds due to high ion energy particles causing etching of seed coat leading to increase in germination rate of seeds

by 50 % after the treatment



Cold plasma is used in decontamination of packing material externally where chance of shadow effect is negligible as plasma flows all round the surface

Low temperature gas plasma sterilization allows fast and safe sterilization of packaging materials such as plastic bottles, lids and films without adversely affecting the

properties of the material or leaving any residues. Cold plasma can be used for sterilization of heat sensitive packing materials like polythene ethylene and

polycarbonate as the temperature is low

Surfaces of polymers particularly for edible packaging films nature of surface should be more hydrophobic with lower surface energies

EFFECT ON PACKAGING MATERIAL

Recent Studies COLD PLASMA TECHNOLOGY




Shelf Life Extension by 4 weeks

You can see the difference between the two examples. Plasma is only applied for 20 seconds, and samples are

shown at room temperature after 2 months



COLD PLASMA TECHNOLOGY MODELS



There is an urgent need for regulation of safety of foods by effectively sanitizing without compromising food quality.

This has led to an increased interest in cold plasma processing for meat, poultry, and dairy products.

Cold Plasma is now being investigated for application to foods as a sanitizing and/or conditioning step.

The atmospheric cold plasma, by far, is one of the newest technologies used in food industry for microbial inactivation.

CONCLUSION

Cold plasma is an emerging non-thermal technology that offers the advantage of being chemical- and water-free, in addition to being able to operate openly and continuously at atmospheric pressure

We Design For The Future



KANKYO GROUP OF COMPANIES is an established waste management solution provider worldwide for Water & Wastewater Treatment, Bioremediation, Waste to Energy, Air Pollution Control and Solid Waste Management. With our vast experience in handling different types of waste, we wish to introduce KANKYO as the leading solution provider for waste management

VISION

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MISSION

Our mission is to make the world cleaner and more sustainable by creating valuable energy and resources from local, renewable waste. Our goal is to help our customers reduce disposal costs and become leaders in sustainability by delivering reliable sustainable solutions

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COLD PLASMA TECHNOLOGY - kankyo.globalkankyo.global/Cold_Plasma_Technology.pdf · for 30s of plasma treatment, and a third was exposed for 120 seconds. ... properties of the material