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Identification of Irradiated Potatoes Using Impedance
SURF Presentation by Kitty Monn
FOODBORNE DISEASES KILL THOUSANDS
25% OF WORLD FOOD SUPPLY DESTROYED
SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
What Is Food Irradiation?
Food irradiation is the process of exposing food, either packaged or in
bulk,
to carefully controlled amounts of ionizing radiation
for a specific time to achieve… certain desirable
objectives….
Ionizing Radiation-x-rays, alpha, beta, and gamma rays which
cause whatever material they strike to produce ions
(short wavelength…high energy)
SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
BENEFITS OF FOOD IRRADIATION LOW DOSE (up to 1 kGY)
(FDA approved for grain, fruits, vegetables, and pork)
Inhibits growth of sprouts on potatoes, onions, and garlic.
Slows ripening process, keeping fruits and vegetables from spoiling by a few days (e.g. mushrooms) to a few weeks (strawberries).
Kills insects found in wheat, flour, fruits, and vegetables.
Eliminates parasites such as trichinosis -causing parasites in pork.
BENEFITS OF FOOD IRRADIATION
MEDIUM DOSE (1-10 kGy) (FDA approved for poultry)
Extends shelf-life of fresh fish, strawberries, etc.
Reduces or eliminates spoilage and pathogenic microorganisms and parasites like salmonella.
Inhibits mold on fruits. Improves some technological
properties.
BENEFITS OF FOOD IRRADIATIONHIGH DOSE (10-50 kGy) (FDA approved for spices)
Sterilizes food for hospital diets of those with immune system disorders.
SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
Safety Issues for the Consumer
Radioactivity? Chemical changes? Nutritional qualities? Microbiological mutations? Genetic changes? Effect on food additives? Packaging?
Need for Detection Method
international food trade assure compliance with regulations
-enforcement of labeling-control where prohibited
consumer confidence
-protect freedom of information and choice
-protection from fraud
Types of Detection Methods
Chemical Biological Physical
Status of Physical Methods
Applications (Physical Methods)
Impedance -potatoes
Viscosity -pepper
Chemiluminescence -spices, herbs -dry vegetables
Thermoluminescence -spices, herbs (minerals) -fruits, veggies (minerals) -shellfish
EPR -meat, poultry, fish -nuts, dry fruits/veggies -fresh fruits -shellfish -whole eggs
IS THERE A SIGNIFICANT
DIFFERENCE ?
IS IMPEDANCE RATIO A RELIABLE INDICATOR?
Requirements of a Detection Method
Discrimination distinct and separable radiation-induced response
Specificity response not induced by other processing
Robustness insensitive or predictable response
Reliability
Stability
Confidence
Practicability rapid, simple, low cost wide applicability
Dose-dependence (quantification) ideal, not required