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Identification of Irradiated Potatoes Using Impedance
SURF Presentation by Kitty Monn
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FOODBORNE DISEASES KILL THOUSANDS
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25% OF WORLD FOOD SUPPLY DESTROYED
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SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
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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….
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Ionizing Radiation-x-rays, alpha, beta, and gamma rays which
cause whatever material they strike to produce ions
(short wavelength…high energy)
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SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
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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.
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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.
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BENEFITS OF FOOD IRRADIATIONHIGH DOSE (10-50 kGy) (FDA approved for spices)
Sterilizes food for hospital diets of those with immune system disorders.
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SOLUTION:
What is food irradiation? What are its benefits? Is it safe? Are there ways to detect whether
food has been irradiated?
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Safety Issues for the Consumer
Radioactivity? Chemical changes? Nutritional qualities? Microbiological mutations? Genetic changes? Effect on food additives? Packaging?
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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
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Types of Detection Methods
Chemical Biological Physical
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Status of Physical Methods
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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
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IS THERE A SIGNIFICANT
DIFFERENCE ?
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IS IMPEDANCE RATIO A RELIABLE INDICATOR?
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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
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