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Fun Facts About Food Irradiation

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Fun Facts About. Food Irradiation. A presentation of the. Why do we preserve food? ... Delay of ripening for strawberries, mangoes, bananas, tomatoes, etc. ... – PowerPoint PPT presentation

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Title: Fun Facts About Food Irradiation


1
Fun Facts About Food Irradiation
  • A presentation of the

2
Why do we preserve food?
  • Protect people from microorganisms, parasites,
    and other pests
  • Extend shelf-life, improve long-term quality
  • Make desirable alterations to food properties

3
History of Food Preservation
Oldest Methods - Drying - Fermenting -
Salting - Smoking
Newer Methods - Freezing - Canning -
Refrigeration - Preservatives - Pesticides
Newest Method Irradiation
4
What is food irradiation?
  • Treatment of foods by subjecting them to ionizing
    radiation
  • Does not and cannot make foods radioactive

5
Ionizing Radiation
  • Radiation that has the ability to produce ions -
    electrically charged particles
  • Examples alpha particle, beta particle, high
    energy electron, gamma ray, and x-ray

6
Nonionizing Radiation
  • Does not have sufficient energy to create ions -
    instead tends to excite molecules without
    removing electrons
  • Examples visible light, television waves, radio
    waves, and microwaves

7
(No Transcript)
8
Sources of Ionizing Radiation
  • Power plants
  • Fertilizers
  • Smoke detectors
  • Accelerators
  • Cosmic Radiation (the sun)
  • Medical procedures
  • Radon and other terrestrial sources
  • Nuclear weapons fallout

9
Food Irradiator Sources
  • Cobalt-60 and Cesium-137
  • Emit gamma rays
  • Sealed in container - never touches food
  • Can be recycled
  • Machine generated beta or x-rays
  • Produces no waste outside of the machine used to
    produce the radiation

10
Irradiation Processes
  • Sterilization
  • Pasteurization
  • Disinfestation
  • Sprout Inhibition
  • Delay of Ripening
  • Physical Improvements

11
Irradiation Sterilization
  • Very high dose used to kill all organisms
  • Sterilization of 50 disposable medical
    instruments
  • Food sterilization - NASA, military, transplant
    patients

12
Irradiation Pasteurization
  • Reduces remaining number of living organisms
  • Prevent growth of mold
  • Kill bacteria and parasites

13
Irradiation Disinfestation
  • Kills insects and parasites in grains and other
    stored foods
  • Fewer chemical residues on fruits and vegetables
  • Does not prevent against re-infestation

14
Physical Improvements
  • Inhibit sprouting of potatoes, onions, and garlic
  • Delay of ripening for strawberries, mangoes,
    bananas, tomatoes, etc.
  • Incidental improvement in fruit texture and meat
    color

15
How does irradiation do so many different things?
  • High doses damage or kills cells
  • Kills microorganisms or insects
  • Lower doses alter chemical reactions and
    interfere with cell division
  • Delay fruit ripening
  • Prevent sprouting or parasite reproduction

16
Are irradiated foods safe to eat?
  • Foods cannot become radioactive at energies used
    in irradiation
  • Below 10 kGy there are no known toxicological,
    microbiological, or nutritional problems

17
Foods Approved for Irradiation in the United
States
  • Fresh fruits and vegetables
  • Herbs and spices
  • Pork
  • Potatoes
  • Poultry

18
Important Terminology
  • Ion Atom that has been made electrically charged
    by the removal or one or more electron.
  • Gray Unit of energy absorbed by a material. 1000
    Gy 1 kGy
  • Radura Official symbol or logo indicating that
    food has been irradiated.

19
Sources of Additional Information
  • American Council on Science and Health
  • http//www.acsh.org/food/index.html
  • World Health Organization
  • Safety and Nutritional Adequacy of Irradiated
    Foods
  • Institute of Food Technologists
  • Radiation Preservation of Foods
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