Food irradiation Flashcards

1
Q

What are the 3 types of irradiation?

A

X-ray
Gamma-ray
Electron-beam

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2
Q

What are the uses of food irradiation?

A

Sprout inhibition
Kills spores
Decontaminated herbs
Keeps small molecules intact

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3
Q

What are the negatives of food irradiation?

A

Accumulation of free radicals
Undesirable changes in chemistry

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4
Q

What is the chain reaction of free radicals?

A

Initiation
Propagation
Termination

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5
Q

What is the initiation process of a free radical chain reaction?

A

Double bond breaking causing a free radical

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6
Q

What is the propagation process of a free radical chain reaction?

A

Free radical breaks bond of another atom

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7
Q

What is the termination process of free radical chain reactions?

A

No more free radicals

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8
Q

What is the SI unit for ionising radiation?

A

Gray (Gy, J/kg or Ws/kg)

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9
Q

How can absorbed ionising radiation be measured?

A

Physical, chemical or biochemical dosimetry

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10
Q

What is radappertisation (10-40kGy)?

A

Food sterilisation with a high radiation dose

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11
Q

What does radappertisation (10-40kGy) kill?

A

Clostridium botulinum endospores or exotoxins

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12
Q

What is radicidation (2.5-10kGy)?

A

Food pasteurisation at medium dose

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13
Q

What does radicidation (2.5-10kGy) kill?

A

Non-spore forming pathogens

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14
Q

What is radurisation (0.75-2.5kGy)?

A

Beverage and food pasteurisation at low dose

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15
Q

What does radurisation (0.75-2.5kGy) do?

A

Inhibits sprouting and disinfects pests

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16
Q

What are the products of ionisation?

A

Short-lived radicals which destroy bacterial cells

17
Q

What is produced after radicals destroy bacterial cells?

A

Hydrogen peroxide

18
Q

What is the role of hydrogen peroxide in food irradiation?

A

Biological toxicant for harmful microbes

19
Q

What is the packaging used for food irradiation?

A

Polyethylene

20
Q

Why is polyethylene important?

A

Prevents free radicals diffusing free radicals in the food