Food processing: canning, drying, irradiation

Question 1

Buying canned food

Answer 1

Avoid bulging, dented or rusting cand, contents may contain food poisoning.
Read label - check contents. Fruit may be canned in syrup/fruit juice.
Fish in oil, brine (salty water), sauce.
Check expiry date.

Question 2

Drying

Answer 2

Heat removes water. Prevents micro-organism growing bc cannot live w/o moisture.

Question 3

Buying dried food

Answer 3

Packaging intact

Check expiry date

Question 4

Irradiation

Answer 4

Energy waves passed through food. Micro-organisms killed. Food keeps for long time.
Vitamins reduced.
Controversy as manufacturers may be disguising stale food as fresh

Question 5

Radura symbol

Answer 5

Shows food stuff has been irradiated.

Question 6

Canning

Answer 6

Heat destroys micro-organisms. Food kept in airtight sterilised cans to prevent further contamination.

Question 7

Frozen food - food value, appearance, flavour, texture

Answer 7

Food value - do not lose vit + min content

Appearance - Do not lose colour, esp if blanched nevofe

Flavour - Retained

Texture - Do not become too soft

Question 8

Canned - food value, appearance, flavour, texture

Answer 8

Food value - Vitamins destroyed

Appearance - Colour lost

Flavour - Some lost

Texture - Fruit + veg become soft

Question 9

Dried food - food value, appearance, flavour, texture

Answer 9

Food value - Vits destroyed

Appearance - Some colour lost, Changes shape & size of some foods eg veg + fruit

Flavour - Some losg

Texture - Changes

Question 10

Irradiated food - Food value

Answer 10

Lose vitamins (reduced)