Micro-organisms Flashcards
1
Q
Conditions necessary for the growth of micro-organisms
A
Food- Bactria like high protein foods
Warmth- 30-45’C. Boiling kills. Freezing slows growth
Moisture- Damp conditions and moist foods
Oxygen- Most need to survive
Time- Needs time to produce more bacteria
2
Q
Food poisoning bacteria
A
Salmonella- Intestines of animals and humans
Listeria- Chilled foods
3
Q
Why is food processed?
A
To kill harmful bacteria Prevents waste Prevents enzyme activity Adds variety to food Adds nutrients Seasonal foods available all year
4
Q
Guidelines when freezing vegetables
A
Prepare vegetables for cooking Blanch the vegetables for the recommended amount of time in boiling water Chill the vegetables in iced water Seal and label Package in freezer bags and remove air
5
Q
Blast freezing
A
Carried out commercially (-30*C)
Best method
Cell wall not damaged
6
Q
Quick freezing
A
Very small ice crystals form in food
Helps keep the food firm when thawing
