B4.13 Preventing Decay Flashcards
1
Q
Define preservation
A
Processes that prevent food or other organic material from decaying
Canning,freezing, drying, salting
2
Q
Explain canning
A
Food sealed in metal container
Heated to kill any microbes
Prevent the entry of oxygen and any other decomposer microbes
3
Q
Explain cooling
A
Placed in fridge (4 degrees)
Reproduction of decomposers is slowed down
4
Q
Explain freezing
A
Keep food at low temp often -5.
Decomposers stop reproducing
5
Q
Explain drying
A
Food (eg pasta) dried.
No water- decomposers do not grow/reproduce
6
Q
Explain adding salt
A
Some foods are salted (cured meats/fish)
salt causes water to be drawn out of the microbes by osmosis- kills them.
7
Q
Explain adding sugar
A
Sugar causes water to be drawn out of the microbes by omosis
8
Q
Adding vinegar
A
Acid kills decomposers
