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Magnusson-

Micro-organisms and Food- food spoilage

QuestionAnswer
What does salting prevent? Micro-organisms taking in water
What does adding sugar do to the micro-organism? It inhibits the growth
How does it inhibit the growth? prevents the absorbtion of water
Give an example of how addng sugar is used Jam's or marmalade
How does freezing affect the mirco-organism? It slows the growth of micro-organisms
What temperature does a freezer keep foods at? -18 degrees
When 'pickling', what does the food have to be in? Acidic vinegar
How does pickling affect microbes? Inbits growth. The low pH of the vinegar reduces enzyme activity
How does cooking kill microbes? The heat denatures the enzymes/active sites of it. Meaning no reactions can take place
What does irradiation involve? Exposing foods to radiaton
What rays are used in irradiation? X-rays and gamma rays
How does irradiation affect the shelf life of food? It extends it considerably
Created by: PearceH
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