1. Prevent or delay the decomposition of food caused by microorganisms, such as
1.1 keeping food sterile
1.2 get rid of existing microorganisms. Such as washing or filter out
1.3 reduce the growth and the activities of microorganisms, such as low temperature drying or
keep condition without oxygen
1.4 destroy microorganisms. Such as providing heat radiation
2.To prevent or delay the degradation occurring of food
2.1 destroyed or inhibit the function of the enzyme in food
2.2 chemical such as Protective slag oxidation in food
3. Preventing food from insect
.
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