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प्रश्न
Explain any two chemical methods of food preservation.
Describe ‘any two’ chemical methods of food preservation.
उत्तर
Chemical methods used to preserve food:
a) Addition of sugar: In this method, sugar is added and then food is heated. This method
is used for the preparation of jams, jellies and marmalades. Fruits like apples, mangoes,
strawberries, carrots, etc are preserved by this method
b) Addition of salt: Common salt has antimicrobial activity. Salt is added to food to
control the growth of fungus and micro-organisms. When salt is added, bacterial
cell loses water due to osmosis. Due to this, the cell either remains dormant or dies.
This helps in storage of food. This method of preservation of food by addition of
salt is called salting. It is used for preservation of fish products, meat and for the
preparation of pickles of lemon, chillies, raw mangoes, etc. It is also used in the
preservation of amla, beans, tamarind, etc.
c) Addition of vinegar: Vinegar is added to preserve food like pickles, salad dressings,
mustard, fish, etc.
d) Addition of other chemicals: Chemicals like sodium benzoate, salts of sorbic acid and
propionic acid etc., are used as preservatives.
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