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Question
Write about food preservation methods.
Solution
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Drying: It is the removal of water content from the food by drying it in the sunlight.
E.g. Grains. -
Addition of salt: When salt is added to food, it removes the water from the food.
E.g. Fish, Pickles. -
Addition of sugar: When sugar is added to food, it dissolves in the water content of the food and preserves the food items from spoilage.
E.g. Jam, Fruit juices. -
Freezing: The microbial growth and the enzyme activity on the frozen food items can be prevented by this method. E.g. Fruits, Vegetables.
-
Boiling: It kills the micro-organisms present in the food materials.
E.g. Milk, Water. -
Canning and bottling: In this method, food is packed in airtight cans so that germs do not grow on them.
E.g. Milk powder.
Addition of chemical -
preservatives: Chemical preservatives are added to stop the growth of micro-organisms in certain food materials.
E.g. Sodium benzoate is added with fruits, Sulphur dioxide is added with dry fruits, Vinegar is added with pickles.
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