Q. 205.0( 5 Votes )

Write the different methods of food preservation.

Answer :

Different methods of food preservation are-

1. Storage and Packing: where water is removed from foodstuff preventing the growth of microbes. Examples- vegetables, dry fruits, pulses, spices etc.

2. Preservation by chemicals- Sodium benzoate, sodium metabisulphite etc. are used as preservatives to store pickles, jam, squashes etc. They prevent the attack of the microbes.

3. Preservation by Common Salt- Adding of common salt helps to preserve meat, fish for ages.

4. Preservation by sugar- sugar is added to jam, jellies, squashes which reduces the moisture content which inhibits the growth of bacteria which spoil food.

5. Preservation of oil and vinegar- Use of oil and vinegar prevents spoilage of pickles because bacteria cannot live in such an environment. Vegetables, fruits, fish and meat are often preserved by this method.

6. Pasteurization- Pasteurization is a process in which the liquid substance is heated to a temperature of 70oC for 15 to 30 Seconds and the suddenly chilled and stored. It is used to preserve wine, milk etc.

7. Irradiation- High energy gamma rays or X-rays are used to preserve foods.

8. Vacuum drying- Milk is converted into milk powder by this process where moisture is removed.

9. Proper storage and packing- dry fruits, vegetables are properly stored and sealed in air-tight packets.

10. Hot and cold treatment- We can boil food and store or we can refrigerate foods at very low temperature. Because microbes die at very high or low temperature.

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