long answer type question ; 1 . what are food preservatives ? explain some comman methods of food preservation .
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1. Food preservatives : A preservative is a substance or a chemical that is added to products such as food products, beverages,pharmaceutical drugs and many other products to prevent decomposition by microbial growth or by undesirable changes.
2. Common methods of food preservation are :-
- Refreigation
- Drying
- Fermentation
- Canning
- Pasteurization
- Freezing
- Irradiation
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