what is preservation ? what are different method to preserve food items ?
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Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals. Advances in packaging materials have played an important role in modern food preservation.
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Salts are edible oils are the common chemicals generally used to check the growth of microorganisms therefore they are called preservatives .
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