Preservative | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-07

This is an audio version of the Wikipedia Article:
Preservative


00:00:53 1 Antimicrobial preservatives
00:01:37 2 Antioxidants
00:02:40 3 Nonsynthetic compounds for food preservation
00:03:38 4 History and methods
00:04:45 4.1 Drying
00:05:25 4.2 Freezing
00:05:56 4.3 Fermenting
00:06:42 4.4 Pickling
00:07:42 4.5 Curing
00:08:21 4.6 Jam and Jelly
00:08:55 4.7 Canning
00:09:52 5 Public awareness of food preservation



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SUMMARY
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A preservative is a substance or a chemical that is added to products such as food, beverages, pharmaceutical drugs, paints, biological samples, cosmetics, wood, and many other products to prevent decomposition by microbial growth or by undesirable chemical changes. In general, preservation is implemented in two modes, chemical and physical. Chemical preservation entails adding chemical compounds to the product. Physical preservation entails processes such as refrigeration or drying. Preservative food additives reduce the risk of foodborne infections, decrease microbial spoilage, and preserve fresh attributes and nutritional quality.  Some physical techniques for food preservation include dehydration, UV-C radiation, freeze-drying, and refrigeration. Chemical preservation and physical preservation techniques are sometimes combined.