Pasteurization

Thumbnail-Image-Pasteurization

Pasteurization is a heat-treatment method for killing harmful bacteria in foods and drinks. It was named after Louis Pasteur, a French chemist who discovered in the 1860s that heating wine and beer to around 57 °C (135 °F) for a few minutes might prevent aberrant fermentation. Pasteurization of milk, which is usually used in various countries, including the United States, necessitates maintaining temperatures of around 63 °C (145 °F) for 30 minutes or heating to an upper temperature, 72 °C or 162 °F, and holding for 15 seconds (and yet higher temperatures for shorter periods).

In food processing, freezing is a technique of preserving food by reducing the temperature to prevent the growth of microorganisms. The procedure has been employed in cold climates for centuries, and a patent for freezing food by submerging in an ice and salt brine was obtained in the United Kingdom as early as 1842.

The timeframes and temperatures are those proven to be necessary to kill Mycobacterium TB and other disease-causing bacteria present in milk that are more heat-resistant and do not generate spores. The treatment also kills most spoilage-causing microbes, extending food storage duration.

The percentage of various solid meals entails a modest heat treatment depending on the product. The use of modest quantities of beta or gamma rays to foods to extend their storage duration is radiation pasteurization.

Food Research Lab
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