pasteurization păs˝cho͝orĭzā´shən, –rīzā´shən [key], partial sterilization of liquids such as milk, orange juice, wine, and beer, as well as cheese, to destroy disease-causing and other undesirable organisms. The process is named for the French scientist Louis Pasteur, who discovered in the 1860s that undesired fermentation could be prevented in wine and beer by heating it to 135°C (57°C) for a few minutes. Milk is pasteurized by heating it to about 145°C (63°C) for 30 min or by the
flashmethod of heating to 160°C (71°C) for 15 sec, followed by rapid cooling to below 50°C (10°C), at which temperature it is stored. The harmless lactic acid bacteria survive the process, but if the milk is not kept cold, they multiply rapidly and cause it to turn sour.
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