pasteurization

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Related to pasteurized milk: homogenized milk, Unpasteurized Milk

pasteurization

(păs'cho͝orĭzā`shən, –rīzā`shən), 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 PasteurPasteur, Louis
, 1822–95, French chemist. He taught at Dijon, Strasbourg, and Lille, and in Paris at the École normale supérieure and the Sorbonne (1867–89).
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, who discovered in the 1860s that undesired fermentation could be prevented in wine and beer by heating it to 135°F; (57°C;) for a few minutes. Milk is pasteurized by heating it to about 145°F; (63°C;) for 30 min or by the "flash" method of heating to 160°F; (71°C;) for 15 sec, followed by rapid cooling to below 50°F; (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.

Pasteurization

 

the heating of liquids or foods generally to a temperature of 60°-70°C for 15–30 min. In the process, nonspore-forming bacteria are destroyed, but complete sterilization does not result since bacterial spores can withstand such heating. Proposed by L. Pasteur, the method is mainly used to preserve food products that cannot tolerate heating to higher temperatures.

Milk, wine, beer, and other beverages and various foods are pasteurized on an industrial scale. It is recommended that once they are pasteurized, they be kept at a low temperature in order to prevent the germination of bacterial spores.

A related process is fractional sterilization, or tyndallization. After routine pasteurization, the product is cooled and kept for some time at room temperature. When the surviving spores begin to germinate, the product is pasteurized again. Pasteurization is sometimes repeated three or four times.

Milk, cream, juices, and other beverages are pasteurized in centrifugal, tubular, or lamellar pasteurizers. The product is quickly and briefly heated to comparatively high temperatures (up to 100°C) as it continuously flows in a thin layer between the heating surfaces. It is then poured into hermetically sealed containers. Foods that are already bottled or canned are pasteurized by heating with steam while the containers are constantly rotated. Pasteurization of already packaged products using high-frequency sources of heat is a promising development.

pasteurization

(science and technology)
The application of heat to matter for a specified time to destroy harmful microorganisms or other undesirable species.
References in periodicals archive ?
Considering the results obtained, it is concluded that the rates of positive samples for antibiotic residues of [beta]-lactams and tetracyclic in pasteurized milk marketed in the microregion of Capanema - PR are high, thereby demonstrating deficiencies in monitoring of these chemical residues which are still the most antimicrobials used in the treatment of diseases affecting the dairy herd.
30 log10cfu/ml, respectively (Table 2), while pasteurized milk had mean count of 0.
46) They further dispute the claim that raw milk has any nutritional or medicinal quality beyond that of pasteurized milk.
Development of Iron Fortified Pasteurized Milk (IFPM): Raw buffalo milk was fortified with FeSO4 at a concentration of 0.
It is more common in the villages and urban slums as people are unaware of the pasteurized milk and its benefits.
Pasteurized milk packets: pasteurized milk packets including the milk packets of Gourmet, Doce, Hala and Nurpur and from the bakeries were collected and observed.
All 16 patients reported drinking glass-bottled, pasteurized milk from dairy A; three patients also reported eating dairy A ice cream.
For them, it contains the nutrients that pasteurized milk does not have.
The debate is not over raw milk versus pasteurized milk.