Saturday, November 21, 2009

Pasteurization of Milk.


The aim of pasteurization of milk is to get rid of any disease-producing bacteria it may contain and to reduce substantially the total bacterial count for improved keeping qualities. pasteurization of milk destroys approximately 99% of all bacteria and also most of the yeast's and molds. Generally two methods are employed in pasteurization.

One method consists of holding every particle of milk for 30 min at 61.7 degree centigrade followed by rapid cooling. This is a batch process.

In high temp short time (HTST) method the milk is held for not less than 15 seconds at 71.7c. This is a continuous process. Ultra-high temperature treatment at 93.4 degree centigrade for 3 sec are also employed.

As pasteurized milk is not sterile it must be quickly cooled after pasteurization to prevent multiplication of surviving bacteria. The thoroughness of pasteurization of milk is ascertained by testing for the alkaline phosphate activity in milk.

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