Microbiology Procedure
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Ultrapasteurization


Ultrapasteurization
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It is also used in some dairy plants. Here the milk and milk products are subjected to heat at 82°C for three seconds only. Pasteurisation destroys the pathogenic, bacteria that may be transmitted by milk.

The pasteurised milk is graded into different grades on the basis of total bacterial counts. In different grades of milk, standards in respect of bacterial content per ml of milk vary from localities to localities.


Some bacteria are able to survive pasteurisation, causing milk spoilage. Streptococcus lactis, Lactobacil1s casei and L. cremoris, produce acids, causing the protein to turn into curd.

These bacteria which are able to endure the heat of pasteurisation are called thermoduric. Pasteurisation has no effect on thermo­philic bacteria which grow well at 60°C to 70°C.

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