**4.9 Milk**

There are various methods for bacterial analysis in the milk. The most used methods include alive bacteria count in petri plate, direct microscope count, coliform bacteria detection, methylene blue assay, phosphatase assay, turbidity assay and assay for special bacteria search. These methods are applied to various milks.

The milk which will be drunk should not include bacteria more than 30,000 and coliform bacteria in 0,1 cm3. 0,01 cm3 of pasteurized milk should not include any coliform bacteria and its pasteurization should be understood by phosphatase assay. Turbidity assay should be positive in sterilized milk.

The milk which was milked in the morning is kept waiting 9 to 11 hours in the shadow and the milk which was milked at night is kept waiting until the next day. Other samples are tried immediately when they come to the laboratory. Milk that analysis is not performed immediately may be stored at refrigerator for 24 hours at most.
