Alcohol test

     The salts of milk are in a particular ratio with each other. When this ratio is disturbed because of colostrum, late lactation or udder infection, milk becomes less stable to heat.

0bjectives:

·         To study the stability of milk to processing particularly for condensing and sterilization.

·         To detect abnormal milk such as colostrum, late lactation, mastitic milk and milk with salt imbalance.

Apparatus

·         Test tube preferably with a mark at 5 and 10 ml

Reagents

·         Ethyl Alcohol: 68 % (w/v) or 75% (v/v)

Procedure

·         Transfer 5 ml of milk sample to a test tube and add equal quantity of (75% by vol.) ethyl alcohol.

·         Mix the contents of the test tube by inverting several times.

·         Examine for the presence of flakes or clots and also note the size of flakes.