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Nutrition

Question
18 out of 74
 

Test for efficacy of pasteurization of milk is?


A Methylene blue test

B Phosphatase test
C OTA Test

D Nitric Acid test

Ans. B Phosphatase test Ref: Park, 22nd Edi, Pg : 563

Tests Performed on milk

Test performed on pasteurized milk

a. Phosphatase test: raw milk contains phosphatase which is destroyed on heating

b. Standard plate count: a limit of 30,000 bacterial count per ml

c. Coliform count: coliforms be absent in 1 ml of milk

Methylene blue reduction test

Indirect method for detection of microorganism in milk.

Carried out on milk accepted for pasteurization.

Methylene blue is added to 10 ml milk and sample is held at 37 degree C until blue color has disappeared.

Milk that remains blue longer is good quality.

Bacteria growing in the milk bring about a decrease in colour.

Cheap and time saving.

Pasteurization

Kills 90% of bacteria including more heat resistant tubercle bacillus and Q fever organism

It doesn’t kill thermoduric bacteria or the bacterial spores.

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