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ISO 3356:1975
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ISO 3356:1975 Milk and dried milk, buttermilk and buttermilk powder, whey and whey powder -- Determination of phosphatase activity (Reference method)
standard by International Organization for Standardization, 07/01/1975
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Full Description
Can be applied for the control of proper pasteurization of the products specified in the title of this standard. Uses a principle of determination based on the dilution of the liquid product or the reconstituted liquid product with a buffer at pH 10.6 containing disodium phenylphosphate and incubation at 37 degrees centigrade for 1 h. By reaction with the alkaline phosphatase present in the product phenol is liberated which reacts with dibromopquinonechloroimide. Then the colour formed is measured photometrically.