Reference number
ISO 3356:1975
© ISO 2024
ISO 3356:1975
Milk and dried milk, buttermilk and buttermilk powder, whey and whey powder — Determination of phosphatase activity (Reference method)
Edition 1
1975-07
Retirada
Retirada (Edición 1, 1975)

Resumen

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.

Informaciones generales

  • Estado
     : Retirada
    Fecha de publicación
     : 1975-07
    Etapa
    : Retirada de la Norma Internacional [95.99]
  • Edición
     : 1
    Número de páginas
     : 3
  • Comité Técnico :
    ISO/TC 34/SC 5
    ICS :
    67.100.10 
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