International Organization for Standardization (ISO)
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ISO 17997-1:2004
Scope
This part of ISO 17997 | IDF 29 specifies a reference method for the indirect determination of the casein-nitrogen content of bovine milk.
The method can be modified for milk from other species or liquid dairy products.
NOTE Casein nitrogen will decrease with milk storage time due to casein breakdown even at 4 ℃. The casein nitrogen of heat-treated milk will be artificially high because of whey-protein denaturation.
ISO 17997-1:2004 Referenced Document
ISO 1042:1998 Laboratory glassware - One-mark volumetric flasks
ISO 648:1977 Laboratory glassware; One-mark pipettes
ISO 17997-1:2004 history
2004ISO 17997-1:2004 Milk - Determination of casein-nitrogen content - Part 1: Indirect method (Reference method)