ISO 8968-1:2014

Milk and milk products — Determination of nitrogen content — Part 1: Kjeldahl principle and crude protein calculation

Publication date:   Feb 3, 2014

General information

90.60 Close of review   Jun 5, 2019


ISO/TC 34/SC 5 Milk and milk products

International Standard

67.100.10   Milk and processed milk products



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ISO 8968-1|IDF 20-1:2014 specifies a method for the determination of the nitrogen content and crude protein calculation of milk and milk products by the Kjeldahl principle, using traditional and block digestion methods. The methods are applicable to: liquid cow's (whole, partially skimmed or skimmed milk), goat's and sheep's whole milk; hard, semi-hard and processed cheese; dried milk and dried milk products (including milk-based infant formulae, milk protein concentrate, whey protein concentrate, casein and caseinate). The methods are not applicable to samples containing ammonium caseinate.

Life cycle


ISO 8968-1:2014
90.60 Close of review
Jun 5, 2019