标准摘要
[中文适用范围]： 本标准规定了采用凯氏定氮法、常规法和块消解法测定乳及乳制品中氮含量和计算粗蛋白含量的方法。 该程序适用于： 液态牛奶（全脂、半脱脂或脱脂）、全脂山羊奶和绵羊奶；硬质、半硬质和加工奶酪；奶粉及奶粉制品（包括乳基婴儿配方奶粉、浓缩乳蛋白、浓缩乳清蛋白、酪蛋白和酪蛋白酸盐）。 该方法不适用于含有酪蛋白酸铵的样品。 注：如果本国际标准规定的产品中存在非乳蛋白源，则粗蛋白的结果将不准确。 [外文原描述]： 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.
英文名称Milk and milk products — Determination of nitrogen content — Part 1: Kjeldahl principle and crude protein calculation