本文件规定了测定牛奶基婴儿配方奶粉中乳清与酪蛋白比例（范围为20:80至80:20）的方法。 本方法不适用于含有水解蛋白质或其他来源蛋白质（如植物或其他哺乳动物的牛奶）的婴儿配方奶粉的分析。

This document specifies a method for the determination of the whey to casein protein ratio, ranging from 20:80 to 80:20 in cow milk-based infant formula powders. This method does not apply to the analysis of infant formulas containing hydrolysed protein or proteins from other sources (e.g. plants or milk from other mammals).