牛奶中酪蛋白含量是衡量牛奶质量的一个重要指标，采用蛋白质等电沉淀法可测定其含量。
The content of casein can be used as a index of quality for the milk, which can be determined by the method of isoelectric precipitation.
试验结果表明：胰岛素可降低肝脏MDA含量（P<0.05），但酪蛋白酶解产物对MDA含量无显著影响（P>0.05）。
The results showed that MDA content was lower (P<0.05) in group Y than that in group P. However, MDA content showed no significant difference between group L and M (P>0.05).
因此在采用乳粉为原料生产酸奶时，不仅要考虑到全乳固体含量超过11．3％以上，而且要充分考虑到乳粉中乳糖、乳脂及全乳固体含氮物质中酪蛋白的含量，以确保生产出优质酸奶。
Contents of milk sugar, butter fat and casein should also be taken into consideration and the concentration of dry matter in milk should be over 11 3% to produce quality yoghurt.
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