The sample was treated by ammonium sulphate, then filtering and heating, and the filtrate showed turbidity due to presence of albumin on account of insufficient heat treatment.

• 根据牛奶加热方式的不同,其蛋白变性存在一定的差异,表现为牛奶的白浊度明显不同,因而可用浊度仪来测定。