The lipoprotein lipase of cow ’ s milk

Cow’s milk has been found to contain a lipoprotein lipase similar to those previously demonstrated in post-heparin plasma, adipose tissue, and heart. Upon separation of the milk, most of the enzyme was found in the skim milk, although some was present in the cream from which it could be isolated with a relatively high specific activity. The triglycerides of cream were not hydrolyzed by the lipoprotein lipase, and it is supposed that the enzyme does not function in milk but rather in the lactating mammary gland.