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The Specificity of Milk Lipase. IV. Partition of the Lipase System in Milk¹

Department of Dairy Industry, University of California, Davis

ABSTRACT

In the previous papers of this series (6, 7) evidence was presented that indicates the presence in milk of multiple lipolytic enzymes that include both lipase and simple esterases. Since milk contains no simple esters to serve as substrate, and the use of esters other than milk fat for lipase determination in milk can not be justified (6, 7), the presence of esterases is of only theoretical interest. Hydrolytic rancidity in milk results from hydrolysis of milk fat. A study of the lipase system itself in milk is, therefore, of fundamental and practical importance. A knowledge of the distribution of milk lipase or lipases among various fractions of milk is essential both for the isolation of the enzymes and an understanding of the mechanism of action of this enzyme system. The present paper deals with the identifying of different lipases on the basis of their partition among some milk components.

¹ This study was supported in part by funds from The California Dairy Industry Advisory Board.

² Present address: Northern Utilization Research Branch, USDA, Peoria, Illinois.

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