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Lysozyme, Lipase, and Ribonuclease in Milk of Various Species ^{1, 2}

Department of Dairy Science, University of Nebraska, Lincoln

ABSTRACT

Milk contains a variety of enzymes (10). In our earlier publications (5, 11), we reported that the average lysozyme content of human milk is approximately 3,000 times that of cow's milk. Such significant differences in the lysozyme content may have physiological or nutritional implications in infant feeding, because of the reported possible beneficial effects of this enzyme upon the digestibility and keeping quality of milk (3, 9). Very little information is presently available on other enzymes in human milk and in milks of those species used as dairy animals in various parts of the world.

The objective of this study was to compare quantitatively the lysozyme, lipase, and ribonuclease activities of milks of human, cow, goat, sheep, and sow, to assess the possible significance of their presence in milk.

Experimental Procedures

The samples of human milk used in this study were collected fresh from the local hospital and the other milk samples from the College of Agriculture Experiment Station.

¹ Published with the approval of the Director as paper no. 2139, Journal Series, Nebraska Agricultural Experiment Station, Lincoln.

² This work was supported in part by the USPHS Research Grant HD-00858.

¹ Present address: Unilever Research Laboratory, Hertfordshire, England.

² Eastern Util. Res. Div., ARS, USDA, Philadelphia.

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