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Journal of Lipid Research, Vol. 9, 388-393, May 1968
Copyright © 1968 by Lipid Research, Inc.

Specific distribution of short-chain fatty acids in molecular distillates of bovine milk fat

W. C. Breckenridge and A. Kuksis

Department of Biochemistry and Banting and Best Department of Medical Research, University of Toronto, Toronto, Canada

Triglycerides with a total of 34-44 acyl carbon atoms have previously been shown to account for nearly 50% of bovine milk fat. About 80% of this material was isolated by molecular distillation and a representative fraction of these glycerides was subjected to a stereospecific analysis. Of the 29 moles % of C4-C8 fatty acids present in the analyzed fraction, at least 95% were specifically attached to the glycerol molecule in the position corresponding to carbon 3 of sn-glycerol 3-(dihydrogen phosphate) (L-agr-glycerophosphate). The distribution of the other fatty acids (C10 or greater) did not show such marked specificity for either the 1- or the 2-position.

The data support the hypothesis that the short-chain fatty acids are esterified with long-chain diglycerides, or are substituted in glycerophosphatide intermediates, during the final step in the biosynthesis of milk fat triglycerides.

Supplementary key words bovine milk • triglycerides • molecular distillate • short-chain acids • specific distribution • stereospecific analysis • gas-liquid chromatography

Submitted on September 19, 1967
Accepted on February 26, 1968


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