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Position of Endogenous Radioactive Fatty Acids in Mammary Triglycerides

Department of Food Science, Cornell University, Ithaca, New York 14850

ABSTRACT

The position of the various fatty acids synthesized from radioactive acetate by cultured bovine mammary cells was studied with pancreatic lipase. Triglycerides were the only cell lipids which contained shortchain (C4–C8) fatty acids. Hydrolysis with lipase showed that the labeled short-chain acids were located in the primary positions of the glyceride glycerol and that medium- and long-chain fatty acids were located on both primary and secondary positions of the glycerol moiety. Diglycerides and phospholipids, which had similar radioactive fatty acid patterns, and the unesterified fatty acids lacked short-chain fatty acids.