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Relationship between the Aliphatic-Lactones and Fatty Acids in Ruminant Milk Lipids¹

Division of Food Science and Industry, The Pennsylvania State University, University Park 16802

ABSTRACT

The -C10, -C12, and -C14 lactones isolated from milk lipids following the intravenous administration of (1-carbon 14) acetate to a lactating goat had lower specific radioactivities compared to their corresponding fatty acids. The -C16 lactone had a higher specific radioactivity than the palmitic acid at 3 and 4 h after administration of tracer reflecting the dilution of the endogenous palmitic acid by that supplied by the circulating blood lipids. Several explanations for the dilution in specific radioactivity of the resulting lactones are discussed.

¹ Authorized for publication on March 13, 1973, as paper no. 4409 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

² Present address: Borden, Inc. Research Center, 600 N. Franklin Street, Syracuse, New York 13204.

³ Present address: New Zealand Dairy Research Institute, P.O. Box 1204, Palmerston North, New Zealand.