Cholesterol esters of milk and mammary tissue |
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Authors: | T W Keenan Stuart Patton |
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Affiliation: | (1) Present address: Department of Animal Sciences, Purdue University, 47907 Lafayette, Ind.;(2) Lipids Laboratory, Division of Food Science and Industry, Pennsylvania State University, 16802 University Park, Pennsylvania |
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Abstract: | The fatty acid composition and metabolic activity of cholesterol esters in milk and mammary tissue (cow, sow and goat) were
investigated. Cholesterol esters of freshly secreted milks incubated at 40 C for 2 hr showed no change in fatty acid composition
and no incorporation of 1-14C-palmitate. The fatty acid composition of cholesterol esters in the milk of all three species exhibited elevated levels of
a unique group of fatty acids when compared to other milk ester lipid classes. This group was comprised of monounsaturated
acids and acids with odd numbers of carbons. Tissue cholesterol esters contained lower levels of these acids. Evidence from
experiments in which an odd carbon acid (C15) was infused into the lactating mammary gland indicated that the group of unique acids is preferentially retained in the
cholesterol ester fraction which is secreted with milk. These infusion experiments also provided evidence that cholesterol
esters accumulate in developing milk fat globules in a manner paralleling triglyceride accumulation, and that acyl moieties
of cholesterol esters may be desaturated in the form of the intact ester. Our results are compatible with the hypothesis that
acyl moieties of cholesterol esters in lactating mammary tissue are turning over rapidly.
Paper No. 3496 in the journal series of the Pennsylvania Agricultural Experiment Station. |
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