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Stereospecific distribution of fatty acids in bovine milk fat triglycerides

Published online by Cambridge University Press:  01 June 2009

Peter W. Parodi
Peter W. Parodi
Affiliation:
Fats Research Laboratory, The Butter Marketing Board, Hamilton Central, Queensland, Australia, 4007
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Summary

Pancreatic lipase deacylation was used to study the variation in distribution of the fatty acids at position sn-2 of milk fat triglycerides of a series of butters and of the milk obtained from a cow on a restricted feeding regimen. Selected samples were analysed for stereospecific distribution of their triglyceride fatty acids which were found to be esterified in a non-random manner. The percentage of a fatty acid at position sn-3 generally decreased with increase in the chain length of the acid; the reverse occurred at position sn-1. There was no major variation in the stereospecific distribution of fatty acids throughout the year; the variation that did occur was exhibited mainly by the medium chain length acids. Variation was greater at positions sn-1 and sn-3 than at position sn-2 and when the proportion of an acid varied at position sn-1 it usually varied at position sn-3 in the reverse manner.

For the milk samples it was found that change in triglyceride fatty acid composition was not associated with random increases or decreases of fatty acids at the 3 stereospecific positions. With changing triglyceride fatty acid composition (6:0, 8:0, 10:0, 12:0, 14:0, and 16:0 decreasing and 18:1 increasing) the percentage of 6:0, 8:0, 10:0, 12:0, 14:0 and 16:0 acids at position sn-3 decreased while the percentage of 18:0 and 18:1 acids increased. These changes were compensated for by changes in the opposite direction at positions sn-1 and sn-2.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 75 - 81
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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