Seasonal variation in the positional distribution of fatty acids in bovine milk fat

Sine Yener*, Sara Pacheco-Pappenheim, Jeroen M.L. Heck, Hein J.F. van Valenberg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The aim of this study was to determine the seasonal variation in the positional distribution of fatty acids (FA) in bovine milk fat. Bovine milk samples were collected from May 2017 to April 2018 in the Netherlands, and the FA composition in the sn-2 position was determined by using sn-1(3)-selective transesterification of Candida antarctica lipase B. The majority of the FA showed significant variation at sn-2 and sn-1(3) positions between different seasons. The seasonal variation in sn-2 position was higher than the sn-1(3) positions. Parallel to the changes in the diet of the cows throughout a year, we observed an increase in blood-derived FA (i.e. C18:0, C18:1 cis-9) concentrations and a decrease in de novo–synthesized FA during summer. In winter, more saturated FA were esterified in sn-2 position of milk fat. Highest concentrations of palmitic acid, C16:0, was observed in sn-2 position in winter, whereas the amount of unsaturated FA at this position was highest in summer. These results showed that the FA compositions in different regiospecific positions changed due to season; however, the proportions of a specific FA within the 3 positions of the triacylglycerols in milk fat did not change upon seasonal variation.

Original languageEnglish
Pages (from-to)12274-12285
JournalJournal of Dairy Science
Volume104
Issue number12
Early online date29 Sep 2021
DOIs
Publication statusPublished - 2021

Keywords

  • Candida antarctica lipase
  • cow milk fat
  • regiospecificity
  • sn-2 position
  • triacylglycerol

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