Abundances of triacylglycerol positional isomers and enantiomers comprised of a dipalmitoylglycerol backbone and short- or medium-chain fatty acids in bovine milk fat

Toshiharu Nagai, Natsuko Watanabe, Kazuaki Yoshinaga, Hoyo Mizobe, Koichi Kojima, Ikuma Kuroda, Yuki Odanaka, Tadao Saito, Fumiaki Beppu, Naohiro Gotoh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Bovine milk fat (BMF) is composed of triacylglycerols (TAG) rich in palmitic acid (P), oleic acid (O), and short-chain or medium-chain fatty acids (SCFAs or MCFAs). The composition and binding positions of the fatty acids on the glycerol backbone determine their physical and nutritional properties. SCFAs and MCFAs are known to characteristically bind to the sn-3 position of the TAGs in BMF; however, there are very few non-destructive analyses of TAG enantiomers binding the fatty acids at this position. We previously reported a method to resolve the enantiomers of TAGs, binding both long-chain saturated fatty acid and unsaturated fatty acid at the sn-1 and 3 positions, in palm oil, fish oil, and marine mammal oil using chiral HPLC. Here, we further developed a method to resolve several TAG enantiomers containing a dipalmitoyl (PP) glycerol backbone and one SCFA (or MCFA) in BMF. We revealed that the predominant TAG structure in BMF was homochiral, such as 1,2-dipalmitoyl-3-butyroyl-sn-glycerol. This is the first quantitative determination of many TAG enantiomers, which bind to a SCFA or MCFA, in BMF was evaluated simultaneously. Furthermore, the results indicated that the amount ratios of the positional isomers and enantiomers of TAGs consisting of a dipalmitoyl (PP) glycerol backbone and SCFA (or MCFA), resembled the whole TAG structures containing the other diacylglycerol backbones consisting of P, O, myristic acid, and/or stearic acid in BMF.

Original languageEnglish
Pages (from-to)943-952
Number of pages10
JournalJournal of oleo science
Volume64
Issue number9
DOIs
Publication statusPublished - 2015 Sep 1

Keywords

  • Chiral separation
  • Enantiomers
  • Milk fat
  • Triacylglycerol

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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