Journal
LIPIDS
Volume 43, Issue 6, Pages 533-548Publisher
WILEY
DOI: 10.1007/s11745-008-3181-6
Keywords
oat kernels; estolides; digalactosyldiacylglycerol; trigalactosyldiacylglycerol; tetragalactosyldiacylglycerol; galactolipid; mass spectrometry
Funding
- NCRR NIH HHS [P20RR16475, P20 RR016475] Funding Source: Medline
- NIGMS NIH HHS [P20 GM103418] Funding Source: Medline
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Oat kernels were extracted with methanol, and glycolipid-enriched fractions were prepared using silica solid phase extraction. Using direct infusion electrospray ionization (ESI) tandem mass spectrometry (MS), high performance liquid chromatography (HPLC)-ESI-MS, and HPLC-atmospheric pressure chemical ionization (APCI)-MS, we confirmed previous reports that digalactosyldiacylglycerol (DGDG) was the most abundant glycolipid in oat kernels and confirmed a previous report of the presence of a DGDG mono-estolide in oat kernels. In the current study we also identified several additional natural galactolipid estolides: two new DGDG estolides (di- and tri-estolides), two trigalactosyldiacylglycerol (TriGDG) estolides (mono- and di-estolides), and one tetragalactosyldiacylglycerol (TetraGDG) estolide (mono-estolide). The levels of total galactolipid estolides in oat kernels were estimated to be about 29% of the total glycolipid fraction. To our knowledge, this report is the first evidence of natural di- and tri-estolides of polar lipids.
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