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1‐ O ‐alkyl‐2‐(ω‐oxo)acyl‐ sn ‐glycerols from shark oil and human milk fat are potential precursors of PAF mimics and GHB
Author(s) -
Hartvigsen Karsten,
Ravandi Amir,
Harkewicz Richard,
Kamido Hiroshi,
Bukhave Klaus,
Hølmer Gunhild,
Kuksis Arnis
Publication year - 2006
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-006-5019-4
Subject(s) - lipidology , clinical chemistry , chemistry , milk fat , food science , alkyl , stereochemistry , biochemistry , organic chemistry , linseed oil
This study examines the feasibility that peroxidation and lipolysis of 1‐ O ‐alkyl‐2,3‐diacyl‐ sn ‐glycerols (DAGE) found in shark liver oil and human milk fat constitutes a potential source of dietary precursors of platelet activating factor (PAF) mimics and of gamma‐hydroxybutyrate (GHB). Purified DAGE were converted into 1‐ O ‐alkyl‐2‐acyl‐ sn ‐glycerols by pancreatic lipase, without isomerization, and transformed into 1‐ O ‐alkyl‐2‐oxoacyl‐ sn ‐glycerols by mild autooxidation. The various core aldehydes without derivatization, as well as the corresponding dinitrophenylhydrazones, were characterized by chromatographic retention time and diagnostic ions by online electrospray mass spectrometry. Core aldehydes of oxidized shark liver oil yielded 23 molecular species of 1‐ O ‐alkyl‐ sn ‐glycerols with short‐chain sn ‐2 oxoacyl groups, ranging from 4 to 13 carbons, some unsaturated. Autooxidation of human milk fat yielded 1‐ O ‐octadecyl‐2‐(9‐oxo)nonanoyl‐ sn ‐glycerol, as the major core aldehyde. Because diradylglycerols with short fatty chains are absorbed in the intestine and react with cytidine diphosphate‐choline in the enterocytes, it is concluded that formation of such PAF mimics as 1‐ O ‐alkyl‐2‐(ω‐oxo)acyl‐ sn ‐glycerophosphocholine from unsaturated dietary DAGE is a realistic possibility. Likewise, a C 4 core alcohol produced by aldol‐keto reduction of a C 4 core aldehyde constitutes a dietary precursor of the neuromodulator and recreational drug GHB, which has not been previously pointed out.