1 -O-alkyl-2-(omega-oxo)acyl-sn-glycerols from shark oil and human milk fat are potential precursors of PAF mimics and GHB.
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-(omega-oxo)acyl-sn-glycerophosphocholine from unsaturated dietary DAGE is a realistic possibility. Likewise, a C4 core alcohol produced by aldol-keto reduction of a C4 core aldehyde constitutes a dietary precursor of the neuromodulator and recreational drug GHB, which has not been previously pointed out.
Hartvigsen
Karsten
K
Biocentrum-DTU, Biochemistry and Nutrition, Centre for Advanced Food Studies, Technical University of Denmark, DK-2800 Lyngby, Denmark.
Ravandi
Amir
A
Harkewicz
Richard
R
Kamido
Hiroshi
H
Bukhave
Klaus
K
Hølmera
Gunhild
G
Kuksis
Arnis
A
D000447:Aldehydes / Q000737:chemistry; D000818:Animals; D001711:Biotransformation; D005395:Fish Oils / Q000737:chemistry*; D005989:Glycerides / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D008049:Lipase / Q000737:chemistry / Q000378:metabolism; D008895:Milk, Human / Q000737:chemistry*; D015394:Molecular Structure; D010972:Platelet Activating Factor / Q000031:analogs & derivatives / Q000096:biosynthesis* / Q000737:chemistry; D012754:Sharks; D012978:Sodium Oxybate / Q000737:chemistry / Q000378:metabolism*; D021241:Spectrometry, Mass, Electrospray Ionization; D013237:Stereoisomerism
D000447:Aldehydes; D005395:Fish Oils; D005989:Glycerides; D010972:Platelet Activating Factor; D012978:Sodium Oxybate; D008049:Lipase