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Fish oil tetracosenoic acid isomers and GLC analyses of polyunsaturated fatty acids
Author(s) -
Shantha N. C.,
Ackman R. G.
Publication year - 1991
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/bf02543978
Subject(s) - chemistry , fish oil , polyunsaturated fatty acid , fatty acid , chromatography , structural isomer , fish <actinopterygii> , elution , fatty acid methyl ester , gas chromatography , organic chemistry , biology , catalysis , fishery , biodiesel
Abstract The total tetracosenoic acid (24∶1) levels in nine marine oils examined ranged from 0.4 to 1.1% of the total fatty acids. Gas‐liquid chromatography (GLC) analysis of whole fish oil fatty acid methyl esters usually shows a single 24∶1 peak, as the dominant (60–90%) isomer is 24∶1ω9, and the minor peaks are not seen. Isolation and oxidative fission demonstrate that the lesser isomers present in these oils (in the first peak to elute) include 24∶1ω15, 24∶1ω13 and 24∶1ω11, which are not resolvable from each other on open‐tubular GLC; 24∶1ω9 is followed by a peak for 24∶1ω7. The complex first 24∶1 isomer peak of fish oil fatty acids tends to coincide with or just follows the 22∶6ω3 peak in GLC analyses carried out on Carbowax‐20M type open‐tubular (capillary) columns.