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Reinvestigation of the polymethylene‐interrupted 18:2 and 20:2 acids of Ginkgo biloba seed lipids
Author(s) -
Wolff Robert L.,
Christie William W.,
Marpeau Anne M.
Publication year - 1999
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-999-0230-0
Subject(s) - ginkgo biloba , chemistry , gymnosperm , fatty acid , ginkgo , vaccenic acid , organic chemistry , chromatography , botany , linoleic acid , biology , conjugated linoleic acid
The fatty acid composition of Ginkgo biloba seed lipids was reinvestigated with particular emphasis on the polymethylene‐interrupted octadecadienoic and eicosadienoic acids. Analysis of the picolinyl esters and 4,4‐dimethyloxazoline derivatives by capillary gas‐liquid chromatography on a highly polar cyanopropyl polysiloxane stationary phase coupled with mass spectrometry revealed the presence of three such acids, with the structures 5,9–18:2, 5,11–18:2, and 5,11–20:2. This indicated that in G. biloba seeds, cis ‐vaccenic (11–18:1) acid may be a substrate for the Δ5‐desaturase characteristic of gymnosperms. The 5,11‐18:2 acid was not limited to G. biloba, as it may occur in a few other species. The 5,11‐20:2 acid is a common component of the seed lipids from almost all gymnosperm species analyzed so far.