cis-5-olefinic unusual fatty acids in seed lipids of gymnospermae and their distribution in triacylglycerols |
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Authors: | Toru Takagi Yutaka Itabashi |
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Affiliation: | (1) Department of Chemistry, Faculty of Fisheries, Hokkaido University, Hakodate, Japan |
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Abstract: | Open-tubular gas chromatographic analysis of fatty acids in the lipids from the seeds of 20 species of Gymnospermae showed
that they all contained nonmethylene-interrupted polyenoic (NMIP) acids as minor components and palmitic, oleic, linoleic
and α-linolenic acids as major components. The NMIP acids have an additional 5,6-ethylenic bond in ordinary plant unsaturated
fatty acids and the following C2 elongation acids:cis-5,cis-9-octadecadienoic acid (5,9–18∶2) (I); 5,9,12–18∶3 (II); 5,9,12,15–18∶4, 5,11–20∶2, 5,11,14–20∶3 (III); and 5,11,14,17–20∶4
(IV). The main NMIP acids found in neutral lipids are I in two species ofTaxus, II in seven species of Pinaceae, III in two species of Podocarpaceae,Torreya nucifera, Cycas revoluta, andGinkgo biloba, and III and IV in each of three species of Taxodiaceae, and Cupressaceae. The polar lipids constitute the minor fraction
of seed lipids in general. The content and composition of NMIP acids in these lipids differe considerably from those in neutral
lipids. Analysis of the partial cleavage products of triacylglycerols showed that the NMIP acids distribute mainly in the
1,3-position. |
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