cis-Vaccenic acid in mango pulp lipids.
Shibahara A., Yamamoto K., Nakayama T., Kajimoto G.
Author Affiliation: Kobe-Gakuin University, Arise, Ikawadani-cho, Nishi-ku, Kobe 673, Japan.
Lipids 21 : 388-394
Abstract : A peak corresponding to a methyl octadecenoate other than oleate was detected on the capillary gas chromatogram of the methyl esters of the pulp fatty acids. The compound, isolated by silica gel and argentation column chromatography, HPLC and argentation TLC, and analysed by IR, NMR and GC-MS, chromatographic separation and oxidative degradation, proved to be cis-vaccenic acid (cis-11-octadecenoic acid). Its concentration in the total octadecenoic acid ranged from 35 to 50% in the pulp of mangoes from Fiji, Mexico, the Philippines and Taiwan. cis-Vaccenic acid was one of the major component fatty acids of the non-polar lipids (mainly triacylglycerols), glycolipids and phospholipids. The glycolipids contained cis-vaccenic acid (20%) in higher concentrations than oleic acid (15%). A trace amount of cis-vaccenic acid (0.5%) was detected in the total lipids of mango seeds. The profile of fatty acid composition of the mango pulp lipids (0.2-0.3% of wet pulp) was characterized by the presence of n-7 acid isomers, cis-vaccenic acid and palmitoleic acid, and unusual mono- and dienoic positional isomers.