1887

Abstract

Each of the four main polar lipids from UTEX 640, monogalactyosyldiacylglycerol (MGDG), digalactosyldiacylglycerol (DGDG), sulphoquinovosyldiacylglycerol (SQDG) and phosphatidylcholine (PC), was separated into its molecular species by reverse-phase HPLC, and the positional distribution of fatty acids in each species was determined. Numbers of separated peaks in each lipid class were: MGDG, 10; DGDG, 7; SQDG, 10; and PC, 11. Eicosapentaenoic acid (EPA) was present in 20 of the 45 molecular species but predominated in the MGDG and DGDG classes, where 13 of the proposed structures contained EPA. EPA was always located in the position except in two lipid species, MG5 and PC2, where it was present at both the and locations. The predominant polar lipid molecular species found in UTEX 640 were (mg total fatty acids per g dry weight of biomass) 20:5–16:4–MG, 41·2; 20:5–16:1–DG, 21·0; 16:1–16:1–SQ, 18·2; and 20:5–16:1–MG, 18·0. [Structure indicates fatty acid at position - fatty acid at position-carbohydrate component at position of the glycerol molecule. Abbreviations: 20:5, EPA; 16:4, hexadecatetraenoic acid; 16:1, palmitoleic acid; MG, monogalactose; DG, digalactose; SQ, sulphoquinovose.]

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1993-03-01
2021-05-13
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