Polyunsaturated Fatty Acids and Betaine Lipids fromPavlova lutheri

摘要

The polar lipids and fatty acids of the microalgaePavlova lutheriwere analyzed. The principal polar lipid components were monogalactosyldiacylglycerol (MGDG), digalactosyldiacylglycerol (DGDG), sulfoquinovosyldiacylglycerol (SQDG), 1,2-diacylglyceryl-O-2′-hydroxymethyl-(N,N,N-trimethyl)-rβ-alanine (DGTA) and 1,2-diacylglyceryl-3-O-carboxyhydroxymethylcholine (DGCC). Each polar lipid had a different set of combinations of fatty acids, the most characteristic feature being the localization of polyunsaturated fatty acids in the betaine lipids. The percentages of polyunsaturated fatty acids in DGTA and DGCC were 70and 50, respectively, and these fatty acids were localized at the C-2 position in the betaine lipids. An analysis of the incorporation of14C-labelled compounds into the algal cells indicated the involvement of DGCC in acyl exchan