Effects of ethanol on membrane lipids. II. Changes in the content and metabolism of aldehydrogenic lipids in mouse total liver, mitochondria and microsomes.
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The ethanolamine phosphoglycerides were prepared from lipid extracts of ox and mouse brains by preparative thin-layer chromatography. The cyclic acetal derivatives of the alk-1-enyl groups were made by treating the ethanolamine phosphoglycerides with 1,3-propanediol. The resulting monoacyl glycerophosphoryl ethanolamines were separated from the unchanged ethanolamine phosphoglycerides by preparative thin-layer chromatography. Methyl ester derivatives of the acyl groups from both of these fractions were prepared by alkaline methanolysis. The cyclic acetal and methyl ester derivatives were analyzed by gas-liquid chromatography. Substantial differences were found in the composition of the side chains when the combined alk-1-enyl and acyl side chains of the alk-1'-enyl acyl glycerophosphoryl ethanolamines were compared with the side chains of the diacyl glycerophosphoryl ethanolamines. The side chains from the 1-position of these two ethanolamine phosphoglycerides are different in chain length and unsaturation as well as in chemical bonding. The acyl groups from the 2-position of the alk-1'-enyl acyl glycerophosphoryl ethanolamines were predominantly unsaturated. Therefore, acyl group compositions of the total ethanolamine phosphoglyceride from brain are of limited value and individual types should be analyzed.