The fatty acids of phosphatidylethanolamine and phosphatidylcholine from hen's egg

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Abstract
Gas-liquid chromatographic analysis has revealed marked differences in the fatty acid composition of egg-yolk phosphatidylethanolamine and phosphatidylcholine. Of the total acids in phosphatidylethanolamine 39.5% is saturated C18 and 20.1% is unsaturated C18, whereas in phosphatidylcholine 14.2% is saturated C18 and 44.7% is unsaturated C18- The larger proportion of unsaturated C18 acid in phosphatidylcholine is attributed to oleic acid. About 3/5 of the total acids of phosphatidylethanolamine are saturated, and it is estimated that 1/3 of the fatty acids esterified in the a position are saturated. Considerably more C20 and C22 unsaturated acids are present in phosphatidylethanolamine than in phosphatidylcholine.