Analysis of phospholipids in porcine, bovine and rat adipose tissue revealed a relatively high level of plasmalogens (O‐alk‐1‐enyl lipids). About 50% of the ethanolamine phospholipids in the pig and beef samples consisted of alk‐1‐enylacylglycerophosphorylethanolamine, and the corresponding value for the rat sample was near 35%. In the ethanolamine and choline phospholipid fractions, theO‐alk‐1‐enyl moieties were almost exclusively 16∶0, 18∶0 and 18∶1, whereas the acyl moieties had chain lengths ranging from 16 to 22 carbon atoms with a high degree of unsaturation.
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Grigor et al. (1972) studied this question.