The C18 fatty acids of ox plasma lipids

The fatty acid composition of the cholesterol esters, triglycerides, phospholipids, and free fatty acids from the pooled plasma of four grass-fed, maiden heifers was determined by gas-liquid chromatography. Special attention is drawn to the composition of the C18 fatty acids, and particularly to the presence of C18 tri-unsaturated fatty acid as a major component (22.9% w/w) of the acids esterified to cholesterol since workers in other laboratories have not detected this acid in ox plasma cholesterol esters or have found it in only very small amount.