Abstract
1.1. Monoenoic fatty acids (16:1, 18:1, 20:1) were isolated from total brain lipids of fetal, newborn, and adult rats, individual brain phospholipids and the 1 and 2 positions of choline and ethanolamine brain phosphoglycerides of newborn and adult rats, and from total lipids of ox-brain grey and white matter.2.2. Isomer composition was determined by periodate-permanganate oxidation of the double bond and by gas-liquid chromatography of dicarboxylic acid fragments.3.3. The major isomers of 16:1 [(n-10), (n-9), (n-7) and (n-5)], 18:1 [(n-10), (n-9) and (n-7)] and 20:1 [(n-11, (n-9) and (n-7)] were similar in number in all lipids examined, but proportions varied with age, phosphoglyceride type, and position in the phosphoglyceride.4.4. It is suggested that enzymes which control fatty-acid composition of complex lipids in brain can discriminate between these isomers on the basis of doublebond position.
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