Abstract
PREVIOUS work1 has suggested that the presence of double bonds at the 6–7, 9–10 positions, counting from the terminal CH3-group, is fundamental for the biological activity of essential fatty acids. This ‘6 : 9-(term.)’-hypothesis has directed attention to the highly unsaturated long-chain fatty acids from brain glycero-phosphatides1. According to Klenk2, the C20 fatty acids of these phosphatides should contain two C 6,9-(term.)-acids, namely, C 11,14-eicosadienoic acid and arachidonic acid. The latter has long been recognized as an essential fatty acid, and, more recently, the former has appeared to be also active1. In the C22-fraction of the brain glycero-phosphatides, six different fatty acids should occur, three possessing the 6,9-(term.)-configuration. Later, Klenk2 succeeded in verifying the presence of these three 6,9-(term.)-acids by isolation and identification:
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