Abstract
The lipid content and composition of highly purified preparations of bovine retinal outer segment fragments are given. Almost half of the retinal outer segment fragments is lipid on a weight basis; most of the lipid is phospholipid. Phosphatidylethanolamine, phosphatidylcholine and phosphatidylserine are the major retinal outer segment phospholipids, although small but significant amounts of phosphatidylinositol and sphingomyelin are also present. The retinal outer segment fatty acids contain an unusually high concentration (approx. 50%) of highly unsaturated long-chain fatty acids. The predominant fatty acid, docosahexaenoic acid (22:6), accounts for 37% of the fatty acids; docosatetraenoic acid (22:4), 7% and arachidonic acid (20:4), 8%. Palmilic acid (16:0) and stearic acid (18:0), the most abundant saturated fatty acids, account for at least 10 and 16%, respectively.
Published Version
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