Abstract
The molecular phospholipid species of mammary tumors induced by 7,12-dimethylbenz[a]anthracene in rats that were fed diets containing 20 or 3% sunflower-seed oil and different levels of calcium were analyzed by high-pressure liquid chromatography. Twenty-seven molecular species of phospholipids were identified. Phosphatidylcholine was predominantly composed of palmitoyl-arachidonoyl (16:0-20:4) (17-21%), palmitoyl-oleoyl (16:0-18:1) (19-21%), stearoyl-arachidonoyl (18:0-20:4) (12-13%), and 1,2-dipalmitoyl (16:0-16:0) (10-14%) species. The major molecular species of phosphatidylethanolamine were 18:0-20:4 (37-39%) and 16:0-20:4 (10-11%). The composition of diacyl phosphatidylcholine and diacyl phosphatidylethanolamine molecular species from rat mammary tumors was not greatly affected by the different diets.
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