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- W1495274508 abstract "Groups of rats bearing Morris minimal deviation hepatoma 7288CTC were fed a fat-free diet supplemented with either 0.5% safflower oil (diet A), 15% safflower oil or free acids (diets Band C), or 15% safflower oil or free safflower fatty acids (diet D) for 4 weeks. A group of normal rats was also fed diet D. Triglycerides, cholesteryl esters, phosphatidylcholines, and phosphatidylethanolamines isolated from livers and hepatomas of animals on each diet were analyzed quantitatively for positional isomers in the cis- and trans-octadecenoate fractions. When sufficient samples could be obtained, the cis- and trans-hexadecenoate fractions were also analyzed. Plasma from normal rats on diet D was analyzed in the same manner. The octadecenoate fractions of all hepatoma and liver lipid classes from animals fed diets A, B, and C were greater than 95% the cis isomers. Trans isomers accounted for approximately 15, 30, 50, and 70% of the octadecenoate fractions isolated from liver triglycerides, cholesteryl esters, phosphatidylcholines, and phosphatidylethanolamines, respectively, of animals fed diet D. In contrast, all hepatoma lipid classes from animals on diet D contained the same approximate percentage of trans isomers (15 to 20%). Oleic and vaccenic acids were the major positional cis-octadecenoate isomers of all liver and hepatoma lipid classes from animals fed diets A, B, and C. The ratios of oleic to vaccenic, unaffected by diets A, B, and C, differed for each lipid class in liver, but the ratios were similar for the two hepatoma neutral lipid classes and for the two phospholipid classes. The cis-octadecenoate fractions from all liver and hepatoma lipid classes of animals fed diet D consisted predominantly of the delta9, delta11, and delta12 isomers. The cis delta10 isomer, which was a major isomer of the diet, was almost excluded from liver, hepatoma, and plasma lipids. The positional isomers of the trans-octadecenoate fractions from liver and hepatoma triglycerides and cholesteryl esters exhibited the same approximate distribution as the trans fatty acids of diet D. In contrast, the 10-trans-octadecenoate, like 10-cis-octadecenoate, was almost excluded from the phospholipids of liver and plasma. Unlike liver, the hepatoma phospholipids contained 10-trans-octadecenoate at approximately half the percentage of neutral lipids. Because diet D contained no hexadecenoic fatty acids, the occurrence of trans-hexadecenoate isomers in liver and plasma lipids indicated a chain shortening process. Predominance of the 8-trans-hexadecenoate isomer indicated a preference of the 10-trans-octadecenoate isomer for chain shortening." @default.
- W1495274508 created "2016-06-24" @default.
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- W1495274508 date "1977-03-01" @default.
- W1495274508 modified "2023-10-17" @default.
- W1495274508 title "Incorporation of dietary cis and trans isomers of octadecenoate in lipid classes of liver and hepatoma." @default.
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- W1495274508 doi "https://doi.org/10.1016/s0021-9258(18)71851-6" @default.
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