Endogenous phospholipids of swine liver: effect of fat deprivation on molecular species of phosphatidylcholine and phosphatidylethanolamine.
Three 1-yr-old swine and two 2.5-wk-old swine were fed a fat-free diet for 1 month and 5 months, respectively. The hepatic phosphatidylcholine and phosphatidylethanolamine were fractionated by silver ion thin-layer chromatography. A distinctive feature of the chromatographic procedure was the development of the chromatograms at low temperatures: -10 degrees C for phosphatidylcholine and 4 degrees C for phosphatidylethanolamine. The chromatographic fractions were hydrolyzed with phospholipase A(2), and the fatty acids were characterized. Significant concentrations of odd-chain saturated and unsaturated fatty acids were found in the swine deprived of fat for 5 months. The major molecular species of phosphatidylcholine in both groups contained monoenoic fatty acids: 16:0/18:1(n - 9), 18:0/18:1(n - 9), and 18:1(n - 9)/18:1(n - 9). Their concentrations changed only slightly with the diet. The molecular species of phosphatidylethanolamine were more sensitive to dietary changes. In the swine deprived of fat for 1 month, about 50% of the molecular species of phosphatidylethanolamine contained tetraenoic fatty acids: 16:0/20:4(n - 6), 18:0/20:4(n - 6), and 18:1(n - 9)/20:4(n - 6). The phosphatidylethanolamine of animals deprived of fat for 5 months contained only 3% molecular species with tetraenoic acids, 18:0/20:4(n - 6), but 36% molecular species with trienoic acids: 18:0/20:3(n - 9), 18:1(n - 9)/20:3(n - 9), 18:0/19:3(n - 8), 16:0/20:3(n - 9), and 17:0/20:3(n - 9). Doubly unsaturated species, such as 18:1(n - 9)/18:1(n - 9), 18:1(n - 9)/20:3(n - 9), and 18:1(n - 9)/20:4(n - 6), were found in both groups of swine, although their total concentrations were higher in the group deprived of fat for a longer period.
D000818:Animals; D002852:Chromatography, Ion Exchange; D002855:Chromatography, Thin Layer; D004041:Dietary Fats / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism; D007536:Isomerism; D008099:Liver / Q000378:metabolism*; D010713:Phosphatidylcholines / Q000302:isolation & purification / Q000378:metabolism*; D010714:Phosphatidylethanolamines / Q000302:isolation & purification / Q000378:metabolism*; D010740:Phospholipases; D010743:Phospholipids / Q000378:metabolism*; D012834:Silver; D013552:Swine; D013997:Time Factors
D004041:Dietary Fats; D005227:Fatty Acids; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D010743:Phospholipids; D012834:Silver; D010740:Phospholipases