| Abstrakt: |
Triacylglycerols were isolated from an African peanut oil, then fractionated by unsaturation into classes, and the triacylglycerol structure was determined on these classes using pancreatic lipase hydrolysis. Fatty acid analysis of monoacylglycerols and, in some cases, of 1 or 2 classes of diacylglycerols, allowed the proportions of 84 isomers to be calculated. The oil had a high oleic acid content (60.3%) and contained nearly 25% of trioleoylglycerol, the major triacylglycerol. The 4 most abundant isomers together represented more than one-half of the total triacylglycerols. In 30 isomers, the 2-position was occupied by linoleic acid, and in 39 isomers, by oleic acid. The very long-chain saturated fatty acids (20:0, 22:0, 24:0) that formed 5.1% of the fatty acid content of the oil, were not found in the 2-position. In most cases, each was associated with 2 molecules of an unsaturated fatty acid. The placement of fatty acids, respectively, at the 1,3-position and the 2-position was relatively close to a l,3-random-2-random distribution, except for trioleoylglycerol (24.7% instead of 21.7% by the random hypothe-sis). [ABSTRACT FROM AUTHOR] |
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