STRUCTURE OF PEANUT OIL TRIACYLGLYCEROLS FROM CULTIVARS OF DIVERSE GENETIC BACKGROUND

Triacylglycerols (TG) were isolated from peanut cultivars chosen to embrace known extremes in oleic and linoleic acid content, and the TG structure were determined using pancreatic lipase hydrolysis. Molar concentrations of oleic and linoleic acid in sn-2-monoacylglycerols (MG) were highly correlated with molar concentrations in TG. Correlation coefficients were 0.99 in each case. Molar concentrations of oleic and linoleic in 2-MG are given by: MG18:1=1.37TG18:1-20.8; MG18:2=1.71TG18:2+0.66. Linoleicoleic ratios ranged from 0.2-1.1 for TG, 0.2-2.6 for sn-2-MG, and 0.2-0.6 for acids in the 1(3)-positions of TG. Molar concentrations of linoleic acid in the 1(3)-positions of TG ranged from 7-26%. The linoleic-oleic ratios and molar concentrations of 1(3) linoleic acid in some cultivars were similar to values that have been reported for relatively nonatherogenic corn oil and randomized peanut oil. © 1979 The American Oil Chemists' Society.