Determination of petroselinic acid in Umbelliflorae seed oils by combined GC andC NMR spectroscopy analysis.

Synthetic triolein and tripetroselinin mixtures were examined byC NMR spectroscopy, showing marked chemical shift differences of the olefinic carbon atoms. Peak height ratios were compared to weight values for quantitative determination of oleic and petroselinic acids in seed oils, since these two fatty acids are quantitated together by GC analysis. Values observed for NMR peak height ratios were fairly close and agreed well with weight ratios. From overall compositions of eleic and petroselinic acids obtained by GC and relative compositions given byC NMR, petroselinic acid has been determined in ten Umbelliflorae seed oils. [ABSTRACT FROM AUTHOR]