Determination of cyclic fatty acids by gas‐liquid chromatography

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Abstract
A method is described to determine cyclic fatty acids in cyclic monomers by gas‐liquid chromatography (GLC), which separates saturated straight‐chain esters from cyclic esters. The content of cyclic esters can be determined by integration of the area on the chromatograph under the cyclic peaks. GLC was applied to cyclic monomers made from linseed oil and from linolenic acid. Samples of both hydrogenated and nonhydrogenated cyclic monomers were analyzed; however, more reliable results were obtained on the hydrogenated samples. The results show a standard deviation of 0.25 for linseed oil and 0.36 for linolenic acid.Accuracy of the analysis was established by comparing data with that obtained by crystallization. The GLC method is approximately three times faster.