Abstract
Alteration of the chemical composition of the stationary liquid as a method of facilitating the analysis of higher fatty acid esters by gas-liquid chromatography was studied. A distinct relationship was noted to exist between the relative solubility of the saturated and unsaturated acid ester vapors in a particular stationary liquid and the chemical composition of the liquid phase. When sebacate or azelate polyesters of diethylene glycol were employed as liquid phases, the separation of linoleate from linolenate was easily accomplished; however, the stearate and oleate bands were frequently indistinguishable. A variety of high molecular weight, more polar alkyd resins made from shorter chain dibasic acids were found to provide more rapid and superior separations of the biochemically important saturated and unsaturated acid esters. By using columns containing Celite 545 coated with a succinate polyester of diethylene glycol at 200°C it was possible to separate the individual components of mixtures of saturated and unsaturated esters ranging from C 12 to C 26 within 38 min.
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