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Abstract
Synthetic and naturally occurring diglyceride mixtures were successfully resolved according to their carbon number and degree of unsaturation by gas chromatography on organosilicone-polyester (EGSS-X, ECNSS-M) packings containing low loads of liquid phase. The diglycerides were chromatographed as the trimethylsilyl ethers and acetates. Complete separations and apparently quantitative recoveries were achieved with both types of derivatives within 20–60 min isothermally at 250–270 °C for most diglycerides of the common fatty acids containing 0–6 double bonds per glyceride molecule. The retention times of the acetates were longer than those of the corresponding trimethylsilyl ethers by a period of time equivalent to about four methylene units. The 1,2(2,3)-diglycerides were eluted ahead of the 1,3-diglycerides of comparable molecular weight, unsaturation, and positional distribution of fatty acids.
Published Version
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