A method is described for the quantitative analysis of mono-and diglycerides by GLC as their trimethylsilyl derivatives. Glyeeryl monoand di-esters of myristic, palmitie, stearic, and oleic acids are separated by GLC on stainless steel columns, packed with 3% JXR on Gas Chrom Q. Relative response factors for monoglyeerides and diglycerides have been calculated. Analyses of control and commercial mixtures with recoveries of 96 to 101% are reported.
A column chromatographic method has been developed for the quantitative estimation of lactylated glycerides and polyglycerol esters in shortenings. The components are eluted successively with benzene, benzene with 10% ethyl ether, ethyl ether, and ethyl alcohol. Lactylated glycerides eluted along with the corresponding mono- and diglycerides are estimated as lacto-palmitates from their lactic acid content. Polyglycerol esters are quantitatively eluted with ethyl alcohol. Results of analyses of several combinations of emulsifiers in lard and a vegetable shortening yielded recoveries of 94 to 102%.
A procedure is described for the separation, identification, and quantitative estimation of propylene glycol mono‐ and diesters of lauric, myristic, palmitic, stearic, and oleic acids in shortenings and lard containing mono‐ and diglycerides. Lipid classes are separated on a silicic acid column, and individual esters are estimated by gas chromatography. Analyses of several control mixtures and commercial samples are reported. Recoveries for individual components range from 92 to 105%, and total recoveries range from 96 to 100%.
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