SIMULTANEOUS DETERMINATION OF GLYCEROL, AND MONO-, DI- AND TRIGLYCERIDES IN VEGETABLE OIL METHYL ESTERS BY CAPILLARY GAS CHROMATOGRAPHY

摘要

A gas chromatographic procedure for the simultaneous determination of glycerol, mono-, di- and triglycerides in vegetable oil methyl esters has been developed. Quantitative information about this group of organic contaminants is very important for the quality of these oleochemical products when used as automotive diesel fuel substitutes. Trimethylsilylation of glycerol, mono- and diglycerides, followed by GC using a 10-m capillary column coated with a O.1-mu m film of DB-5 allows the determination of all analytes in a single GC run. Calibration is performed by analysis of standard solutions containing glycerol, mono-, di- and triolein as well as two internal standards, 1,2,4-butanetriol and tricaprin. The recovery of the procedure at different concentration levels and the repeatability of the quantitative results are evaluated. [References: 12]