Abstract
A method is presented for the systematic determination of mono fatty acid estens of propylene glycol (PE), glycerol (GE), sorbitan (SE) and sucrose (SuE).The above-mentioned emulsifiers were extracted from foods with tetrahydrofuran. The extract was purified by silica gel column chromatography. Di-, triglyceride and other nonpolar substances were washed out with ether-chloroform mixture (1:99), then PE, GE and isosorbide monoesters (SE) were eluted with methanol-chloroform mixture (5:95) and sorbitan monoesters (SE) and SuE were eluted with methanol. These separated emulsifiers were converted to their trimethyl silyl ether derivatives and determined by gas chromatography.The recoveries of PE, GE and SE added to ice cream, margarine, soy-milk, pudding-powder, and cake-powder at the level of 0.1% were more than 90.0%. Those of SuE were 38.6-98.0%. The detection limits were 10ppm for PE and GE, and 50ppm for SE and SuE.
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