Studies on analysis of emulsifiers in cosmetics. Systematic analysis of four esters in non-ionic surfactants.:Systematic Analysis of Four Esters in Non-ionic Surfactants

概要

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A method is presented for the systematic determination of mono fatty acid esters of propylene glycol (PE), glycerol (GE), sorbitan (SE) and sugar (SuE).The emulsifiers were extracted from freeze-dried cosmetics with tetrahydrofuran. The extractant was purified by silica gel column chromatography and separated into two fracions, PE, GE and isosorbide monoesters (SE) were eluted by 5% methanol/chloroform and sorbitan monoesters (SE) and SuE were by methanol. Separated emulsifiers were converted to their trimethyl silyl ether derivatives and mono stearates of each emulsifiers were determined by gas chromatography.The recoveries of four emulsifiers added to cream, cleansing cream, lotion and cleansing lotion at the level of 0.1% were more than 82.5%. The detection limits were 10ppm for PE and GE, 50ppm for SE and SuE.
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