Rapid Determination of Ethyl Laurate from Supercritical Ethanol-Carbon Dioxide Transesterification by Full Evaporation Headspace Gas Chromatography

摘要

This paper reports on a full evaporation headspace gas chromatography (FE HS-GC) technique for rapid determination of the ethyl laurate content in supercritical ethanol-carbon dioxide mixtures. The data show that, at an equilibration temperature of 150 ℃, with a small volume (up to 75 μL) of sample, the full evaporation of ethyl laurate can be achieved in 3 min. The method had a relative standard deviation of less than 5.5% in replicate measurements; the limit of quantification (LOQ) was 26.0 μg; and the recovery ranged from 96 to 105%. The method is simple and rapid. It is quite suitable for use in the determination of ethyl laurate or similar compounds in an ethanol-carbon-dioxide-based supercritical reaction system.