摘要
用0 5mol/LKOH乙醇溶液水解脂肪酸甲酯乙氧基化物(FMEO),酯键断裂,其疏水基甲酯化、亲水基硅醚化后分别用气相色谱法测定其组成,并采用峰面积归一化法进行了组分的定量。成功测定了各种FMEO样品的疏水基组成和环氧乙烷(EO)加成数分布,方法简单,重复性好,尤其是对原料为混碳脂肪酸甲酯的FMEO更有意义。
A gas chromatographic (GC) method for the determination of fatty acid methyl ester ethoxylates (FMEO) is described. After hydrolyzed in 0.5 mol/L KOH ethanol solution, ester linkage in FMEO was broken into two parts, i.e., hydrophobic groups and hydrophilic groups, which made feasible for the further derivatization of both groups using appropriate derivatizing agents. Hydrophobic groups were esterified by sulfate acid-methanol mixture and hydrophilic groups were etherified by hexamethyldisilyamine and trimethylchlorosilane prior to GC determination. Quantitative results were obtained by the normalization of peak areas of the chromatograms. Compared with previous methods, this one is simple, quick and has a good reproducibility, especially for FMEOs with hydrophobic groups of mixed chain lengths.
出处
《色谱》
CAS
CSCD
北大核心
2004年第1期84-86,共3页
Chinese Journal of Chromatography
