A Fluorescence Detection Scheme for Capillary Electrophoresis of <i>N</i>-Methylcarbamates with On-Column Thermal Decomposition and Derivatization
作者:Yuan Sheng Wu、Hian Kee Lee、Sam F. Y. Li
DOI:10.1021/ac990928d
日期:2000.4.1
conditions, fluorescence detection of 10 NMC compounds was achieved, with column efficiencies typically higher than 50,000 and detection limits better than 0.5 ppm. The present work represents an unprecedented effort in capillary electrophoresis (CE), in which an intact capillary was consecutively utilized as chambers for separation, decomposition, derivatization, and detection, without involving any
本文介绍了胶束电动色谱(MEKC)分离中N-甲基氨基甲酸酯(NMC)农药的荧光检测方法。荧光检测的实现取决于发现季铵盐表面活性剂(尤其是十六烷基三甲基溴化铵,CTAB),除了在MEKC中用作疏水假相外,还能够催化NMC的热分解以释放甲胺。因此,配制了由硼酸盐缓冲液,CTAB和衍生化成分(邻苯二甲醛/ 2-巯基乙醇)组成的多功能MEKC介质,该介质可首先进行常规的MEKC分离,随后进行热分解,最后进行NMC的原位衍生化。通过精心优化操作条件,实现了10种NMC化合物的荧光检测,色谱柱效率通常高于50,000,检测限优于0.5 ppm。本工作代表了毛细管电泳(CE)方面的空前努力,其中完整的毛细管被连续用作分离,分解,衍生和检测的腔室,而没有涉及任何接口功能。与通过反相HPLC进行NMC的传统柱后荧光测定相比,这种检测系统的成功实施使仪器非常简单。在确定CE格式的多种农药和药物时,类似的方案也