Determination of ephedrine and codeine in human urine by cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography

A sensitive method for the determination of ephedrine and codeine in human urine by capillary electrophoresis （CE） was described. In order to improve the sensitivity, two online concentration techniques including cation-selective exhaustive injection （CSEI） and sweeping micellar electrokinetic chromatography （sweeping-MEKC） were used. Under the optimum conditions, the detection limits （S/N = 3） were 0.10 μg/L for ephedrine and 0.80 μg/L for codeine. This method was successfully applied to real urine sample analysis.

阳离子选择性耗尽进样-胶束电动色谱法对可非糖浆中盐酸异丙嗪与磷酸可待因的测定

在胶束电动色谱法的基础上，联用阳离子选择性耗尽进样技术，对盐酸异丙嗪和磷酸可待因同时测定的方法进行了研究。考察了pH值、有机溶剂、SDS浓度、进样时间、进样电压等实验条件对分离效果的影响。最佳实验条件为：缓冲体系16％乙腈＋80mmol／LSDS＋20mmol／LNaH2PO4（pH2．4），分离电压为-18kV，测量波长214nm，萃取液pH2．4，进样电压10kV，进样时间100s。在优化实验条件下，两种物质在8min内出峰，峰面积RSD不大于4．6％。盐酸异丙嗪、磷酸可待因的线性范围分别为0．50．81．3、0．78～62．5μg／L，检出限分别为0．16、0．12μg／L，相关系数分别为0．9989、0．9988。将方法用于可非糖浆中盐酸异丙嗪与磷酸可待因的测定，回收率为96％～106％。