A Convenient Trimethylchlorosilane Rinse-Coating Procedure for Rapid Microemulsion Capillary Electrokinetic Chromatography with Photo Diode Array Detection of Melamine and Sodium Benzoate

摘要

A convenient trimethylchlorosilane rinse-coating procedure was studied for microemulsion capillary electrokinetic chromatography with photo diode array detection for the first time and a new method based the coating was developed for rapid simultaneous determination of melamine and sodium benzoate. In the tested ranges, good linear relationships between peak heights and concentrations were observed (correlation coefficients for melamine and sodium benzoate were 0.9995 and 0.9959, respectively) and the relative standard deviations (n = 5) of migration time were 0.68 % for melamine and 0.71 % for sodium benzoate, respectively. The detection limits for melamine and sodium benzoate were 0.06 and 0.02 mg/L, respectively. All peaks appeared less than 2 min under optimized conditions.