Capillary electrophoresis analysis of isoniazid using luminol-periodate potassium chemiluminescence system

A rapid and simple capillary electrophoresis method coupled with chemiluminescent (CL) detection was proposed for analysis of isoniazid (ISO) based on the enhancement effect of ISO to CL emission of luminol-periodate potassium reaction. Under the optimal conditions, ISO can be assayed in the range of 7.0 × 10 −7 to 3.0 × 10 −5 g mL −1 ( R 2 = 0.9990) with a limit of detection of 3.0 × 10 −7 g mL −1 (signal-to-noise ratio of 3). The whole analysis process can be completed within 2.5 min with a theoretical plate number of 6258. The relative standard deviations of the signal intensity and the migration time were 3.1 and 1.4% for a standard sample at 1.0 × 10 −5 g mL −1 ( n = 5), respectively. The presented novel strategy was successfully applied to the determination of ISO in commercial pharmaceutical preparations and spiked human serum samples. Copyright © 2010 John Wiley & Sons, Ltd.