Since the conception of a microchip-based capillary electrophoresis (CE) system was described, the number of research laboratories developing microchip CE devices has increased dramatically. Miniaturized CE analysis systems have brought numerous advantages of working over large-scale analyzers, including fast analysis, high efficiency, low reagent consumption, and portability. Therefore, microchip systems offer great promise for important applications, such as environmental or industrial monitoring and clinical diagnostics [1–4]. Electrochemical detection is ideally suited for miniaturization, compatible with modern microfabrication and offers high selectivity and sensitivity [5,6].