Carbon fiber bundle–Au–Hg dual-electrode detection for capillary electrophoresis

The assembly of a dual-electrode amperometric detection system for capillary electrophoresis is developed. The dual-electrode detector consists of different kinds of electrode material (carbon fiber and Au–Hg). The dual-electrode is placed on the outlet end of the separation capillary. Cysteine, glutathione, ascorbic acid and uric acid can be detected simultaneously and selectively at the two electrodes of the dual electrode, respectively. The capillary electrophoresis–dual-electrode detection system has be used to determine these compounds in human blood samples.