Abstract :
A new capillary electrophoresis (CE) method with laser-induced fluorescence (LIF) detection was developed for the rapid separation and sensitive detection of glutathione (GSH) and glutathione disulfide (GSSH) after derivatization by 4-chloro-7nitrobenzo-2-oxa-1,3-diazol (NBD-Cl). The derivatization and separation conditions were investigated in detail and the optimums were obtained. Under the optimum experiment conditions, linear relationships between the peak height and concentrations of the analytes in normal and second-derivative electrophoregrams were obtained (0.22-45.00 (mu)M). The detection limits for glutathione and glutathione disulfide in normal and second-derivative electrophoregrams were 0.046 and 0.012 (mu)M and 0.046 and 0.014 (mu)M, respectively. The method was applied to the analysis of glutathione and glutathione disulfide in human plasma and tobacco leaves with satisfactory results.
