The Reaction Kinetics of Glutathione Capped Quantum Dots for the Detection of Hydrogen Peroxide

Glutathione capped cadmium tellurium quantum dot was investigated as the fluorescence probe for the detection of hydrogen peroxide. In this detection regime, we regard QDs as only the signal transducer for the pseudo first-order reaction between hydrogen peroxide and glutathione. In this way the relationship between the rate of QD fluorescence decay and the rate of change in hydrogen peroxide concentration during the reaction were established and experimentally validated. Hence, the rate constants for the reaction were evaluated. The application of kinetic measurement to chemical analysis was presented and the results were comparable to those obtained from normal measurement at equilibrium.