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(a) Schematic diagram of electrochemical immunoreaction for differential pulse voltammetry (DPV) response of oxidation of H2O2 to produce water molecule and oxygen catalyzed by catalase for the detection of CFP10–ESAT6; (b) DPV current response of H2O2 oxidation for immunoassay in the absence and presence of 0.12 µg/mL CFP10–ESAT6 protein in 0.1 M PBS (pH = 7.4) containing 150 µM H2O2.
