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(A) Cyclic voltammograms of (a) bareGCE, (b) Au/GCE, (c) Ab1/Au/GCE, (d) BSA/Ab1/Au/GCEin pH 7.0 0.1 M PBS containing 1 mM hydroquinone. (B) Cyclic voltammograms of electrochemical immunosensor incubated with different concentration of antigen, (a) 0 ng/mL, (b) 20 ng/mL, (c) 50 ng/mL, and then incubated with signal antibody, in pH 7.0 0.1 M PBS containing 1 mM H2O2 and 1 mM hydroquinone.
