Figure 6.

Cathodic linear sweep voltammograms of AgCl at the gold–carbon composite electrode (GCCE); black line—without the antigen immobilized on the immunosensor surface; coloured lines—antigen immobilized on the electrochemical immunosensor with the different concentration of antibodies (50, 100, 400, 800, 1600 IU·mL⁻¹). Inset plot: corresponding calibration curve (error bars for n = 5, P = 0.95) in supporting electrolyte of 0.15 mol·L⁻¹ HNO₃ and 0.01 mol·L⁻¹ KCl. Scan rate of 100 mV·s⁻¹, E_acc = −0.8 V, t_acc = 60 s.