Figure 4

Differential pulse voltammogram and corresponding calibration curve of (A,B) PSA-Aptamer and (C,D) Anti-PSA modified electrodes in the presence of different concentration of PSA (0 to 11.06 ng mL⁻¹ as shown here as ‘a’ to ‘j’) in PBS (pH 7.4) with 5 mM [Fe(CN)6]^3−/4−.