Figure 5

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