367872.fig.003a
(a)
367872.fig.003b
(b)
Figure 3: (a) Cyclic voltammograms of (A) p-AP-Au electrode, (B) p-AP+GA-Au electrode, and (C) antibody modified Au-p-AP+GA-Au electrode, recorded in the presence of Fe as a redox probe at scan rate of 100 mV/s. (b) Nyquist plots of impedance spectra of (A) Au-p-AP, (B) with Au-p-AP+GA, and (C) with antibody modified Au-p-AP+GA, recorded in the presence of Fe at a frequency range between 0.1 Hz and 100 kHz at open circuit potential.