971942.fig.009a
(a)
971942.fig.009b
(b)
Figure 9: Electrochemical impedance spectra of the AChE-ChOx-modified biosensor based on a GCE (a) and SPE (b) in 0.1 M PBS buffer (pH = 7.0) containing 1.0 mM K3Fe(CN)6/K4Fe(CN)6.