971942.fig.0011a
(a)
971942.fig.0011b
(b)
Figure 11: Electrochemical impedance spectra of the acetylcholine with the AChE-ChOx-modified biosensor based on a SPE in 0.1 M PBS (pH = 7.0) containing 1.0 mM K3Fe(CN)6/K4Fe(CN)6 and calibration curve.