Fig. 11. DPVs of various concentrations of (A) DA with fixed concentration of UA (100 μM) and (C) UA with fixed concentration of DA (10 μM) in 0.1 M PBS at pH 7.0 at the PTPCNs/GCE. (A) Concentrations of DA (a–l) are: 1, 3, 5, 10, 20, 25, 30, 40, 50, 60, 75, 100 μM and for (C) concentrations of UA (a–p) are: 5, 7, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200 μM. The corresponding calibration plots (Jpvs. concentration) of DA and UA are shown in (B) and (D).
