Onthe first cyclic positive-going
voltammogram scan, Fig. 1A was recorded from 0.5to þ1.4V(vs.
EAg/AgCl) at ascan rate of 50mVs1, and two consecutive oxidations peaks were observed in the anodic region,P1 at Ep1
Eþ0.85 VandP2 at Ep2Eþ1.25V,which agree with the SW
([tryptamine]¼2.0104 mol L1), and DP voltammograms
([tryptamine]¼8.3105 mol L1) shown in Figs. 1B and 3A respectively