H. Maeda et al., VOLTAMMETRIC BEHAVIORS OF DOPAMINE AND ASCORBIC-ACID AT A GLASSY-CARBON ELECTRODE ANODIZED IN 1,OMEGA-ALKANEDIOL, Analytical sciences, 11(6), 1995, pp. 947-952
The voltammetric behaviors of dopamine (DA) and ascorbic acid (AA) at
a glassy carbon (GC) electrode anodized in 1, omega-alkanediol were ex
amined. On cyclic voltammetry (CV) at a 1,5-pentanediol-modified GC el
ectrode, the electrode process of AA was totally depressed, while DA s
till showed an anodic peak. Although similar phenomena were observed a
t a GC electrode anodized in 1,3-propanediol or 1,4-butanediol, the 1,
5-pentanediol-modified electrode suppressed the anodic peak of AA most
strongly. The voltammetric response of DA at the modified electrode w
as enhanced by the presence of AA, and the extent was controllable by
a proper selection of the sweep rate. Thus, the electrochemical detect
ion of DA with high sensitivity was achieved through CV with 0.1 V s(-
1) at the modified electrode by adding excess AA, while electrochemica
l discrimination of DA from excess AA was realized at 20 V s(-1).