VOLTAMMETRIC BEHAVIORS OF DOPAMINE AND ASCORBIC-ACID AT A GLASSY-CARBON ELECTRODE ANODIZED IN 1,OMEGA-ALKANEDIOL

Citation
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
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
0910-6340
Volume
11
Issue
6
Year of publication
1995
Pages
947 - 952
Database
ISI
SICI code
0910-6340(1995)11:6<947:VBODAA>2.0.ZU;2-6
Abstract
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).