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Citation: HAN Xiao-Xia, GAO Zuo-Ning. Electrochemical Behavior of Dopamine and Ascorbic acid at CPB/CPE and Its Application[J]. Chinese Journal of Applied Chemistry, ;2007, 24(7): 770-773. shu

Electrochemical Behavior of Dopamine and Ascorbic acid at CPB/CPE and Its Application

HAN Xiao-Xia ,
GAO Zuo-Ning ^,

1.
Ningxia Key laboratory of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021

Corresponding author: GAO Zuo-Ning,
Received Date: 19 August 2006
Available Online: 16 September 2006
Fund Project: 教育部科学研究重点项目(204149) (204149)宁夏高等学校科学研究基金项目(2006)资助 (2006)

The electrochemical behavior of Dopamine (DA) and Ascorbic Acid (AA) at both carbon paste electrode (CPE) and in situ CPB modified carbon paste electrode (CPB/CPE) was investigated.On the surface of CPB/CPE electrode,owing to the electrostatic interaction of CPB and negatively charged AA,the oxidation peak potential shifted more negatively and the peak current increased.On the other hand,the positively charged DA was repelled from the electrode surface and the oxidation peak potential shifted more positively and the peak current decreased.The anodic potential difference between AA and DA is about 340 mV,and AA does not interfere with the electroanalytical determination of DA at CPB/CPE.Linear calibration curves were obtained for both AA and DA in a concentration range of 1.0×10^-5~5.0×10^-3 mol/L.The detection limit of DA in the presence of AA 100- fold that of DA was 2.0×10^-6 mol/L.The CPB/CPE was used to determine DA in dopamine injection samples spiked with AA.
- ascorbic acid,
- dopamine,
- cetylpyrid bromide,
- carbon paste electrode,
- in situ modification
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