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Citation: MA Zeng-Yan, LI Jiang-Yuan, XIANG Wei. Electrochemical Behavior of Dopamine at Poly(L-cysteine)/Mutil-walled Carbon Nanotube Modified Electrode and Its Voltammetric Determination[J]. Chinese Journal of Applied Chemistry, ;2009, 26(2): 224-228. shu

Electrochemical Behavior of Dopamine at Poly(L-cysteine)/Mutil-walled Carbon Nanotube Modified Electrode and Its Voltammetric Determination

1.
Laboratory of Applied Chemistry and Pollution Control Technology, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002

Corresponding author: LI Jiang-Yuan,
Received Date: 28 December 2007
Available Online: 25 March 2008
Fund Project: 四川省教育厅重点科研基金(2004A106)资助项目 (2004A106)

A poly(L-cysteine)/multi-walled carbon nanotube composite(poly-L-cys/MWNT) modified electrode was fabricated by electropolymerization of L-cysteine on a glassy carbon electrode with multi-walled carbon nanotube as dopant.The electrochemical behavior of dopamine(DA) at the modified electrode was studied.The experiment results show that the modified electrode exhibited strong electrocatalytic activity on the oxidation of DA,and the electrode reaction of DA was a quasi-reversible process controlled mainly by adsorption.The oxidation peak current increased linearly with the concentration of DA in a range of 80～0.08 μmol/L.The detection limit was 0.02 μmol/L.Common impurities have no effect on the determination of DA.The modified electrode was applied to assessing the contents of DA in dopamine hydrochloride injection with a recovery of 98%～104%.
- dopamine,
- L-cysteine,
- multi-walled carbon nanotube,
- modified electrode
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