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Citation: LI Yunlong, SU Zhaohong, CHEN Chao, MENG Yue, XIE Qingji. Electroanalysis of Dopamine at Polydopamine/Multiwalled Carbon Nanotubes/Glassy Carbon Electrode[J]. Chinese Journal of Applied Chemistry, ;2011, 28(9): 1046-1051. doi: 10.3724/SP.J.1095.2011.00568 shu

Electroanalysis of Dopamine at Polydopamine/Multiwalled Carbon Nanotubes/Glassy Carbon Electrode

1.
Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research(Ministry of Education), Hunan Normal University, Changsha 410081

Corresponding author: XIE Qingji,
Received Date: 27 September 2010
Available Online: 17 January 2011
Fund Project: 国家自然科学基金(21075036,90713018) (21075036,90713018)湖南省教育厅科研(10C0927)资助项目 (10C0927)

On the basis of electropolymerization of dopamine(DA) at multiwalled carbon nanotubes(MWCNTs) modified glassy carbon(GC) electrodes, polydopamine(PDA)/MWCNTs/GC electrodes were prepared and characterized by electrochemical impedance spectroscopy(EIS) and cyclic voltammetry(CV). The electrode exhibited well-defined electrochemical behavior of DA in pH=7.4 phosphate buffer, producing higher oxidation currents than those on a bare GC electrode, and the direct electrochemical responses of 2.0 mmol/L ascorbic acid(AA) or K₄Fe(CN)₆ were inhibited, demonstrating the nano-enhancement effect of MWCNTs and the anti-anion electroanalysis selectivity due to use of the PDA film with the selective cationpermeability nature. DA electroanalysis was conducted at the electrode using CV and semi-derivative methods. The semi-derivative voltammetric peak height for DA oxidation is linear with DA concentration in the range of 0.08~1.76 μmol/L, and the linear regression equation in a phosphate buffer solution without AA or with 0.5 mmol/L coexisting AA is i_pa-sd(μA/s^1/2)=0.107+0.405c(μmol/L)(r²=0.986) or i_pa-sd(μA/s^1/2)=0.628+0.649c(μmol/L)(r²=0.992), both with detection limits of 8.0×10^-8 mol/L(S/N=3). This method was used for rapid determination of DA in a DA hydrochloride injection sample with satisfactory results.
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