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Citation: SUN Deng-Ming, MA Wei, WU Yun. Preparation of Poly(L-isoleucine) Modified Electrode and Cyclic Voltammetric Determination of Dopamine[J]. Chinese Journal of Applied Chemistry, ;2006, 23(11): 1214-1217. shu

Preparation of Poly(L-isoleucine) Modified Electrode and Cyclic Voltammetric Determination of Dopamine

1.
Department of Chemistry, Huaibei Coal Normal College, Huaibei 235000

Corresponding author: SUN Deng-Ming,
Received Date: 29 November 2005
Available Online: 20 February 2006
Fund Project: 安徽省教育厅自然科学基金(2004KJ320) (2004KJ320)淮北市科技计划基金(040145)资助项目 (040145)

Poly(L-isoleucine) modified glassy carbon electrode was successfully was prepared.The electrochemical behavior of dopamine studied at the poly(L-isoleucine) modified electrode and a cyclic voltammetric determination method for dopamine has been set up.In pH=7.5 phosphate buffer solution,a couple of redox peaks was observed by cyclic sweeping between -0.4 V and 0.6 V at 250 mV/s with the peak potential E_pa=0.206 V and E_pc=0.104 V(vs Ag/AgCl),respectively.The peak current is proportional to the concentration of dopamine,the linear range for the determination of dopamine is from 1.0×10^-8 to 5.0×10^-4 mol/L.The detection limit is 5.0×10^-9 mol/L.The relative standard deviation is 3.2%(n=9,5.0×10^-5 mol/L dopamine).The method was applied to the determination of dopamine in medicine with satisfactory results.
- polymer modified electrode,
- L-isoleucine,
- dopamine,
- cyclic voltammetry
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