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Citation: LIANG Ru-Ping, QIU Jian-Ding, ZOU Xiao-Yong, CAI Pei-Xiang. Sol-gel-coated Electrocatalytic Dopamine Sensor Based on L-Lysine Incorporated Nafion Film[J]. Chinese Journal of Applied Chemistry, ;2003, 20(4): 346-350. shu

Sol-gel-coated Electrocatalytic Dopamine Sensor Based on L-Lysine Incorporated Nafion Film

1.
a School of Chemistry and Chemical Engineering, Sun Yat-sen(Zhongshan) University, Guangzhou 510275;
2.
b Department of Chemical Engineering, Pingxiang College, Pingxiang

Corresponding author: CAI Pei-Xiang,
Received Date: 18 September 2002
Available Online: 31 December 2002
Fund Project: 广东省自然科学基金资助项目(011105) (011105)

The dopamine (DA) electrocatalytical sensor is prepared from a Nafion film coated platinum electrode by immersing it in L-lysine solution,and coated with SiO₂ sol-gel layer.The L-lysine is immobilized via electrostatic force between the cation of Lys and the negatively charged sulfonic acid groups in Nafion film.Cyclic voltammetry (CV) is used to investigate the electrochemical characteristics of the sensor.The linearity of DA concentration in the range of 5.0×10^-7~5.0×10^-4 mol/L with detection limit of 5.0×10^-8 mol/L and the correlation coefficient of 0.999 are obtained by differential pulse voltammetry (DPV).No interference was found from ascorbic acid,nitrite,uric acid,glucose and L-arginine in the determination of DA.The sensor is stable for about 4 weeks in a dry state at 4℃.Satisfactory determination results of DA in samples are obtained by this method.
- SiO₂ sol-gel,
- L-lysine,
- nafion,
- electrocatalytical dopamine sensor,
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