Electrocatalytic Oxidation of Glutathione at nano-TiO2-Caffeic Acid Modified Carbon Paste Electrode and Its Electrochemical Determination

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Electrocatalytic Oxidation of Glutathione at nano-TiO2-Caffeic Acid Modified Carbon Paste Electrode and Its Electrochemical Determination

- Electrocatalytic Oxidation of Glutathione at nano-TiO2-Caffeic Acid Modified Carbon Paste Electrode and Its Electrochemical Determination
- Vol. 30, Issue 8, Pages: 897-901(2011)
- 作者机构：
  
  宁夏大学化学化工学院能源化工重点实验室.2.宁夏医科大学高等卫生职业技术学院
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Electrocatalytic Oxidation of Glutathione at nano-TiO2-Caffeic Acid Modified Carbon Paste Electrode and Its Electrochemical Determination. [J]. 30(8):897-901(2011)
DOI：

Electrocatalytic Oxidation of Glutathione at nano-TiO2-Caffeic Acid Modified Carbon Paste Electrode and Its Electrochemical Determination. [J]. 30(8):897-901(2011) DOI：

摘要

研究了还原型谷胱甘肽（GSH）在nano-TiO2-咖啡酸（CFA）复合修饰碳糊电极（nano-TiO2-CFA/CPE）上的电催化氧化行为，并进行了测定。结果表明，GSH在CPE和nano-TiO2/CPE上的直接电化学氧化过程十分迟缓，nano-TiO2-CFA/CPE比CFA/CPE对GSH的电化学氧化具有更好的催化作用。采用循环伏安法（CV）、计时电流法（CA）探讨了GSH在nano-TiO2-CFA/CPE上的电极过程动力学性质。用线性扫描伏安法（LSV）测得催化氧化峰电流与GSH的浓度在9.0×10-6~1.0×10-3 mol·L-1范围内呈良好线性，检出限为8.85×10-7 mol·L-1。将该方法用于市售还原型谷胱甘肽药物含量的测定，结果满意。

Abstract

The electrocatalytic oxidation behaviors and electrochemical determination of glutathione（GSH） were investigated at nano-TiO2-caffeic acid modified carbon paste electrode（nano-TiO2-CFA/CPE）.The experimental results indicated that GSH showed a very poor electrochemical response at CPE and nano-TiO2/CPE,but GSH at nano-TiO2-CFA/CPE exhibited a better electrocatalytic activity than that at CFA/CPE.The kinetic properties of GSH were discussed at nano-TiO2-CFA/CPE by cyclic voltammetr（CV）and chronoamperometry（CA）.The catalytic oxidation peak current of GSH versus its concentration had a good linear relationship in the concentration range of 9.0×10-6 -1.0×10-3 mol·L-1 with a correlation coefficient of 0.997 5,and a detection limit of 8.85×10-7 mol·L-1 by linear sweep voltammetry（LSV）.The method was applied in the determination of GSH contents in real samples with satisfactory results.

关键词

谷胱甘肽nano-TiO2咖啡酸碳糊修饰电极电催化氧化电分析方法

Keywords

glutathionenano-TiO2caffeic acidmodified carbon paste electrodeelectrocatalytic oxidationelectrochemical determination

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Shanghai Key Laboratory of Functional Materials Chemistry，School of Chemistry and Molecular Engineering， East China University of Science and Technology

广西大学化学和化学工程学院

广西工学院生物与化学工程系

化学生物传感与计量学国家重点实验室

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