羟甲香豆素在刚果红功能化水溶性多壁碳纳米管膜电极上的电化学行为  

Electrochemical Behavior of Hymecromone and Its Voltammetric Determination at Congo Red-functionalized Water-soluble Multi-walled Carbon Nanotube Film Electrode

作　　者：杨春海[1] 张升晖[1] 余爱农[1] 胡成国[2] 胡胜水[2] 

机构地区：[1]湖北省生物资源保护与利用重点实验室,湖北民族学院,恩施445000 [2]武汉大学化学学院,武汉

出　　处：《应用化学》2008年第4期449-454,共6页Chinese Journal of Applied Chemistry

基　　金：湖北省自然科学基金(2004ABA235);湖北省教育厅重点项目(D200629004)资助项目

摘　　要：基于刚果红对多壁碳纳米管的非共价修饰，在玻碳电极表面制备了一种水溶性多壁碳纳米管（MWNTs—CR）膜。用线性扫描法、连续循环伏安法和计时库仑法研究了羟甲香豆素（HMC）在该电极上的电化学氧化过程．与裸玻碳电极相比．HMC的氧化峰电流在MWNTs—CR膜上得到了增强，并在痕量阳离子表面活性剂十六烷基三甲基溴化铵存在下得到最大增敏。HMC的浓度在8．0×10^-8～4．0×10^-6mol／L范围内，其氧化峰电流与浓度呈现出良好的线性关系。在开路条件下富集300s后，HMC的检出限为2．0×10^-8mol／L。方法用于复方胆通片中HMC含量的测定，结果令人满意：Fabrication of water-soluble multi-wall carbon nanotubes （MWNTs-CR） film modified glassy carbon electrode（MWNTs-CR/GCE） was carried out via the non-covalent modification of congo red for MWNTs. The electrochemical behavior of hymecromone at MWNTs-CR/GCE was investigated by linear sweep voltammetry （LSV）, successive cyclic voltammetry and chronocoulometry. Compared with that at bare GCE, the electrochemical response of hymecromone at MWNTs-CR/GCE was greatly enhanced, which was further amplified by the addition of trace cetyltrimethylammonium bromide （ CTAB ） in solution. In a range of 8. 0 × 10 ^-8- 4. 0 × 10^-6 mol/L, the oxidation peak current was linear with hymecromone concentration and a low detection limit of 2. 0 × 10 ^-8 mol/L was obtained for 300 s accumulation at open circuit. This method was applied to determine the content of hymecromone in the compound hymecromone tablet sample, the results were satisfactory.

关 键 词：水溶性多壁碳纳米管膜 羟甲香豆素 化学修饰电极 表面活性剂 

分 类 号：O657.1[理学—分析化学]