Nafion-多壁碳纳米管复合膜修饰玻碳电极测定岩白菜素的研究  

Determination of Bergenin Using Nafion-Multiwalled Carbon Nanotubes Composite Film Modified Glassy Carbon Electrode

作　　者：周群[1] 段德良[1] 王光灿[2] 王庆忠[1] 殷志禹[1] 曹秋娥[1] 丁中涛[1] 

机构地区：[1]云南大学化学科学与工程学院,云南昆明650091 [2]云南大学现代分析测试中心,云南昆明650091

出　　处：《分析测试学报》2009年第11期1240-1244,共5页Journal of Instrumental Analysis

基　　金：云南大学博士科研启动基金资助项目;云南省教育厅科学研究基金重点项目(08Z0010);云南大学理工科校基金重点项目(2008YB039)

摘　　要：研制了以Nation分散多壁碳纳米管的化学修饰电极，研究了岩白菜素在该修饰电极上的电化学行为和电化学动力学性质。发现修饰电极对岩白菜素有显著的电催化作用，岩白菜素的氧化过程是单电子单质子过程，岩白菜素在该修饰电极上的扩散系数、速率常数分别为6．02×10^-6cm^2·S^-1、5．54×10^-3mol·L^-1·S^-1。通过优化各项参数，建立了一种直接测定岩白菜素的电分析方法。该方法的线性范围为1．44×10^-7～1．92×10^-6mol·L^-1和4．18×10^-5-1．06×10^-4mol·L^-1，检出限为1．02×10^-7mol·L^-1，同支电极测定10次的相对标准偏差为4．6％，可用于岩白菜素样品的含量测定。A chemically modified electrode of Nation -muhiwalled carbon nanotubes coated glassy carbon electrode（ Nafion- MWCNTs/GCE） was prepared. The electrochemical behaviors of bergenin and its electroanalytical method were studied. The modified electrode exhibited a remarkable catalytic and enhanced effects on the current response of bergenin. The property of kinetics were also studied. The results indicated that one - electron and one - proton transfer were involved in the electrode reaction process. Diffusion coefficient （D） and rate constant （k） were 6.02×10^-6cm^2·S^-1 and 5.54×10^-3mol·L^-1·S^-1, respectively. The experimental conditions were optimized. Under the optimal conditions, the linear calibration range for bergenin were 1.44×10^-7～1.92×10^-6mol·L^-1 and 4.18×10^-5-1.06×10^-4mol·L^-1 with a detection limit of 1.02×10^-7mol·L^-1. The RSD （n = 10） for determination of bergenin sample were 4. 6% . This method was applied in the determination of bergenin in the real sample with satisfactory results.

关 键 词：多壁碳纳米管 NAFION 化学修饰电极 岩白菜素 电化学行为 

分 类 号：O657.1[理学—分析化学]