花旗松素在碳纳米管-离子液体修饰碳糊电极上的电催化氧化及其测定  

Electrocatalytic oxidation and determination of taxifolion at multi-wall carbon nanotube-ionic liquid modified carbon paste electrode

作　　者：闫莉莉[1] 高云涛[2] 李晓芬[2] 

机构地区：[1]铜仁学院材料与化学工程学院,贵州铜仁554300 [2]云南民族大学化学与生物技术学院,云南昆明650500

出　　处：《化学研究与应用》2015年第7期1003-1008,共6页Chemical Research and Application

基　　金：梵净山特色动植物资源重点实验室基金项目(黔教KY[2011]232号-)资助;梵净山主要经济植物种质基地建设及其开发利用研究基金项目(黔教合重大专项字[2012]018号)资助

摘　　要：制备了碳纳米管（MWCNTs）和疏水性离子液体N-丁基吡啶六氟磷酸盐（[Bu Py]PF6）复合修饰碳糊电极（MWCNTs-[Bu Py]PF6/CPE）,利用循环伏安法研究了花旗松素在MWCNTs-[Bu Py]PF6/CPE上的电化学氧化行为。结果表明,花旗松素在修饰电极上出现一对灵敏、准可逆的氧化还原峰,氧化峰电位Epa=0.60 V,还原峰电位Epc=0.24 V,△Ep=0.46 V,氧化峰电流ipa=3.96μA,还原峰电流ipc=5.03μA,ipa/ipc=0.79,表明MWCNTs-[Bu Py]PF6/CPE对花旗松素具有良好的电催化氧化作用。用差分脉冲伏安法（DPV）测得花旗松素的氧化峰电流ipa与浓度c在1.2×10^-5-4.0×10^-2g·L^-1范围内呈良好线性,检出限为2.2×10^-6g·L^-1。该法用于水红花子中花旗松素含量的测定,RSD为1.1%-1.5%,加标回收率为97.3%-101.3%。A new MWCNTs-[Bu Py]PF6/ CPE modified carbon paste electrode was prepared by multi-wall carbon nanotube and hydrophobic ionic liquid N-butyl pyridine hexafluorophosphate; the electrochemical oxidation behavior of taxifolion at MWCNTs-[Bu Py]PF6/ CPE was investigated. The result showed that a couple of sensitive and quasi-reversible redox peaks of taxifolion was obtained at the modified electrode with 0. 60 V of Epaand 0. 24 V of Epc（ △Ep= 0. 46 V）. The ipaand ipcwere 3. 96 μA and 5. 03μA（ ipa/ ipc= 0. 79）,respectively; indicating that MWCNTs-[Bu Py]PF6/ CPE could catalyze the electrochemical oxidation of taxifolion very well. The changes of the oxidation peak currents with taxifolion were determinated by differential pulse voltammetry（ DPV）. The calibration curve was linear in the concentration range of 1. 2×10^-5- 4. 0×10^-2g·L^-1. The detection limit was 2. 2×10^-6g·L^-1. The method was applied in the determination of taxifolion in fructus polygoni orientali,obtaining the relative standard deviation was between 1. 1%and 1. 5%,and the spiked recoveries were in the range of 97. 3%-101. 3%.

关 键 词：花旗松素 碳纳米管 离子液体 电催化氧化 

分 类 号：O657.1[理学—分析化学]