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中文摘要：
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%。
英文摘要：
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%.
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