嵌入式碳纳米管石墨电极测定灯盏花素的研究  

Determinate of breviscapine at inlaid carbon nanotubes modified graphite electrode

作　　者：李乔丽[1] 杨敏[1] 高云涛[1] 放茂良[1] 刘琼[1] 李东东[1] 

机构地区：[1]云南民族大学化学与生物技术学院国家民族事务委员会-教育部共建民族药资源化学重点实验室,云南昆明650031

出　　处：《化学研究与应用》2011年第6期742-745,共4页Chemical Research and Application

摘　　要：制备嵌入式多壁碳纳米管修饰石墨电极,利用循环伏安法（CV）研究灯盏花素在嵌入式多壁碳纳米管修饰石墨电极（ESCFE）上的电化学氧化行为,结果表明,灯盏花素在修饰电极上出现一对明显的准可逆氧化还原峰,峰电位分别为Epa=0.17 V和Epc=0.05 V（△E=0.12 V）,峰电流分别为ipa=42.79μA,ipc=40.15μA（ipa/ipc=1.06）。用差分脉冲伏安法（DPV）进行定量分析,在4.0×10-7~1.8×10-5g/L范围内,其浓度与氧化峰电流呈线性关系：ipa=2.4097c×10-6-0.2845（r=0.9994）,检出限为2.4×10-7g/L（3S）,测定灯盏花片中灯盏花素含量,结果也较满意,实验也表明,ESCFE修饰电极精密度和重复性优于碳纳米管修饰玻碳电极（MWNT/GCE）,其峰电流值比MWNT/GCE提高了15倍。The electrochemical behavior of breviscapine was investigated at prepared inlaid multi-wall carbon nanotubes modified graphite electrode by cyclic voltammetry（CV）.A couple of sensitive and quasi-reversible redox peaks of breviscapine was obtained at the modified electrode with 0.17 V of Epa and 0.05 V of Epc（△E=0.12 V）.The ipa and ipc were 42.79 μA and 40.15 μA（ipa /ipc=1.06）,respectively.Differential pulse voltammetry（DPV）was used to determinate the content of breviscapine.The oxidization peak was linearly related to the concentration of breviscapine in the range of 4.0×10-7 ~ 2.6×10-6 g/L,the detection limit was 2.4×10-7 g/L.This method was applied in the determination of breviscapine with satisfactory results.The currents of peaks on the modified ESCFE with good precision and repeatability are improved 15 times than MWNT/GCE.

关 键 词：嵌入式修饰电极 多壁碳纳米管 灯盏花素 循环伏安法 微分脉冲伏安法 

分 类 号：O657.1[理学—分析化学]