生物合成纳米金与MWCNTs/L-Cys复合修饰玻碳电极测定左旋多巴  

Determination of Levodopa Using Biosynthesed Gold Nanoparticles/Multiwalled Carbon Nanotubes/L-Cysteine Composite Film Modified Glassy Carbon Electrode

作　　者：岳伟超[1] 蔡卓[1] 蒋翠文[1] 叶丹妮[1] 

机构地区：[1]广西大学化学化工学院,南宁530004

出　　处：《高等学校化学学报》2014年第2期250-256,共7页Chemical Journal of Chinese Universities

基　　金：广西自然科学基金(批准号:2010GXNSFA013001)资助~~

摘　　要：利用荷叶萃取液生物合成纳米金,并与多壁碳纳米管/L-半胱氨酸复合成修饰电极材料,研究了左旋多巴在该修饰电极上的电化学行为.在0.2 mol/L乙酸-乙酸钠体系(pH=2.6)中,氧化峰电流与左旋多巴浓度在0.6~40μmol/L及60~120μmol/L范围内呈良好的线性关系,检出限达5.2×10-8mol/L.实验结果表明,生物合成纳米金复合多壁碳纳米管/L-半胱氨酸修饰电极具有良好的稳定性和高灵敏度,对实际样品测定的回收率在91.2%~102.5%之间.Gold nanoparticles were bio-synthesized by the lotus leaf extract. The Au multiwalled carbon nanotubes（ MWCNTs）/L-cysteine（L-Cys） composite material was prepared. The electrochemical behavior of levo- dopa at the modified electrode was studied. In 0. 2 mob/L HAc-NaAc（ pH=2. 6） buffer, levodopa concentra- tion was linear with oxidation peak current in the range of 0.6----40 and 60--120 p^mol/L, and the detection limit was 5.2x 10-s mob/L（ S/N = 3 ）. The results show that the Au/MWCNTs/L-Cys modified electrode has good stability and high sensitivity. It has a satisfactory result to determine the effective component of real sam- ple with the recovery of standard addition was between 91.2%--102. 5%.

关 键 词：生物合成 荷叶 多壁碳纳米管 左旋多巴 

分 类 号：O657.1[理学—分析化学] O646[理学—化学]