儿茶素在铁氰化镍/单壁碳纳米管修饰玻碳电极上的电化学行为及测定  

Electrochemical Behavior and Determination of Catechin on Nickel-Hexacyanoferrate/Single-Walled Carbon Nanotubes Modified Glass Carbon Electrode

作　　者：李梅[1] 杜芳艳[1] 刘慧瑾[1] 高立国[1] 吴礼彬 LI Mei;DU Fang-yan;LIU Hui-jin;GAO Li-guo;WU Li-bin(College of Chemistry and Chemical Engineering,Yulin University,Yulin 719000)

机构地区：[1]榆林学院化学与化工学院

出　　处：《分析科学学报》2019年第5期602-606,共5页Journal of Analytical Science

基　　金：陕西省榆林市科技局项目(No.2016CXY-09-01);榆林学院2014年资助项目(14yk24)

摘　　要：制备了铁氰化镍/单壁碳纳米管修饰玻碳电极(NiHCF/SWCNTs/GCE),并对其进行了表征。采用循环伏安法、方波伏安法研究了儿茶素在该修饰电极上的电化学行为,结果表明该修饰电极对儿茶素具有良好的电催化活性。在优化的条件下,用方波伏安法对儿茶素进行测定,其浓度在2.0×10-6~1.0×10-8 mol/L的范围内与氧化峰电流Ipa呈良好的线性关系(r=0.9990),检出限(S/N=3)为5.0×10-9 mol/L。该方法用于测定菊花茶和海红果中儿茶素的含量,回收率分别在97.70%~105.2%和97.99%~104.0%之间,相对标准偏差分别为0.75%和1.63%。The electrochemical behavior of catechin was investigated by cyclic voltammetry and scanning electron microscopy(SEM) on the nickel hexacyanoferrate and single-walled carbon nanotube modified glassy carbon electrode(NiHCF/SWCNTs/GCE),which was fabricated by cyclic voltammetry and surface coating method.The results indicateded that the electrochemical properties of the electrode were greatly improved by utilizing the nickel-hexacyanoferrate and single-walled carbon nanotubes to modify electrode surface. Meanwhile,the modified electrode exhibited a high electrocatalytic activity for the oxidation of catechin.The oxidation peak current had linear relationships with concentration of catechin over the range of 2.0×10-6-1.0×10-8 mol/L(r=0.9990),and the detection limit(S/N=3)being 5.0×10-9 mol/L.The recoveries of catechin in chrysanthemum tea and malus micromalus were 97.70%-105.2% and 97.99%-104.0%, and the relative standard deviations were 0.75% and 1.63% respectively. The preparation of the NiHCF/SWCNTs/GCE composite electrode is easy,the electrode has high stability and renewable surface.

关 键 词：儿茶素 铁氰化镍 修饰玻碳电极 伏安法 

分 类 号：O657.1[理学—分析化学]