多壁碳纳米管修饰玻碳电极伏安法测定香草醛
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摘要
制备了羧基化多壁碳纳米管修饰玻碳电极(c-MWCNTs/GCE),采用循环伏安法在0.5 mol/L HCl中研究了食品添加剂香草醛的电化学行为。结果显示,该修饰电极对香草醛的电化学氧化具有良好的电催化作用,与裸玻碳电极相比电流响应显著增强。香草醛在该修饰电极上的氧化为不可逆的扩散控制过程。在最佳条件下,采用二阶导数线性扫描伏安法进行测定,香草醛的氧化峰电流与其浓度在0.1～6.0μmol/L和6.0～100μmol/L范围内呈良好的线性关系,检出限(S/N=3)为0.02μmol/L。该修饰电极具有良好的重现性(RSD=4.6%)和稳定性。方法应用于食品中香草醛的测定,回收率为96.3%～104%。
A carboxylated multi-walled carbon nanotubes modified glassy carbon electrode(c-MWCNTs/GCE) was fabricated,and the electrochemical behavior of vanillin was studied in 0.5 mol/L HCl using cyclic voltammetry.Results revealed that the modified electrode showed an better electrocatalytic activity toward the oxidation of vanillin by a significant enhancement in the current response compared with that of the bare glassy carbon electrode.The oxidation of vanillin at this electrode was irreversible and diffusion-controlled.Under the optimum conditions,by second-order derivative linear scan voltammetry,the anodic peak current showed a linear relation versus vanillin concentration in the ranges of 0.1-6.0 μmol/L and 6.0-100 μmol/L with a detection limit(S/N=3)of 0.02 μmol/L.Moreover,the modified electrode demonstrated a good reproducibility(RSD=4.6%) and a long-term stability.This method was applied in the determination of vanillin in food samples with recoveries of 96.3%-104%.
A carboxylated multi-walled carbon nanotubes modified glassy carbon electrode(c-MWCNTs/GCE) was fabricated,and the electrochemical behavior of vanillin was studied in 0.5 mol/L HCl using cyclic voltammetry.Results revealed that the modified electrode showed an better electrocatalytic activity toward the oxidation of vanillin by a significant enhancement in the current response compared with that of the bare glassy carbon electrode.The oxidation of vanillin at this electrode was irreversible and diffusion-controlled.Under the optimum conditions,by second-order derivative linear scan voltammetry,the anodic peak current showed a linear relation versus vanillin concentration in the ranges of 0.1-6.0 μmol/L and 6.0-100 μmol/L with a detection limit(S/N=3)of 0.02 μmol/L.Moreover,the modified electrode demonstrated a good reproducibility(RSD=4.6%) and a long-term stability.This method was applied in the determination of vanillin in food samples with recoveries of 96.3%-104%.
引文
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[4] Waliszewski K N,Pardio V T,Ovando S L.Food Chem.,2006,101:1059-1062.
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[6] Ohashi M,Omae H,Hashida M,Sowa Y,Imai S.J.Chromatogr.A,2007,1138(1/2):262-267.
[7] Longares-Patrón A,Caňizares-Macías M P.Talanta,2006,69(4):882-887.
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[9] Hardcastle J L,Paterson C J,Compton R G.Electroanalysis,2001,13(11):899-905.
[10] Alpar N,Yardrm Y,?entürk Z.Sens.Actuators B,2018,257:398-408.
[11] Shang L,Zhao F Q,Zeng B Z.Food Chem.,2014,151:53-57.
[12] Zheng D Y,Hu C G,Gan T,Dang X P,Hu S S.Sen.Actuators B,2010,148:247-252.
[13] Peng J Y,Hou C T,Hu X Y.Int.J.Electrochem.Sci.,2012,7:1724-1733.
[14] Cheraghi S,Taher M A,Karimi-Maleh H.J.Food Compos.Anal.,2017,62:254-259.
[15] Deng P H,Xu Z F,Zeng R Y,Ding C X.Food Chem.,2015,180:156-163.
[16] Zhang Y H,Xu H,Liu G.J.Instrum.Anal.(张亚会,徐慧,刘刚.分析测试学报),2017,36(10):1208-1213.
[17] Na B S,Zhu Y C,Wang J,Xin S G,Zhang H B.J.Instrum.Anal.(那宝双,朱永春,王佳,辛士刚,张洪波.分析测试学报),2017,36(10):1178-1184.
[18] Shahrokhian S,Hafezi-Kahnamouei M.J.Electroanal.Chem.,2018,825:30-39.
[19] Cosio M S,Pellicanò A,Brunetti B, Fuenmayor C A.Sens.Actuators B,2017,246:673-679.
[20] Afkhami A,Bahiraei A,Madrakian T.Mater.Sci.Eng.C,2016,59:168-176.
[21] Sipa K,Brycht M,Leniart A,Urbaniak P,Nosal-Wiercińska A,Pa?ecz B,Skrzypek S.Talanta,2018:176:625-634.
[22] Laviron E.J.Electroanal.Chem.Interf.Electrochem.,1974,52:355-393.
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