聚L-酪氨酸/半胱氨酸/纳米金修饰Pt电极固定血红蛋白测定H_2O_2  

A method to construct a third-generation H_2O_2 biosensor:Hemoglobin immobilized on a gold colloid/cysteine/poly(L-tyrosine)-modified Pt disk electrode

作　　者：杨淦[1] 袁若[1] 柴雅琴[1] 陈时洪[1] 李文娟[1] 

机构地区：[1]西南大学化学化工学院,重庆400715

出　　处：《分析试验室》2008年第6期9-12,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(29705001);教育部优秀青年教师资助计划基金(教人司2002-40);重庆市自然科学基金(CSTC-2004BB4149;2005BB4100);西南大学高新技术培育基金(XSGX02)项目资助

摘　　要：制备了聚L-酪氨酸／半胱氨酸／纳米金／血红蛋白修饰Pt电极，并用循环伏安法和交流阻抗法对制备过程进行了表征。还用循环伏安法和计时电流法研究了修饰电极与H2O2的相互作用。结果表明，该电极对H2O2有明显的催化作用，电流与H2O2浓度在3．5×10^-7～2．0×10^-3mol／L范围内呈线性关系，检出限为1．0×10^-7mol／L。A poly （L-tyrosine）/cysteine/gold colloid/Hemoglobin modified electrode has been prepared. The electrochemical characteristics of the biosensor were studied by cyclic vohammetry and chronoamperometry. The modification process was characterized by electrochemical impedance spectroscopy （E IS） and cyclic vohammetry （CV）. The linear range for the determination of H2O2 is 3.5 × 10^-7 2.0 × 10^-3 mol/L with a detection limit of 1.0 × 10^-7 mol/L. The sensor exhibited high sensitivity, selectivity and stability. The method is applied to the determination of H2 O2 with satisfactory results.

关 键 词：过氧化氢传感器 血红蛋白 聚L-酪氨酸 半胱氨酸 纳米金 

分 类 号：O657.1[理学—分析化学]