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血红蛋白在氧化铥修饰玻碳电极表面的直接电化学行为

DIRECT ELECTROCHEMICAL BEHAVIORS OF HEMOGLOBIN IMMOBILIZED ON GC ELECTRODE MODIFIED BY THULIUM OXIDE
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摘要 采用水热合成法制备了纳米氧化铥(Tm2O3)材料并将其应用于酶电极的制作中,采用循环伏安法研究了血红蛋白(Hb)在Tm2O3修饰的玻碳电极上的电化学行为。实验结果表明,固定在Tm2O3材料上的Hb,不仅能有效地与电极表面进行直接电子转移,而且能够保持其生物活性。制得的Nafion/Tm2O3/Hb/GC修饰电极的电子传递速率Ks为0.98s-1,对H2O2的检测限为1.813μmol·L-1,重现性和稳定性较好。Tm2O3在实验中体现出一定的生物相容性,起到了促进Hb直接电子传递的作用。 irect electrochemical behaviors of hemoglobin(Hb) immobilized on GC electrode modified by thulium oxide(Tm2O3) are investigated carefully by use of cyclic voltammetry.Hb immobilized on Nafion Tm2O3 film can not only achieve effective direct electron transfer,but also have its bioactivity well retained.The apparent heterogeneous electron transfer rate constant(Ks) of the Nafion/Tm2O3 /Hb/GC electrode is 0.98 s-1.The electrocatalytic response shows a linear dependence on the H2O2 concentration,ranging from 2.45μmol·L-1 to 24.5 μmol·L-1,with the H2O2 detection limit being 1.813 μmol·L-1.High stability and fine reproducibility are exhibited.In the experiment,Tm2O3 displays excellent biocompatibility and provides a friendly microenvironment for the electron transfer between Hb and GC.
出处 《内蒙古工业大学学报(自然科学版)》 2010年第4期254-259,共6页 Journal of Inner Mongolia University of Technology:Natural Science Edition
基金 国家自然科学基金(No.50667001) 教育部留学回国人员科研启动金 "西部之光"人才培养计划 内蒙古工业大学校基金重点项目(No.ZD200611)资助
关键词 血红蛋白 氧化铥 过氧化氢 直接电化学 hemoglobin, thulium oxide, hydrogen peroxide, direct electrochemistry.
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