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《Acta Physico-chimica Sinica》 2005-02
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Direct Electrochemistry of Hemoglobin Immobilized on Carbon Paste Electrode Modified by Carbon Nanotubes

LI,Yu-Ping1,2 CAO,Hong-Bin1 ZHANG,Yi1(1Instutite of Process Engineering,Chinese Academy of Sciences,Beijing 100080;2Graduate School of the Chinese Academy of Sciences,Beijing 100039)  
Direct electrochemical behaviors of Hemoglobin(Hb) adsorbed on carbon paste electrode modified by carbon nano-tubes(CNTs) were investigated.Hb-CNT-modified electrode showed a pair of well-defined and nearly reversible cyclic voltammetric peaks for HbhemeFe(Ⅲ)/Fe(Ⅱ) redox couple in phosphate buffered s aline solution(pH=7.0).The formal potential (E01) was-0.160 V (vs SCE),which w as almost independent of the scan rate.The number of electron transferred (n) wa s 1.021,suggesting about an electron transfer between the heme group of Hb and t he electrode.The average apparent heterogeneous electron transfer rate constant (ks) obtained by fitting CV data for Hb on CNT-modified electrode was 0.0816 s-1,greater than the value obtained from the same method for Hb with methylene b lue as mediators.Hb-CNT-modified electrode showed a stable and significant cat alytic activity for the electrochemical reduction of hydrogen peroxide,trichloro acetic acid and nitrobenzene.
【Fund】: 国家高技术研究发展规划(863项目)(2004AA649340);; 国家自然科学基金(30400011)资助项目~~
【CateGory Index】: O629
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