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《Acta Chimica Sinica》 2012-05
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Preparation of the Ordered Mesoporous Carbon/Fe_3O_4 and Its Application for the Direct Electrochemistry of Hemoglobin

Zheng,Jing,a,b Zhao,Jiachanga Gong,Chena Liu,Pinga Chen,Yua Huang,Huana He,Pingangb Fang,Yuzhib(aCollege of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620)(bDepartment of Chemistry,East China Normal University,Shanghai 200062)  
The novel magnetic composites of ordered mesoporous carbon/Fe3O4 were prepared with a micro-wetness impregnation method.The composites were characterized by transmission electron microscope and X-ray diffraction.Hemoglobin was immobilized onto the surface of the composites,and was shown to keep its biological activity well.The electrochemical behavior of Hb was studied,and a pair of well-defined,quasi-reversible cyclic voltammetric redox peaks was obtained,which was characteristics of Hb Fe(Ⅲ)/Fe(Ⅱ) redox couples.The formal potential(E0'),the electron transfer number(n),and transfer coefficient(α) were calculated to be-0.306 V,1.226 and 0.51,respectively.The average apparent heterogeneous electron transfer rate constant(KS) obtained for Hb was 0.0144 s-1.Linear sweep voltammetric measurement of Hb indicated that the peak currents of Hb were linear to its concentration ranging from 3.00×10-6to 1.50×10-4mol/L with the detection limits of 0.270×10-6mol/L.
【Fund】: 国家自然科学基金(No.20675031);; 上海市教委(No.09YZ374)资助项目~~
【CateGory Index】: O629.73
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