Direct electrochemical behavior of hemoglobin at surface of Au@Fe3O4 magnetic nanoparticles

被引:43
作者
Yu, Chun-Mei [1 ,2 ]
Guo, Jian-Wei [1 ]
Gu, Hai-Ying [1 ]
机构
[1] Nantong Univ, Sch Publ Hlth, Nantong 226007, Peoples R China
[2] Soochow Univ, Coll Chem & Chem Engn & Mat Sci, Suzhou 215123, Peoples R China
关键词
Au@Fe3O4 nanoparticles; Hemoglobin; Hydrogen peroxide; Direct electrochemistry; DIRECT ELECTRON-TRANSFER; HYDROGEN-PEROXIDE; ELECTROCATALYSIS; BIOSENSOR; FILM; IMMOBILIZATION; CHITOSAN;
D O I
10.1007/s00604-009-0192-9
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Nanoparticles (NPs) consisting of an Fe3O4 core and a thin gold shell (referred to as Au@Fe3O4 NPs) were self-assembled on the surface of a glassy carbon electrode modified with ethylenediamine. Following adsorption of hemoglobin, its interaction with the NPs was studied by UV-Vis spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. Stable and well-defined redox peaks were observed at about -350 mV and -130 mV in pH 6.0 buffer. The modified electrode was used as a mediator-free sensor for hydrogen peroxide (H2O2), with a linear range from 3.4 A mu M to 4.0 mM of H2O2, and with a 0.67 A mu M detection limit (at an S/N of 3). The apparent Michaelis-Menten constant is 2.3 mM.
引用
收藏
页码:215 / 220
页数:6
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