Direct electrochemistry and electrochemical catalysis of myoglobin-TiO2 coated multiwalled carbon nanotubes modified electrode

Bioelectrochemistry
Lei ZhangJun-Jie Zhu

Abstract

TiO(2) nanoparticles were homogeneously coated on multiwalled carbon nanotubes (MWCNTs) by hydrothermal deposition, and this nanocomposite might be a promising material for myoglobin (Mb) immobilization in view of its high biocompatibility and large surface. The glassy carbon (GC) electrode modified with Mb-TiO(2)/MWCNTs films exhibited a pair of well-defined, stable and nearly reversible cycle voltammetric peaks. The formal potential of Mb in TiO(2)/MWCNTs film was linearly varied in the range of pH 3-10 with a slope of 48.65 mV/pH, indicating that the electron transfer was accompanied by single proton transportation. The electron transfer between Mb and electrode surface, k(s) of 3.08 s(-1), was greatly facilitated in the TiO(2)/MWCNTs film. The electrocatalytic reductions of hydrogen peroxide were also studied, and the apparent Michaelis-Menten constant is calculated to be 83.10 microM, which shows a large catalytic activity of Mb in the TiO(2)/MWCNTs film to H(2)O(2). The modified GC electrode shows good analytical performance for amperometric determination of hydrogen peroxide. The resultant Mb-TiO(2)/MWCNTs modified glassy carbon electrode exhibited fast amperometric response to hydrogen peroxide reduction, long term life...Continue Reading

References

Jan 29, 1988·Biochimica Et Biophysica Acta·W K Surewicz, H H Mantsch
Mar 5, 2002·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Chunhai FanDexu Zhu
Aug 17, 2004·Biosensors & Bioelectronics·Hui-Hong LiuDai-Wen Pang
Dec 15, 2005·Analytical Chemistry·Aihua LiuHaoshen Zhou
Apr 20, 2006·Biosensors & Bioelectronics·Qing LuShengshui Hu
Jul 19, 2006·Analytical and Bioanalytical Chemistry·Hui-Hong LiuGuo-Lin Zou

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Citations

Dec 1, 2010·Colloids and Surfaces. B, Biointerfaces·S Ashok KumarChun-Ting Yeh
Apr 5, 2011·Analytica Chimica Acta·Karen ScidaCarlos D García
May 7, 2009·Nanotechnology·Ling MengChenxin Cai
Nov 17, 2010·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Lifang QiaoJianbin Zheng
Jan 1, 2011·Analytical Methods : Advancing Methods and Applications·Shengwei TanLi Liu

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