Direct electrochemistry of cytochrome c at a glassy carbon electrode modified with single-wall carbon nanotubes |
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Authors: | Wang Jianxiu Li Meixian Shi Zujin Li Nanqiang Gu Zhennan |
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Affiliation: | College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China. |
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Abstract: | The electrochemistry of horse heart cytochrome c was studied by cyclic voltammetry at a glassy carbon electrode modified with single-wall carbon nanotubes (SWNTs). A pair of well-defined redox waves was obtained in cytochrome c aqueous solution at an activated SWNT film-modified electrode. The optimal conditions for activating the SWNT film-modified electrode has been determined. The electrode reaction of cytochrome c is a diffusion-controlled process. The peak current increases linearly with the concentration of cytochrome c in the range from 3.0 x 10(-5)-7.0 x 10(-4) M. The detection limit is 1.0 x 10(-5) M. The activated SWNT film was characterized by scanning electron microscopy. Furthermore, interaction of cytochrome c with adenine was characterized by electrochemical and spectral methods. |
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