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Direct electron transfer of hemoglobin on dihexadecyl hydrogen phosphate/single-wall carbon nanotubes film modified Au electrode and its interaction with taxol

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Abstract

Direct electrochemistry of hemoglobin (Hb) immobilized on the dihexadecyl hydrogen phosphate (DHP)/single-wall carbon nanotubes (SWNTs) film modified Au electrode is investigated. The immobilized Hb displays a couple of stable and well-defined redox peaks, whose formal potential (E 0) is −0.434 V (SCE) in a phosphate buffer solution of pH 7.0. The formal potential of the heme Fe(III)/Fe(II) couple shifts negatively linearly with increased pH with a slope of −42.3 mV/pH, denoting that one electron transfer accompanies single proton transportation. Both SWNTs and DHP can accelerate the electron transfer between Hb and the electrode. Using DHP/Hb/SWNTs-film-modified Au electrode, the interaction between Hb and taxol is investigated. The voltammetric response of Hb decreases with increasing concentration of taxol. The peak currents decreases proportionally to the taxol concentration at 1.4 × 10−5 to 1.3 × 10−4 M, the linear regression equation being Δi (A) = 2.9603 − 0.4225 ctaxol (M), with a correlation coefficient (r) 0.9985, and the detection limit 6.95 × 10−6 M (signal-to-noise ratio of three).

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Authors and Affiliations

  1. Anhui Normal University, Wuhu, 241000, P.R. China

    Y. Z. Zhang, W. X. Cheng & S. P. Li

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  1. Y. Z. Zhang
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  2. W. X. Cheng
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  3. S. P. Li
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Correspondence to Y. Z. Zhang.

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Published in Russian in Elektrokhimiya, 2007, Vol. 43, No. 7, pp. 801–807.

The text was submitted by the authors in English.

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Zhang, Y.Z., Cheng, W.X. & Li, S.P. Direct electron transfer of hemoglobin on dihexadecyl hydrogen phosphate/single-wall carbon nanotubes film modified Au electrode and its interaction with taxol. Russ J Electrochem 43, 764–769 (2007). https://doi.org/10.1134/S102319350707004X

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  • DOI: https://doi.org/10.1134/S102319350707004X

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