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

Content Provider	Springer Nature Link
Author	Zhang, Y. Z. Cheng, W. X. Li, S. P.
Copyright Year	2007
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 c$_{taxol}$ (M), with a correlation coefficient (r) 0.9985, and the detection limit 6.95 × 10$^{−6}$ M (signal-to-noise ratio of three).
Starting Page	764
Ending Page	769
Page Count	6
File Format	PDF
ISSN	10231935
Journal	Russian Journal of Electrochemistry
Volume Number	43
Issue Number	7
e-ISSN	16083342
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	hemoglobin single-wall carbon nanotube dihexadecyl hydrogen phosphate taxol Electrochemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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