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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 3
BKCSDE 30(3)
March 20, 2009

Title	Electrochemistry of Hemoglobin in the Chitosan and TiO₂ Nanoparticles Composite Film Modified Carbon Ionic Liquid Electrode and Its Electrocatalysis
Author	Wei Sun*, Xiaoqing Li, Shufeng Liu, Kui Jiao
Keywords	Hemoglobin, TiO₂ nanoparticles, Ionic liquid, Carbon paste electrode, Electrochemistry
Abstract	Direct electron transfer of hemoglobin (Hb) in the chitosan (CTS) and TiO₂ nanoparticles (nano-TiO₂) composite films was achieved by using a room temperature ionic liquid of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF₆) modified carbon paste electrode (CILE) as the basal electrode. UV-Vis and FT-IR spectroscopy indicated that Hb in the film retained the native structure. Electrochemical investigation indicated that a pair of well-defined quasi-reversible redox peaks of Hb heme Fe(III)/Fe(II) was obtained with the formal potential located at -0.340 V (νs. SCE) in pH 7.0 phosphate buffer solution (PBS). The electrochemical parameters such as the electron transfer coefficient (α), the electron transfer number (n) and the standard electron transfer rate constant (ks) were got as 0.422, 0.93 and 0.117 s^-1, respectively. The fabricated CTS/nano-TiO₂/Hb/CILE showed good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) and hydrogen peroxide (H₂O₂), which exhibited a potential application in fabricating a new kind of third generation biosensor.
Page	582 - 588
Full Text	PDF

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