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Electrocatalysis of hemoglobin in ionic liquid BMIMPF6 and CuS nanosphere composite films

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Author(s): Chengxiang Ruan | Jin Lou | Dandan Wang | Canying Zhang | Wei Sun

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 25;
Issue: 3;
Start page: 443;
Date: 2011;
Original page

Keywords: Hemoglobin | Direct electrochemistry | Copper sulfide nanosphere | 1-Butyl-3-methylimidazolium hexafluorophosphate | Hydrogen peroxide

ABSTRACT
Ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) was mixed homogeneously with nanometer-sized semiconductor CuS sphere to form a new nanocomposite material, which was further used for the immobilization of hemoglobin (Hb) on the surface of carbon paste electrode (CPE). Direct electrochemistry of Hb in BMIMPF6-CuS composite film was carefully investigated with a pair of quasi-reversible redox peaks appeared and the formal potential (E0') was got as -135 mV (vs. SCE) in pH 7.0 phosphate buffer solution, which was due to the enhanced direct electron transfer rate of Hb in the biocompatible matrix. The BMIMPF6-CuS-Hb/CPE showed excellent electrocatalytic activity to the reduction of hydrogen peroxide with the kinetic parameters for the electrocatalytic reaction evaluated. The results indicated that the BMIMPF6-CuS nanocomposite could be used for the preparation of electrochemical biosensor.

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