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Direct Electrochemistry and Electrocatalysis of Myoglobin Immobilized on Gold Nanoparticles/Carbon Nanotubes Nanohybrid Film

✍ Scribed by Wei Cao; Cuimei Wei; Jingbo Hu; Qilong Li

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
372 KB
Volume
20
Category
Article
ISSN
1040-0397

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✦ Synopsis

Abstract

A novel nanohybrid material, constructed by gold nanoparticles (GNPs) and multiwalled carbon nanotubes (MWNTs), was designed for immobilization and biosensing of myoglobin (Mb). Morphology of the nanohybrid film was characterized by SEM. UV‐vis spectroscopy demonstrated that Mb on the composite film could retain its native structure. Direct electrochemistry of Mb immobilized on the GNPs/MWNTs film was investigated. The immobilized Mb showed a couple of quasireversible and well‐defined cyclic voltammetry peaks with a formal potential of about βˆ’0.35β€…V (vs. Ag/AgCl) in pHβ€…6.0 phosphate buffer solution (PBS) solution. Furthermore, the modified electrode also displayed good sensitivity, wide linear range and long‐term stability to the detection of hydrogen peroxide. The experiment results demonstrated that the hybrid matrix provided a biocompatible microenvironment for protein and supplied a necessary pathway for its direct electron transfer.

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