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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Direct Electron Transfer of Glucose Oxidase and Carbon Nanotubes Entrapped with Biocompatible Organic Materials

Cited 5 times inthomson ciCited 3 times inthomson ci
Title
Direct Electron Transfer of Glucose Oxidase and Carbon Nanotubes Entrapped with Biocompatible Organic Materials
Author
Kim, Ji HyeonLee, Hye JungJung, HaesookSong, Hyun-KonYoon, Hyon HeeWon, Keehoon
Keywords
Ag/AgCl; Biocompatible polymer; Bioelectronic device; Biofuel cell; Catalytic activity; Cyclic voltammograms; Direct electron transfer; Electron transfer; Enzyme-based biosensors; GC electrode; Glassy carbon electrodes; Organic materials; Phosphate buffer solutions; Redox centers; Redox enzyme; Redox peaks; Redox potentials
Issue Date
201001
Publisher
TAYLOR & FRANCIS LTD
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.519, no.1, pp.82 - 89
Abstract
Efficient electron transfer between redox enzymes and electrodes is essential for enzyme-based biosensors, biofuel cells, and bioelectronic devices. Generally glucose oxidase (GOx) requires mediators for electrical communication with electrodes because the redox center of GOx is deeply buried in the insulating protein shell. In the present work, direct electron transfer (DET) between GOx and electrodes was attempted. GOx and carbon nanotubes (CNTs) were immobilized on a glassy carbon (GC) electrode by using biocompatible polymer, chitosan (CHI). Cyclic voltammograms revealed that the CHI/GOx/CNT-GC electrode showed a pair of well-defined redox peaks in 0.1M phosphate buffer solution (pH 7.0) saturated with argon. Under the same conditions, no redox peak was observed in the absence of CNTs. The formal redox potential was similar to 450mV (vs. Ag/AgCl), which agreed well with that of FAD/FADH(2), the redox center of GOx. This result clearly shows that the DET between the GOx and the electrode was achieved. The use of thin CNTs significantly improved the DET efficiency of the GOx. It was found that the GOx immobilized on the electrode retained catalytic activity for the oxidation of glucose.
URI
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DOI
http://dx.doi.org/10.1080/15421401003604112
ISSN
1542-1406
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