Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 11, Pages 1691-1694Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.08.049
Keywords
Bilirubin oxidase; Carbon nanotube; Direct electron transfer; Enzyme gold electrode
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Funding
- Ministerium fur Wissenschaft, Forschung
- Kultur Brandenburg, Germany [116 101 12]
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Electrochemical properties of bilirubin oxidase (BOD) and multi-walled carbon nanotubes (MWCNT) modified gold electrodes were characterised by linear sweep voltammetry. For enhancement of the direct electron transfer of BOD an interlayer of different aromatic compounds was introduced between the adsorbed or covalently bound enzyme and the MWCNTs. By usage of pyrroloquinoline quinone (PQQ) an increased catalytic oxygen current was observed. The reduction process starts at a potential of +500 mV vs. Ag/AgCl, 1 M KCl. The peak current density in unstirred solution could be determined with about 500 mu A/cm(2). A reduction of the diffusion layer thickness by stirring enhances the current density up to 1600 mu A/cm(2) (at +250 mV). (C) 2008 Elsevier B.V. All rights reserved.
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