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Cholate Adsorption Behavior at Carbon Electrode Interface and Its Promotional Effect in Laccase Direct Bioelectrocatalysis

Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan
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Colloids Interfaces 2018, 2(3), 33; https://doi.org/10.3390/colloids2030033
Received: 11 July 2018 / Revised: 4 August 2018 / Accepted: 12 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue Biosurfactants: Trends and Applications)
Fast electron transfer between laccase (Lac) and single-walled carbon nanotubes (SWCNTs) can be achieved at a cholate-modified SWCNT interface. Furthermore, the catalytic reduction of O2 starts at a high potential, close to the equilibrium redox potential of the O2/H2O couple. A sodium cholate (SC)-modified electrode interface provides suitable conditions for Lac direct bioelectrocatalysis. In the present study, the SC promotional effect in Lac direct bioelectrocatalysis was investigated using various types of electrode materials. The fully hydrophilic surface of indium tin oxide and an Au electrode surface did not show a SC promotional effect, because SC did not bind to these surfaces. A carbon surface with a large number of defects was unsuitable for SC binding because of hydrophilic functional groups at the defect sites. Carbon surfaces with few defects, for example, basal-plane highly oriented pyrolytic graphite (HOPG), gave a SC promotional effect. View Full-Text
Keywords: cholate; laccase; adsorption; bioelectrocatalysis; electron transfer; carbon electrode cholate; laccase; adsorption; bioelectrocatalysis; electron transfer; carbon electrode
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Tominaga, M.; Tsutsui, M.; Takatori, T. Cholate Adsorption Behavior at Carbon Electrode Interface and Its Promotional Effect in Laccase Direct Bioelectrocatalysis. Colloids Interfaces 2018, 2, 33.

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