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

机译：碳电极界面上胆酸盐的吸附行为及其在漆酶直接生物电催化中的促进作用

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摘要

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.
机译：漆酶（Lac）和单壁碳纳米管（SWCNT）之间的快速电子转移可以在胆酸盐修饰的SWCNT界面处实现。此外，O2的催化还原从高电势开始，接近O2 / H2O对的平衡氧化还原电势。胆酸钠（SC）修饰的电极界面为Lac直接生物电催化提供了合适的条件。在本研究中，使用各种类型的电极材料研究了SC在Lac直接生物电催化中的促进作用。氧化铟锡的完全亲水性表面和Au电极表面没有显示出SC促进作用，因为SC没有结合到这些表面上。具有大量缺陷的碳表面由于缺陷位点处的亲水性官能团而不适合于SC结合。几乎没有缺陷的碳表面（例如，基面高度取向的热解石墨（HOPG））具有SC促进作用。

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