Journal
BIOELECTROCHEMISTRY
Volume 133, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2020.107457
Keywords
FAD-dependent glucose dehydrogenase; Bioelectrocatalysis; Direct electron transfer; Platinum nanocluster; Porous gold electrode
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The direct electron transfer (DET)-type bioelectrocatalysis of flavin adenine dinucleotide (FAD)dependent glucose dehydrogenase (GDH) from Aspergillus terreus (AtGDH) was carried out using porous gold (Au) electrodes and enzymatically implanted platinum nanoclusters (PtNCs). The porous Au electrodes were prepared by anodization of planar Au electrodes in a phosphate buffer containing glucose as a reductant. Moreover, PtNCs were generated into AtGDH by an enzymatic reduction of hexachloroplatinate (IV) ion. The modification was confirmed by native polyacrylamide gel electrophoresis and sodium dodecyl sulfate polyacrylamide gel electrophoresis analyses. The AtGDH-adsorbed porous Au electrode showed a DET-type bioelectrocatalytic wave both in the presence and absence of PtNCs; however, the current density with PtNCs (similar to 1 mA cm(-2) at 0 V vs. Ag vertical bar AgCl vertical bar sat. KCl) was considerably higher than that without PtNCs. The kinetic and thermodynamic analysis of the steady-state catalytic wave indicated that inner PtNCs shortened the distance between the catalytic center of AtGDH (=FAD) and the conductive material, and improved the heterogeneous electron transfer kinetics between them. (C) 2020 The Authors. Published by Elsevier B.V.
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