Effect of Nanostructured Carbon Electrode Surfaces on the Percentage of Adsorbed Redox Enzyme Molecules in Direct Electron Transfer Contact

2010 ◽  
Keyword(s):  
Electron Transfer ◽  
Direct Electron Transfer ◽  
Carbon Electrode ◽  
Nanostructured Carbon ◽  
Redox Enzyme ◽  
Electrode Surfaces ◽  
Enzyme Molecules

Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes

2016 ◽  
Vol 109 ◽  
pp. 101-107 ◽  
Author(s):  
Catherine Adam ◽  
Pablo Scodeller ◽  
Matteo Grattieri ◽  
Matías Villalba ◽  
Ernesto J. Calvo
Keyword(s):  
Electron Transfer ◽  
Direct Electron Transfer ◽  
Nanostructured Carbon

scholarly journals Impact of Surface Modification with Gold Nanoparticles on the Bioelectrocatalytic Parameters of Immobilized Bilirubin Oxidase

Acta Naturae ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 102-106 ◽  
Author(s):  
D. V. Pankratov ◽  
Y. S. Zeifman ◽  
А. V. Dudareva ◽  
G. K. Pankratova ◽  
M. E. Khlupova ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electron Transfer ◽  
Transfer Rate ◽  
Direct Electron Transfer ◽  
Electron Transfer Rate ◽  
Bilirubin Oxidase ◽  
Heterogeneous Electron Transfer ◽  
Enzyme Molecules ◽  
Different Diameters ◽  
The Impact

We unveil experimental evidence that put into question the widely held notion concerning the impact of nanoparticles on the bioelectrocatalytic parameters of enzymatic electrodes. Comparative studies of the bioelectrocatalytic properties of fungal bilirubin oxidase from Myrothecium verrucaria adsorbed on gold electrodes, modified with gold nanoparticles of different diameters, clearly indicate that neither the direct electron transfer rate (standard heterogeneous electron transfer rate constants were calculated to be 319 s -1) nor the biocatalytic activity of the adsorbed enzyme (bioelectrocatalytic constants were calculated to be 3411 s -1) depends on the size of the nanoparticles, which had diameters close to or larger than those of the enzyme molecules.

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