Nanostructured Carbon Electrodes For Oxygen Reduction Catalyzed By Laccase Without any Mediators

Krzysztof Stolarczyk 1Ewa Nazaruk 1Krzysztof Biesiada 3A. Olszyna 3Jerzy Rogalski 2Renata Bilewicz 1

1. Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland
2. Maria Curie Sklodowska University, Department of Biochemistry, Pl. Sklodowskiej 3, Lublin 20-031, Poland
3. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

Laccase is one of the enzymes for which direct electron transfer on macroscopic electrode surface has been demonstrated. However, most approaches to electron conduction from electrode to the enzyme involve mediators, molecular relays which can take electrons from the electrode and deliver them to the redox site of the enzyme. We show the catalytic reduction of oxygen on different carbon materials: boron-doped diamond (BDD), glassy carbon (GC), GC decorated with nanotubes or carbon microparticles in the presence of laccase either remaining in the solution or adsorbed on the electrode. Three different matrices: lecithin, hydrophobin and lipid liquid crystalline cubic phases were used for the immobilization of laccase on the electrode. Significant decrease of overpotential and increase of biocatalytic reduction current is observed without the need of employing additional mediators. These properties of the system studied are very interesting from the viewpoint of applications in electrochemical sensors and microbiofuel cells.

 

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Presentation: Short communication at SMCBS'2007 International Workshop, by Krzysztof Stolarczyk
See On-line Journal of SMCBS'2007 International Workshop

Submitted: 2007-07-19 13:24
Revised:   2009-06-07 00:44