e-journal

Magnetic Field Effects on Bioelectrocatalytic Reactions of Surface-Confined Enzyme Systems: Enhanced Performance of Biofuel Cells

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Abstract:
The effect of a constant magnetic field on bioelectrocatalytic transformations of three different
enzyme assemblies linked to electrodes is examined and correlated with a theoretical magnetohydrodynamic
model. The systems consist of surface-reconstituted glucose oxidase (GOx), an integrated lactate
dehydrogenase/nicotinamide/pyrroloquinoline quinone assembly (LDH/NAD+-PQQ), and a cytochrome
c/cytochrome oxidase system (Cyt c/COx) linked to the electrodes. Pronounced effects of a constant
magnetic field applied parallel to the electrode surface are observed for the bioelectrocatalyzed oxidation
of glucose and lactate by the GOx-electrode and LDH/NAD+-PQQ-electrode, respectively. The enhancement
of the bioelectrocatalytic processes correlates nicely with the magnetohydrodynamic model, and the limiting
current densities (iL) relate to B1/3 (B ) magnetic flux density) and to C*4/3 (C* ) bulk concentration of the substrate). A small magnetic field effect is observed for the Cyt c/COx-electrode, and its origin is still questionable. The effect of the constant magnetic field on the performance of biofuel cells with different configurations is examined. For the biofuel cell consisting of LDH/NAD+-PQQ anode and Cyt c/COx cathode, a 3-fold increase in the power output was observed at an applied magnetic field of B ) 0.92 T and external load of 1.2 k¿.

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Informasi Detail

Judul Seri

J. AM. CHEM. SOC.

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2005

Deskripsi Fisik

J. AM. CHEM. SOC. 2005, 127, 3979-3988

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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