Abstract
Direct electron transfer between laccase and a glassy carbon electrode modified with carbon nanotubes having a uniform inner tube diameter was observed by cyclic voltammetry in 0.10 M phosphate buffer. The formal potential of +530 mV ( vs. SCE) was very close to redox potential of T1 copper in laccase. No direct electron transfer between laccase and a glassy carbon electrode modified with carbon nanotubes having a tapered inner tube diameter was determined under the same condition. The possible application of the laccase-catalyzed O 2 reduction at these electrodes was successfully illustrated by constructing an ascorbate/O 2 biofuel cell.
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