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Electron mediator, electron mediator immobilized electrode, and biofuel cell using the electrode

Published online: Jul 17, 2009

Geographical region	USA
Subject	Electron mediator
Issue date	Jun 9, 2009
Title	Electron mediator, electron mediator immobilized electrode, and biofuel cell using the electrode
Patent Number	US7544438 B2
Patent Application Number	US20050049313 A1
Assignee	Daiichi Pure Chemicals Co Ltd, Japan
Relevance	An electron mediator for smooth electron transfer between an enzyme and an electrode that are applied in a biofuel cell or biosensor.
Type of claims	Grant
Overview	This patent discloses a biofuel cell or a biosensor having a highly functional mediator containing a VK3 derivative which facilitates smooth electron transfer between an electrode and a biocatalyst. This method involves biocatalyst such as diaphorase and dehydrogenase that are strongly immobilized on the electrode. Advantageously, the electrode provides high fuel utilization rate, hence the electrode is applied to highly efficient, miniature biofuel cell and the electrode is safe and hence can be used for an implanted biological device. The electrode comprises, A) a mediator comprising a quinone molecule derivative (naphthoquinone molecule derivative), B) a crosslinking agent and C) a polymer (polyvinyl imidazole) or a biopolymer (enzyme), wherein the quinone molecule derivative is a quinone molecule modified with a functional group bonded with (i) the polymer or the biopolymer or (ii) the crosslinking agent, the mediator is immobilized through bonding of the modified functional group of the quinone molecule derivative and the mediator mediates electron transfer between an enzyme and an electrode.
Related patent documents	US Patent publications US5264104 - Enzyme electrodes (1993) US5443701 - Electrobiochemical analytical method and electrodes (1995) US5972199 - Electrochemical analyte sensors using thermostable peroxidase (1999) US6461496 - Small volume in vitro analyte sensor with diffusible or non-leachable redox mediator (2002) US6531239 - Biological fuel cell and methods (2003) US20030087144 - Enzymatic fuel cell with fixed dehydrogenase enzyme (2003) Foreign patent publications JP10310799 - Rinsing auxiliary agent composition for plastic tableware (1998) JP2000133297 - Bio metabolism-utilizing power generating method and battery, and electronic mediator immobilizing electrode using them (2000)
Patent Document	Full Patent Document [external link]

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