Composite of enzyme and carbon structure complex, method for producing the same and use thereof
First Claim
1. A method for producing a composite of enzyme and carbon structure, comprising:
- (1) dispersing elongated carbon structures in an aqueous enzyme-solution comprising an enzyme so that the enzyme molecules adsorb on a surface of the carbon structures, wherein the surface of the carbon structures is not modified to form functional groups capable of forming covalent bonds with the enzyme molecules;
(2) adding a precipitant to the enzyme solution to cause the enzyme molecules to precipitate and to deposit on the carbon structure; and
(3) adding a cross-linker to cross-link the precipitated enzyme molecules, wherein the cross-linked enzyme molecules surround the carbon structures, and wherein there is no covalent bonding between the carbon structures and the enzyme molecules.
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Abstract
Disclosed is a composite of enzyme and carbon structure. In the composite of enzyme and carbon structure, a significantly large amount of an enzymeis immobilized on the surface of carbon structures without the formation of chemical bonds (particularly, covalent bonds) between the enzyme molecules and the carbon structures. Since the surface of the carbon structures does not need to be modified to form chemical bonds, the electrical conductivity of the composite of enzyme and carbon structure is not reduced and the stability of the composite is maintained high even after the passage of a long time in various environments. Therefore, the use of the composite of enzyme and carbon structure enables the fabrication of various devices, such as biosensors and biofuel cells, with markedly improved performance as compared to the use of conventional enzyme/carbon structure composites.
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Citations
14 Claims
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1. A method for producing a composite of enzyme and carbon structure, comprising:
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(1) dispersing elongated carbon structures in an aqueous enzyme-solution comprising an enzyme so that the enzyme molecules adsorb on a surface of the carbon structures, wherein the surface of the carbon structures is not modified to form functional groups capable of forming covalent bonds with the enzyme molecules; (2) adding a precipitant to the enzyme solution to cause the enzyme molecules to precipitate and to deposit on the carbon structure; and (3) adding a cross-linker to cross-link the precipitated enzyme molecules, wherein the cross-linked enzyme molecules surround the carbon structures, and wherein there is no covalent bonding between the carbon structures and the enzyme molecules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A composite of enzyme and carbon structure comprising:
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elongated carbon structures, wherein a surface of the carbon structures is not modified to introduce functional groups capable of forming covalent bonds with enzyme molecules; and one or more shells comprising crosslinked enzyme molecules surrounding the carbon structures, wherein there is no covalent bonding between the enzyme molecules and the carbon structures. - View Dependent Claims (11, 12, 13, 14)
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Specification