Enzyme electrode and method for producing the same
First Claim
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1. A method for producing an enzyme electrode used to detect glucose, comprising:
- providing a substrate having a carbon surface, wherein the substrate is a pencil lead, and the carbon surface is formed by coating a carbon paste on the surface of the pencil lead;
forming a gold surface on the carbon surface and thus forming an electrode;
modifying the gold surface by L-cysteine to bond covalently the gold particles of the gold surface and the sulphydryl group of L-cysteine, thereby forming a first electrode having a first modified surface;
modifying the first modified surface by N,N′
-dicyclohexylcarbodiimide, the L-cysteine of the first modified surface and the N,N′
-dicyclohexylcarbodiimide being dehydrated to form covalent bonds, thereby forming a second electrode having a second modified surface; and
contacting the second modified surface with the glucose oxidase, an amide bond being formed between the L-cysteine group of the second modified surface and the glucose oxidase, thereby forming a third electrode having a third modified surface.
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Abstract
An enzyme electrode and its producing method are disclosed. The method includes providing a substrate having a carbon surface; forming a gold surface on the carbon surface and forming an electrode; modifying the gold surface by L-cysteine; modifying the gold surface by N,N′-dicyclohexylcarbodiimide; and chemically bonding the modified gold surface with a glucose oxidase.
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14 Claims
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1. A method for producing an enzyme electrode used to detect glucose, comprising:
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providing a substrate having a carbon surface, wherein the substrate is a pencil lead, and the carbon surface is formed by coating a carbon paste on the surface of the pencil lead; forming a gold surface on the carbon surface and thus forming an electrode; modifying the gold surface by L-cysteine to bond covalently the gold particles of the gold surface and the sulphydryl group of L-cysteine, thereby forming a first electrode having a first modified surface; modifying the first modified surface by N,N′
-dicyclohexylcarbodiimide, the L-cysteine of the first modified surface and the N,N′
-dicyclohexylcarbodiimide being dehydrated to form covalent bonds, thereby forming a second electrode having a second modified surface; andcontacting the second modified surface with the glucose oxidase, an amide bond being formed between the L-cysteine group of the second modified surface and the glucose oxidase, thereby forming a third electrode having a third modified surface. - View Dependent Claims (2, 3, 4)
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5. An enzyme electrode used to detect glucose and produced by the method as follows:
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providing a substrate having a carbon surface, wherein the substrate is a pencil lead, and the carbon surface is formed by coating a carbon paste on the surface of the pencil lead; forming a gold surface on the carbon surface and thus forming an electrode; modifying the gold surface by L-cysteine to bond covalently the gold particles of the gold surface and the sulphydryl group of L-cysteine, thereby forming a first electrode having a first modified surface; modifying the first modified surface by N,N′
-dicyclohexylcarbodiimide, the L-cysteine of the first modified surface and the N,N′
-dicyclohexylcarbodiimide being dehydrated to form covalent bonds, thereby forming a second electrode having a second modified surface; andcontacting the second modified surface with the glucose oxidase, an amide bond being formed between the L-cysteine group of the second modified surface and the glucose oxidase, thereby forming the enzyme electrode. - View Dependent Claims (6, 7, 8, 9)
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10. An enzyme electrode used to detect glucose, comprising:
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a substrate structure, said substrate structure comprising a pencil lead, a carbon paste coated on the surface of the pencil lead, and a gold layer covering the carbon paste; a modified structure, said modified structure being chemically bound with the gold layer, the modified structure comprising a L-cysteine group and a glucose oxidase group, an Au—
S covalent bond being formed between the gold layer and the L-cysteine group, and an amide bond being covalently bound between the L-cysteine group and the glucose oxidase group. - View Dependent Claims (11, 12, 13, 14)
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Specification