Biosensor and method for quantitating biochemical substrate using the same
First Claim
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1. A biosensor comprising:
- an insulating substrate;
an electrode system formed on the insulating substrate which comprises a working electrode and a counter electrode; and
a solid phase reaction layer formed on the insulating substrate which contains a solid phase oxidoreductase and a solid phase ferrocene electrolyte as an electron acceptor, the solid phase reaction layer being formed over at least a portion of the working electrode or the counter electrode, wherein the ferrocene electrolyte consists of a ferricinium ion and a mono-anion, and wherein the ferricinium ion is provided in the biosensor together with the oxidoreductase upon dissolution of the reaction layer.
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Abstract
A biosensor includes: an insulating substrate; an electrode system formed on the insulating substrate which has a working electrode and a counter electrode; and a reaction layer formed on the insulating substrate which contains an oxidoreductase and an electron acceptor. The electron acceptor is ferricinium ion derived from ferrocene electrolyte.
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Citations
14 Claims
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1. A biosensor comprising:
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an insulating substrate;
an electrode system formed on the insulating substrate which comprises a working electrode and a counter electrode; and
a solid phase reaction layer formed on the insulating substrate which contains a solid phase oxidoreductase and a solid phase ferrocene electrolyte as an electron acceptor, the solid phase reaction layer being formed over at least a portion of the working electrode or the counter electrode, wherein the ferrocene electrolyte consists of a ferricinium ion and a mono-anion, and wherein the ferricinium ion is provided in the biosensor together with the oxidoreductase upon dissolution of the reaction layer. - View Dependent Claims (2, 3, 4)
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5. A method for quantitating the concentration of a biochemical substrate in a sample liquid by using a biosensor comprising an insulating substrate, an electrode system formed on the insulating substrate which has a working electrode and a counter electrode and a solid phase reaction layer provided on the insulating substrate which contains a solid phase oxidoreductase and a solid phase ferrocene electrolyte as an electron acceptor, the solid phase reaction layer being formed over at least a portion of the working electrode or the counter electrode, comprising the steps of:
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adding the sample liquid to the reaction layer; and
detecting a response current value by applying a voltage between the working electrode and counter electrode, wherein the ferrocene electrolyte consists of a ferricinium ion and a mono-anion, and wherein the ferricinium ion is provided in the biosensor together with the oxidoreductase upon dissolution of the reaction layer. - View Dependent Claims (6, 7, 8, 9)
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10. A biosensor comprising:
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an insulating substrate;
an electrode system formed on the insulating substrate which comprises a working electrode and a counter electrode; and
a solid phase reaction layer formed on the insulating substrate which contains a solid phase oxidoreductase and a solid phase ferrocene electrolyte as an electron acceptor, the solid phase reaction layer being formed over at least a portion of the working electrode or the counter electrode, wherein the ferrocene electrolyte consists of a ferricinium ion and a mono-anion, an enzymatic reaction occurs spontaneously between the oxidoreductase substrate, the oxidoreductase and the ferricinium ion of the ferrocene electrolyte, regardless of a potential of the electrode system, and wherein the ferricinium ion is provided in the biosensor together with the oxidoreductase upon dissolution of the reaction layer. - View Dependent Claims (11, 12, 13, 14)
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Specification