Biosensor

• US 20040005721A1
• Filed: 01/15/2003
• Published: 01/08/2004
• Est. Priority Date: 05/29/2001
• Status: Active Grant

• Current Assignee: PHC Holdings Corporation
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanike, Yuko, Ikeda, Shin, Yoshioka, Toshihiko
• Granted Patent: US 7,022,218 B2
• Time in Patent Office: Days
• US Class Current: 436/518
• CPC Class Codes: C12Q 1/001 Enzyme electrodes
• CPC Class Codes: C12Q 1/006 for glucose
• CPC Class Codes: C12Q 1/26 involving oxidoreductase
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52

Abstract

The present invention provides a highly sensitive biosensor capable of yielding good response even when the amount of a sample is extremely small. The biosensor of the present invention includes: a first insulating base plate which has a working electrode comprising a plurality of branches and a first counter electrode comprising a plurality of branches, the branches of the working electrode and the first counter electrode being arranged alternately; a second insulating base plate which has a second counter electrode and which is disposed at a position opposite to the first insulating base plate; a reagent system comprising an oxidoreductase; and a sample supply pathway formed between the first and second insulating base plates, wherein the branches of the working electrode and the first counter electrode that are arranged alternately, the second counter electrode, and the reagent system are exposed in the sample supply pathway.

Claims

1. A biosensor including:

a first insulating base plate which has a working electrode comprising a plurality of branches and a first counter electrode comprising a plurality of branches, said branches of the working electrode and the first counter electrode being arranged alternately;

a second insulating base plate which has a second counter electrode and which is disposed at a position opposite to the first insulating base plate;

a reagent system comprising an oxidoreductase; and

a sample supply pathway formed between the first and second insulating base plates, wherein said branches of the working electrode and the first counter electrode that are arranged alternately, the second counter electrode, and the reagent system are exposed in said sample supply pathway.

2. The biosensor in accordance with claim 1, wherein the second counter electrode is disposed only at a position opposite to the working electrode in said sample supply pathway.

3. A biosensor including:

a first insulating base plate which has a first working electrode comprising a plurality of branches and a first counter electrode comprising a plurality of branches, said branches of the first working electrode and the first counter electrode being arranged alternately;

a second insulating base plate which has a second working electrode comprising a plurality of branches and a second counter electrode comprising a plurality of branches, said branches of the second working electrode and the second counter electrode being arranged alternately;

a reagent system comprising an oxidoreductase; and

a sample supply pathway formed between the first and second insulating base plates, wherein said branches of the first working electrode and the first counter electrode that are arranged alternately, said branches of the second working electrode and the second counter electrode that are arranged alternately, and the reagent system are exposed in said sample supply pathway.

4. The biosensor in accordance with claim 3, wherein the second counter electrode is disposed at a position opposite to the first working electrode, and the second working electrode is disposed at a position opposite to the first counter electrode.