Dry chemistry glucose sensor
First Claim
1. A self contained sensor for the potentiometric assay of glucose comprising:
- a sensing electrode strip, the sensing electrode strip comprising;
an electrically insulating base strip and an electrically conductive layer in contact with the base strip and a redox membrane which coats the electrically conductive layer, the redox membrane comprising;
a polymer matrix, the polymer matrix containing;
a plasticizer, anda complex of 7,7,8,8-tetracyanoquinodimethane and tetrathiafulvalene characterized by a burgundy red coloration, and a reference electrode strip, the reference electrode strip comprising;
an electrically insulating base strip coated with an electrically conductive formulation containing silver and silver chloride, with the reference electrode and the sensing electrode having a gap between them, and a water absorbent carrier strip, the water absorbent carrier strip impregnated with a mixture comprising;
glucose oxidase,peroxidase,an oxidizable dye,at least one surfactant andat least one thickening agent, with the carrier strip bridging the gap between the sensing electrode strip and the reference electrode strip and in simultaneous contact with the redox membrane of the sensing electrode and the coating of electrically conductive formulation containing silver and silver chloride of the reference electrode.
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Abstract
A self contained glucose sensor is provided that generally comprises a strip type glucose sensing electrode having an active surface comprising an organic conducting redox salt dispersed in a polymeric membrane, with the membrane coating a conductive strip and a strip type Ag/AgCl reference electrode having its active surface separated from physical contact with the strip type glucose sensor and a carrier strip of water absorbent paper or film containing an enzyme system and an oxidizable dye. The water absorbent carrier strip is in simultaneous contact with both the active surface of the strip type glucose electrode and the active surface of the strip type reference electrode. When an aqueous solution containing glucose is brought in contact with the carrier strip containing the enzyme system an electrical potential, proportional to the concentration of glucose in the solution, is created which can be detected by an electrometer or other suitable device.
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Citations
13 Claims
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1. A self contained sensor for the potentiometric assay of glucose comprising:
a sensing electrode strip, the sensing electrode strip comprising; an electrically insulating base strip and an electrically conductive layer in contact with the base strip and a redox membrane which coats the electrically conductive layer, the redox membrane comprising; a polymer matrix, the polymer matrix containing; a plasticizer, and a complex of 7,7,8,8-tetracyanoquinodimethane and tetrathiafulvalene characterized by a burgundy red coloration, and a reference electrode strip, the reference electrode strip comprising; an electrically insulating base strip coated with an electrically conductive formulation containing silver and silver chloride, with the reference electrode and the sensing electrode having a gap between them, and a water absorbent carrier strip, the water absorbent carrier strip impregnated with a mixture comprising; glucose oxidase, peroxidase, an oxidizable dye, at least one surfactant and at least one thickening agent, with the carrier strip bridging the gap between the sensing electrode strip and the reference electrode strip and in simultaneous contact with the redox membrane of the sensing electrode and the coating of electrically conductive formulation containing silver and silver chloride of the reference electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A potentiometric sensing electrode comprising;
an electrically insulating base strip and an electrically conductive layer in contact with the base strip and a redox membrane which coats the electrically conductive layer, the redox membrane comprising; a polymer matrix, the polymer matrix containing; a plasticizer, and a complex of 7,7,8,8-tetracyanoquinodimethane and tetrathiafulvalene characterized by a burgundy red coloration. - View Dependent Claims (12, 13)
Specification