Test Sensors and Methods of Using The Same
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Accused Products
Abstract
A reagent composition containing GDH-PQQ as an enzyme-co-factor and screen-printed on working and counter electrodes of electrochemical biosensors, maintains activity of the enzyme reagents by proper selection of components. A preferred composition includes hydrophilic polymers, amorphous untreated silica, buffers, surfactants, and a mediator.
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Citations
47 Claims
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1-17. -17. (canceled)
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18. An electrochemical biosensor comprising:
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(a) a non porous substrate; (b) at least two electrodes disposed on said substrate; and (c) a reagent composition deposited on said at least two electrodes, said composition comprising; (1) about 1-8 units of glucose dehydrogenase (GDH) and co-factor pyrrolo-quinoline quinone (PQQ), for each milligram of the total weight of said composition; (2) a hydrophilic polymer selected from the group consisting of cellulose derivatives, natural gums and gels, and water soluble synthetic polymers; (3) a thickening agent selected from the group consisting of amorphous untreated silica powder, talc, mica, diatomaceous earth, and natural and modified clays; (4) a buffer sufficient to maintain pH in the range of from about 4.5 to about 6.5; (5) a surfactant; and (6) a mediator. - View Dependent Claims (19, 20, 21, 24, 26, 33, 34)
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22-23. -23. (canceled)
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25. (canceled)
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27-32. -32. (canceled)
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35. A biosensor comprising:
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a substrate; at least two electrodes disposed on said substrate; a reagent composition deposited on the at least two electrodes, said composition comprising; (a) glucose dehydrogenase (GDH) and co-factor pyrrolo-quinoline quinone (PQQ); (b) 2 to about 10 wt% of a hydrophilic polymer selected from cellulose derivatives, based on the total weight of the composition; (c) a buffer sufficient to maintain pH in the range of from about 4.5 to about 6.5; (d) a surfactant; and (e) a mediator. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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44. A biosensor comprising:
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a substrate; at least two electrodes disposed on said substrate; a reagent composition deposited on the at least two electrodes, said composition comprising; (a) an enzyme; (b) 2 to about 10 wt % of a hydrophilic polymer selected from cellulose derivatives, based on the total weight of the composition; (c) a buffer sufficient to maintain pH in the range of from about 4.5 to about 6.5; (e) a surfactant; and (f) a mediator. - View Dependent Claims (45, 46, 47)
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Specification