Stable diagnostic reagent
First Claim
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1. A process for stabilizing a diagnostic reagent composition comprising glucose oxidase, the process comprising the step ofadding succinic acid or a salt thereof to the composition in an amount effective to stabilize the composition.
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Abstract
The inclusion of succinic acid or a salt thereof to stabilize compositions that include glucose oxidase and/or ferricyanide. Typically, the succinic acid or succinic acid salt is included in a diagnostic reagent utilized in test strips or test solutions useful for the analysis of glucose from a fluid sample.
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Citations
20 Claims
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1. A process for stabilizing a diagnostic reagent composition comprising glucose oxidase, the process comprising the step of
adding succinic acid or a salt thereof to the composition in an amount effective to stabilize the composition.
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2. A process for stabilizing a diagnostic reagent composition comprising ferricyanide, the process comprising the step of
adding succinic acid or a salt thereof to the composition in an amount effective to stabilize the composition.
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3. A process for stabilizing a diagnostic reagent composition comprising glucose oxidase and ferricyanide, the process comprising the step of
adding succinic acid or a salt thereof to the composition in an amount effective to stabilize the composition.
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10. A diagnostic reagent composition, comprising
glucose oxidase and ferricyanide in an aqueous medium, or in a dried matrix, the ferricyanide being present in an amount effective to function as a redox mediator in the catalytic oxidation of glucose; - and
succinic acid or a salt thereof in a concentration of about 18.5 millimolar to about 55 millimolar to stabilize the composition. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for forming a stabilized rehydratable diagnostic reagent composition comprising glucose oxidase and ferricyanide, the method comprising the steps of
forming an aqueous solution comprising glucose oxidase, ferricyanide in an amount sufficient to function as a redox mediator in the catalytic oxidation of glucose by the glucose oxidase, a surfactant, and succinic acid or a salt thereof in an amount sufficient to stabilize the composition, and drying the solution to remove at least about 90% by weight water to form a stabilized dry reagent composition.
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