Preparation of diagnostic test strips containing tetrazolium salt indicators
First Claim
1. In the method of applying an indicator/reagent system to a matrix carrier, said indicator comprising a tetrazolium salt which, in the presence of the reagent system and a predetermined analyte will undergo a redox reaction resulting in its reduction to a colored formazan, the improvement which comprises:
- a) contacting the matrix with a solution comprising the tetrazolium salt in an organic solvent and drying the matrix to thereby provide a matrix having the tetrazolium salt uniformly dispersed therein; and
b) contacting the matrix having the tetrazolium salt uniformly dispersed therein with an aqueous solution of the reagent system which solution contains an alkylsulfonate of 5-7 straight chain carbon atoms and drying the matrix to thereby deposit the reagent system onto the matrix without eluting a significant amount of the tetrazolium salt therefrom and provide a matrix having the tetrazolium salt and reagent system uniformly dispersed therein.
1 Assignment
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Accused Products
Abstract
Disclosed is an improved procedure for the manufacture of a diagnostic test device comprising a matrix having uniformly dispersed a tetrazolium salt and a reagent system designed to convert the tetrazolium to its colored formazan upon contacting the matrix with a fluid containing an analyte whose presence and/or concentration is being sought. The procedure involves applying the tetrazolium salt to the matrix from its solution in an organic solvent and, after drying, applying the reagent system to the matrix from its aqueous solution to which has been added hexanesulfonate as wetting agent.
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Citations
17 Claims
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1. In the method of applying an indicator/reagent system to a matrix carrier, said indicator comprising a tetrazolium salt which, in the presence of the reagent system and a predetermined analyte will undergo a redox reaction resulting in its reduction to a colored formazan, the improvement which comprises:
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a) contacting the matrix with a solution comprising the tetrazolium salt in an organic solvent and drying the matrix to thereby provide a matrix having the tetrazolium salt uniformly dispersed therein; and b) contacting the matrix having the tetrazolium salt uniformly dispersed therein with an aqueous solution of the reagent system which solution contains an alkylsulfonate of 5-7 straight chain carbon atoms and drying the matrix to thereby deposit the reagent system onto the matrix without eluting a significant amount of the tetrazolium salt therefrom and provide a matrix having the tetrazolium salt and reagent system uniformly dispersed therein. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of applying an indicator/reagent system to a matrix carrier of a porous zwitterionic charged nylon fabric, said indicator comprising a tetrazolium salt capable of undergoing a redox reaction resulting in its reduction to a colored formazan in the presence of the reagent system and a predetermined analyte which method comprises:
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a) contacting the matrix with a solution comprising the tetrazolium salt in an organic solvent and drying the matrix to thereby provide a matrix having the tetrazolium salt dispersed therein; and b) contacting the matrix having the tetrazolium salt dispersed therein with an aqueous solution of the reagent system comprising hexokinase, adenosine triphosphate, glucose-6-phosphate dehydrogenase, diaphorase and nicotinamideadenine dinucloetide which solution contains an alkylsulfonate of 5-7 straight chain carbon atoms and drying the matrix to thereby deposit the reagent system onto the matrix while reducing the amount of tetrazolium salt which is eluted from the matrix from the aqueous solution. - View Dependent Claims (9, 10)
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11. A diagnostic test device prepared by:
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a) contacting a matrix carrier with a solution comprising a tetrazolium salt which, in the presence of a reagent system and a predetermined analyte will undergo a redox reaction resulting in its reduction to a colored formazan in an organic solvent and drying the matrix to thereby provide a matrix having the tetrazolium salt uniformly dispersed therein; and b) contacting the matrix having the tetrazolium salt uniformly dispersed therein with an aqueous solution of the reagent system which solution contains an alkylsulfonate of 5-7 straight chain carbon atoms and drying the matrix to thereby deposit the reagent system onto the matrix to provide a matrix having the tetrazolium salt and reagent system uniformly dispersed therein. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification