Coupled enzyme systems for determination of dissolved substances
First Claim
1. A method for determining the amount of a substrate in solution, said substrate being capable of direct or indirect conversion catalyzed by a dehydrogenase, comprising the steps of:
- (a) admixing a liquid sample containing said substrate with an enzymatic assay system comprising at least a first and second enzyme, to produce an assay solution;
wherein each of said enzymes is independently capable of catalyzing the direct or indirect conversion of said substrate, said conversion in each case resulting in production of a product capable of separate direct or indirect analytical measurement or visualization; and
wherein said first enzyme is a non-pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a first detectable product over a first detection range, and said second enzyme is a pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a second detectable product over a second, different detection range; and
(b) directly or indirectly measuring or visualizing said detectable products in said assay solution.
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Abstract
A test system having an extended range of measurement and a corresponding procedure for the determination of substances in liquids contains several enzymes or enzyme systems together which, independently of one another, react directly or indirectly with the substance to be determined. On adding the test system to the sample solution, various final products are produced which can be distinguished analytically and evaluated by measurement techniques or visually. For example, glucose can be determined over a wide range of concentrations using a combination of an NAD-dependent dehydrogenase and a non-NAD-dependent dehydrogenase.
74 Citations
19 Claims
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1. A method for determining the amount of a substrate in solution, said substrate being capable of direct or indirect conversion catalyzed by a dehydrogenase, comprising the steps of:
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(a) admixing a liquid sample containing said substrate with an enzymatic assay system comprising at least a first and second enzyme, to produce an assay solution;
wherein each of said enzymes is independently capable of catalyzing the direct or indirect conversion of said substrate, said conversion in each case resulting in production of a product capable of separate direct or indirect analytical measurement or visualization; and
wherein said first enzyme is a non-pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a first detectable product over a first detection range, and said second enzyme is a pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a second detectable product over a second, different detection range; and(b) directly or indirectly measuring or visualizing said detectable products in said assay solution. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An enzymatic assay reagent system for determining the amount of a substrate in solution, said substrate being capable of direct or indirect conversion catalyzed by a dehydrogenase, comprising an admixture of at least two enzymes, each of which is independently capable of catalyzing the direct or indirect conversion of said substrate, said conversion in each case resulting in production of a product capable of separate direct or indirect analytical measurement or visualization;
- wherein said first enzyme is a non-pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a first detectable product over a first detection range, and said second enzyme is a pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a second detectable product over a second, different detection range.
- View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. In a kit for use in an enzymatic assay to determine the amount of a substrate in solution, said substrate being capable of direct or indirect conversion catalyzed by a dehydrogenase, said kit comprising an assay reagent system comprising at least one enzyme for converting said substrate, together with coenzymes and auxiliaries necessary for carrying out an enzymatic assay using said assay reagent system, and at least one container for preparing an assay solution,
the improvement wherein said assay reagent system comprises an admixture of at least two enzymes, each of which is independently capable of catalyzing the direct or indirect conversion of said substrate, said conversion in each case resulting in production of a product capable of separate direct or indirect analytical measurement or visualization; - wherein said first enzyme is a non-pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a first detectable product over a first detection range, and said second enzyme is a pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a second detectable product over a second, different detection range.
- View Dependent Claims (18)
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19. In a test strip for use in an enzymatic assay to determine the amount of a substrate in solution, said substrate being capable of direct or indirect conversion catalyzed by a dehydrogenase, said test strip comprising an absorbent material impregnated with a solution of an enzymatic assay reagent system for said substrate, together with coenzymes and auxiliaries necessary for carrying out said assay and visualizing the result,
the improvement wherein said assay reagent system comprises an admixture of at least two enzymes, each of which is independently capable of catalyzing the direct or indirect conversion of said substrate, said conversion in each case resulting in production of a product capable of separate direct or indirect analytical measurement or visualization; - wherein said first enzyme is a non-pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a first detectable product over a first detection range, and second enzyme is a pyridine-linked dehydrogenase which catalyzes conversion and resultant production of a second detectable product over a second, different detection range.
Specification