Test strips for detecting the presence of a reduced cofactor in a sample and method for using the same
First Claim
1. A composition of matter comprising:
- a non-bibulous positively charged substrate; and
at least one water soluble tetrazolium salt on at least one surface of said positively charged substrate.
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Accused Products
Abstract
Test strips and methods for their use in the detection of an analyte in a sample are provided. The subject test strips are characterized by at least including a water soluble tetrazolium salt on a surface of a positively charged substrate. In many embodiments, the water soluble tetrazolium salt is present as part of an analyte oxidizing signal producing system, which system includes one or more of the following additional components: an analyte oxidizing enzyme, e.g., an analyte dehydrogenase or an analyte oxidase; an electron transfer agent; and an enzyme cofactor. Also provided are systems and kits incorporating the subject test strips. The subject test strips, systems and kits find use in the measurement of a wide variety of analytes in a sample, such as a physiological sample, e.g., blood or a fraction thereof.
181 Citations
25 Claims
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1. A composition of matter comprising:
a non-bibulous positively charged substrate; and
at least one water soluble tetrazolium salt on at least one surface of said positively charged substrate.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A reagent test strip comprising:
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a positively charged substrate; and
an analyte oxidizing signal producing system present on said positively charged substrate, wherein said analyte oxidizing signal producing system includes a water soluble tetrazolium salt. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An analyte detection or measurement system comprising:
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(a) a reagent test strip comprising;
(i) a positively charged substrate; and
(ii) an analyte oxidizing signal producing system present on said substrate, wherein said signal producing system includes a water soluble tetrazolium salt capable of accepting a hydride to produce a water soluble formazan; and
(b) an automated instrument.
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17. A method for detecting the presence or determining the concentration of an analyte in a sample, said method comprising:
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(a) applying said physiological sample to a reagent test strip comprising;
(i) a positively charged substrate; and
(ii) an analyte oxidizing signal producing system present on said substrate, wherein said signal producing system includes a water soluble tetrazolium salt capable of producing a water soluble formazan product, whereby a non-washable spot comprising said formazan product is produced on said substrate;
(b) detecting said non-washable spot; and
(c) relating said detected non-washable spot to the presence or concentration of said analyte in said physiological sample. - View Dependent Claims (18, 19, 20, 21)
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22. A kit for use in determining the concentration of an analyte in a physiological sample, said kit comprising:
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(a) a reagent test strip comprising;
(i) a positively charged substrate; and
(ii) an analyte oxidizing signal producing system present on said substrate, wherein said signal producing system includes a water soluble tetrazolium salt capable of producing a water soluble formazan product; and
(b) at least one of;
(i) a means for obtaining said physiological sample and (ii) an analyte standard. - View Dependent Claims (23, 24, 25)
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Specification