Enzyme detection technique
First Claim
1. A diagnostic test kit for detecting the presence or absence of an enzyme within a test sample, the test kit comprising:
- a substrate that is capable of being cleaved in the presence of the enzyme to release a nucleophilic aromatic compound; and
a lateral flow device that comprises;
a chromatographic medium defining a discrete detection zone within which is contained a first reagent, wherein the nucleophilic aromatic compound is capable of flowing through the chromatographic medium and reacting with the first reagent within the detection zone to form a second reagent, the second reagent exhibiting a color that is different than the color of the first reagent; and
an absorbent material positioned adjacent to the chromatographic medium and located downstream from the detection zone, wherein the absorbent material receives the test sample after flowing through the chromatographic medium.
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Abstract
A diagnostic test kit for detecting the presence or absence of an enzyme (e.g., leukocyte esterase) within a test sample is provided. The test kit comprises a substrate that is capable of being cleaved in the presence of the enzyme to release a nucleophilic aromatic compound. The kit also comprises a lateral flow device that comprises a chromatographic medium. The chromatographic medium defines a detection zone within which is contained a first reagent (e.g., diazonium ion) that is capable of reacting with the nucleophilic aromatic compound to form a second reagent (e.g., aromatic azo compound). The second reagent exhibits a color that is different than the color of the first reagent. The lateral flow device also includes an absorbent material located adjacent to the chromatographic medium, the absorbent material receiving the test sample after flowing through the chromatographic medium.
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Citations
38 Claims
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1. A diagnostic test kit for detecting the presence or absence of an enzyme within a test sample, the test kit comprising:
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a substrate that is capable of being cleaved in the presence of the enzyme to release a nucleophilic aromatic compound; and a lateral flow device that comprises; a chromatographic medium defining a discrete detection zone within which is contained a first reagent, wherein the nucleophilic aromatic compound is capable of flowing through the chromatographic medium and reacting with the first reagent within the detection zone to form a second reagent, the second reagent exhibiting a color that is different than the color of the first reagent; and an absorbent material positioned adjacent to the chromatographic medium and located downstream from the detection zone, wherein the absorbent material receives the test sample after flowing through the chromatographic medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 31, 33, 34, 35)
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21. A diagnostic test kit for detecting the presence or absence of leukocyte esterase within urine, the test kit comprising:
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an aromatic ester substrate that is capable of being hydrolyzed in the presence of leukocyte esterase to release a nucleophilic aromatic compound; and a lateral flow device that comprises; a porous membrane defining a discrete detection zone within which is contained a diazonium ion, wherein the nucleophilic aromatic compound is capable of flowing through the chromatographic medium and reacting with the diazonium ion within the detection zone to form an aromatic azo compound, the aromatic azo compound exhibiting a color that is different than the color of the diazonium ion; and an absorbent material positioned adjacent to the porous membrane and located downstream from the detection zone, wherein the absorbent material receives the urine after flowing through the porous membrane. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 36, 37, 38)
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Specification