Dipstick immunoassay device
First Claim
1. A dipstick immunoassay device comprising:
- a base member;
a single, combined sample contact zone and test zone, defined on said base member, said test zone including a control indicia portion, a test indicia portion and a non-indicia portion;
a first immobilized immunological component being disposed solely in said control indicia portion, said first immunological component being an anti-immunoglobulin which is capable of binding to an enzyme-labeled antibody, said enzyme-labeled antibody producing a visual color differential between said control indicia portion and said non-indicia portion upon contact with a substrate;
a second immobilized immunological component being disposed solely in said test indicia portion, said second immunological component being capable of specifically binding to a target analyte which is bound to said enzyme-labeled antibody to form a sandwich complex, said enzyme-labeled antibody producing a visually discernable difference between said indicia portions and said non-indicia portion, upon contact with a substrate;
a first polyol distributed throughout said non-indicia portion of said test zone; and
a color differential enhancing component selected from the group consisting of an inhibitor to said enzyme and a competitive secondary substrate for said enzyme, said component distributed throughout said non-indicia portion of said test zone.
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Accused Products
Abstract
The invention pertains to dipstick immunoassay devices. The device comprises a base member and a single, combined sample contact zone and test zone, wherein the test zone incorporates the use of symbols to detect analytes in a sample of biological fluid. A first immunological component, an anti-immunoglobulin capable of binding to an enzyme-labeled antibody, is immobilized in a control indicia portion. A second immunological component, capable of specifically binding to a target analyte which is bound to the enzyme-labeled antibody to form a sandwich complex, is immobilized in a test indicia portion. The enzyme-labeled antibody produces a visual color differential between a control indicia portion and a non-indicia portion in the test zone upon contact with a substrate. The device additionally includes a first polyol and a color differential enhancing component selected from the group consisting of an inhibitor to the enzyme and a competitive secondary substrate for the enzyme distributed throughout the non-indicia portion of the test zone.
126 Citations
26 Claims
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1. A dipstick immunoassay device comprising:
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a base member; a single, combined sample contact zone and test zone, defined on said base member, said test zone including a control indicia portion, a test indicia portion and a non-indicia portion; a first immobilized immunological component being disposed solely in said control indicia portion, said first immunological component being an anti-immunoglobulin which is capable of binding to an enzyme-labeled antibody, said enzyme-labeled antibody producing a visual color differential between said control indicia portion and said non-indicia portion upon contact with a substrate; a second immobilized immunological component being disposed solely in said test indicia portion, said second immunological component being capable of specifically binding to a target analyte which is bound to said enzyme-labeled antibody to form a sandwich complex, said enzyme-labeled antibody producing a visually discernable difference between said indicia portions and said non-indicia portion, upon contact with a substrate; a first polyol distributed throughout said non-indicia portion of said test zone; and a color differential enhancing component selected from the group consisting of an inhibitor to said enzyme and a competitive secondary substrate for said enzyme, said component distributed throughout said non-indicia portion of said test zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A dipstick immunoassay device comprising:
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a base member; a single, combined sample contact zone and test zone, defined on said base member, said test zone including a control indicia portion, a test indicia portion and a non-indicia portion; a first immobilized antibody being disposed solely in said control indicia portion, said first immobilized antibody being an anti-immunoglobulin antibody which is capable of binding to an alkaline phosphatase-labeled antibody, said alkaline phosphatase-labeled antibody producing a visual color differential between said control indicia portion and said non-indicia portion upon contact with a substrate; a second immobilized antibody being disposed solely in said test indicia portion, said second antibody being capable of specifically binding to a target analyte which is bound to said alkaline phosphatase-labeled antibody to form a sandwich complex, said alkaline phosphatase-labeled antibody producing a visually discernable difference between said indicia portions and said non-indicia portion, upon contact with a substrate; a first polyol distributed throughout said non-indicia portion of said test zone; and a color differential enhancing component selected from the group consisting of an inhibitor to said alkaline phosphatase and a competitive secondary substrate for said alkaline phosphatase, said component distributed throughout said non-indicia portion of said test zone. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification