Method for determining an analyte in a liquid sample using a zoned test device and an inhibitor for a label used in said method
First Claim
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1. Method for determining an analyte in a liquid sample, comprising:
- (i) contacting a liquid sample to a zoned device containing first, second, and third zones, wherein said first and second zones are in fluid contact with each other and said second and third zones are in fluid contact with each other, to permit flow of liquid sample from said first zone into said second zone and from said second zone into said third zone, wherein(ii) said first zone contains at least one non-solid phase bound, label carrying receptor which specifically binds to said analyte to form a complex of receptor and analyte in a liquid phase,(iii) said second zone contains a non-solid phase bound inhibitor for the label of said labelled receptor, wherein said inhibitor is not acted upon by said label and directly inhibits said label from forming a detectable signal when said liquid phase containing complexes of receptor and analyte flows from said first zone and into said second zone,(iv) said third zone contains a solid phase bound, unlabelled receptor which specifically binds to complexes of analyte and labelled receptor but not to said inhibitor when liquid containing (a) complexes of analyte and labelled receptor and (b) inhibitor flow therein from said second zone, wherein said contacting is carried out under conditions favoring binding of said complex and said solid phase receptor,(v) removing said inhibitor from said third zone, and(vi) determining a detectable signal produced in said third zone by said label in said complex as a determination of said analyte.
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Abstract
The invention relates to a heterogeneous immunoassay which is carried out using a multizoned test device. In particular, the invention involves the use of an inhibitor of a label which is used in the assay. The label which may be an enzyme, is attached to a receptor such as an antibody. The inhibitor is not acted upon by the label, but must be removed in order for a signal to be produced. Also described are test strips which can be used for the assay.
57 Citations
24 Claims
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1. Method for determining an analyte in a liquid sample, comprising:
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(i) contacting a liquid sample to a zoned device containing first, second, and third zones, wherein said first and second zones are in fluid contact with each other and said second and third zones are in fluid contact with each other, to permit flow of liquid sample from said first zone into said second zone and from said second zone into said third zone, wherein (ii) said first zone contains at least one non-solid phase bound, label carrying receptor which specifically binds to said analyte to form a complex of receptor and analyte in a liquid phase, (iii) said second zone contains a non-solid phase bound inhibitor for the label of said labelled receptor, wherein said inhibitor is not acted upon by said label and directly inhibits said label from forming a detectable signal when said liquid phase containing complexes of receptor and analyte flows from said first zone and into said second zone, (iv) said third zone contains a solid phase bound, unlabelled receptor which specifically binds to complexes of analyte and labelled receptor but not to said inhibitor when liquid containing (a) complexes of analyte and labelled receptor and (b) inhibitor flow therein from said second zone, wherein said contacting is carried out under conditions favoring binding of said complex and said solid phase receptor, (v) removing said inhibitor from said third zone, and (vi) determining a detectable signal produced in said third zone by said label in said complex as a determination of said analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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11. Method for determining an analyte in a liquid sample comprising:
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(i) contacting a liquid sample to a zoned device containing a first and second zone which are in fluid contact with each other so as to permit flow of liquid from said first zone to said second zone, wherein (ii) said first zone contains both (a) at least one non-solid phase bound, labelled receptor which specifically binds to said analyte to form a complex of receptor and analyte upon contact with analyte containing liquid and (b) a non-solid phase bound inhibitor for the label of said labelled receptor, wherein said inhibitor is not acted upon by said label and directly inhibits said label from providing a detectable signal, (iii) said second zone contains a solid phase bound, unlabelled receptor which specifically binds to complexes of analyte and labelled receptor but not to said inhibitor when liquid containing (a) complexes of analyte and labelled receptor and (b) inhibitor flow therein from said first zone, wherein said contacting is carried out under conditions favoring binding of said complex and said solid phase receptor, (iv) removing said inhibitor from said second zone, and (v) determining a detectable signal produced in said second zone by said label in said complex as a determination of said analyte. - View Dependent Claims (15, 16)
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17. Multizone test apparatus useful in determining an analyte in a liquid sample, said test apparatus comprising a first zone in fluid contact with a second zone, and a third zone in fluid contact with said second zone, wherein:
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(i) said first zone contains at least one non-solid phase bound, label carrying receptor which specifically binds to said analyte, (ii) said second zone contains a non-solid phase bound inhibitor for the label of said unlabelled receptor, wherein said inhibitor is not acted upon by said label and directly inhibits said label from providing a detectable signal, and (iii) said third zone contains a solid phase bound, unlabelled receptor which specifically binds to a complex of said analyte and said first receptor. - View Dependent Claims (18, 19, 20)
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21. Multizone test apparatus useful in determining an analyte in a liquid sample, said test apparatus comprising a first zone in fluid contact with a second zone, wherein:
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(i) said first zone contains both at least one non-solid phase bound, labelled receptor which specifically binds to said analyte, and (b) a non-solid phase bound inhibitor for the label of said labelled receptor, wherein said inhibitor is not acted upon by said label and directly inhibits said label from providing a detectable signal, and (ii) a second zone containing a solid phase bound, unlabelled receptor which specifically binds to a complex of said analyte and said labelled receptor. - View Dependent Claims (22, 23, 24)
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Specification