Magnetically assisted binding assays utilizing a magnetically responsive reagent
First Claim
1. A method for determining the presence or amount of an analyte in a test sample, said method comprising the steps of:
- (a) contacting said test sample with both a mobile solid phase reagent and a magnetically responsive reagent to form a reaction mixture, said analyte being capable of specifically binding to both said mobile solid phase reagent and said magnetically responsive reagent to form a complex comprising said mobile solid phase reagent, said magnetically responsive reagent, and said analyte;
(b) subjecting said reaction mixture to a magnetic field such that a magnetic force is exerted upon said complex if said complex is present in said reaction mixture, the influence of said magnetic force being manifested by the movement or capture of said complex at a different rate from that of said magnetically responsive reagent alone or from that of said mobile solid phase reagent alone; and
(c) measuring the degree of said manifestation to provide a measure of the presence or amount of said analyte in said test sample.
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Abstract
Assay methods utilizing the response of a magnetically responsive reagent to the influence of a magnetic field to qualitatively or quantitatively measure binding between specific binding pair members. According to the invention, the presence of an analyte mediates whether or not the magnetically responsive reagent binds to a mobile solid phase reagent. The extent of binding will modulate the response of the magnetically responsive reagent or that of the mobile solid phase reagent, or both, to the influence of a magnetic field. Hence, by measuring the response to the magnetic field of the magnetically responsive reagent, or that of the mobile solid phase reagent, the presence or amount of analyte contained in a test sample can accurately be determined. The invention utilizes various devices to carry out the assay methods described.
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Citations
44 Claims
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1. A method for determining the presence or amount of an analyte in a test sample, said method comprising the steps of:
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(a) contacting said test sample with both a mobile solid phase reagent and a magnetically responsive reagent to form a reaction mixture, said analyte being capable of specifically binding to both said mobile solid phase reagent and said magnetically responsive reagent to form a complex comprising said mobile solid phase reagent, said magnetically responsive reagent, and said analyte; (b) subjecting said reaction mixture to a magnetic field such that a magnetic force is exerted upon said complex if said complex is present in said reaction mixture, the influence of said magnetic force being manifested by the movement or capture of said complex at a different rate from that of said magnetically responsive reagent alone or from that of said mobile solid phase reagent alone; and (c) measuring the degree of said manifestation to provide a measure of the presence or amount of said analyte in said test sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining the presence or amount of an analyte in a test sample, said method comprising the steps of:
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(a) contacting said test sample with a magnetically responsive reagent and a mobile solid phase reagent to form a reaction mixture, said analyte being capable of specifically binding to said magnetically responsive reagent to form a first complex comprising said analyte and said magnetically responsive reagent and said magnetically responsive reagent being capable of specifically binding to said mobile solid phase reagent to form a second complex comprising said magnetically responsive reagent and said mobile solid phase reagent; (b) subjecting said reaction mixture to a magnetic field such that a magnetic force is exerted upon said complexes if either of said complexes is present in said reaction mixture, the influence of said magnetic force being manifested by the movement or capture of said second complex at a different rate from that of said magnetically responsive reagent alone or from that of said mobile solid phase reagent alone or said first complex; and (c) measuring the degree of the manifestation to provide a measure of the presence or amount of said analyte in said test sample. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for determining the presence or amount of an analyte in a test sample, said method comprising the steps of:
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(a) contacting said test sample with a magnetically responsive reagent and a mobile solid phase reagent to form a reaction mixture, said analyte being capable of specifically binding to said mobile solid phase reagent to form a first complex comprising said analyte and said mobile solid phase reagent and said magnetically responsive reagent being capable of specifically binding to said mobile solid phase reagent to form a second complex comprising said magnetically responsive reagent and said mobile solid phase reagent; (b) subjecting said reaction mixture to a magnetic field such that a magnetic force is exerted upon said complexes if either of said complexes is present in said reaction mixture, the influence of said magnetic force being manifested by the movement or capture of said second complex at a different rate from that of said magnetically responsive reagent alone or from that of said mobile solid phase reagent alone or said first complex; and (c) measuring the degree of the manifestation to provide a measure of the presence or amount of said analyte in said test sample. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method for determining the presence or amount of an analyte in a test sample, said method comprising the steps of:
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(a) contacting said test sample with at least two different magnetically responsive reagents to form a reaction mixture, said analyte being capable of specifically binding to said at least two of said different magnetically responsive reagents to form a complex comprising said analyte and said at least two different magnetically responsive reagents; (b) subjecting said reaction mixture to a magnetic field such that a magnetic force is exerted upon said complex, the influence of said magnetic force being manifested by the movement or capture of said complex at a different rate from that of said different magnetically responsive reagents alone; and (c) measuring the degree of said manifestation to provide a measure of the presence or amount of said analyte in said test sample. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification