Method for detecting analyte(s) using magnetic colloidal particles
First Claim
1. A method for detecting or quantifying at least one analyte in a liquid medium, said method comprising:
- providing magnetic colloidal particles functionalized at the surface with at least one ligand specific for an analyte to be detected or assayed;
pretreating the medium to be analyzed beforehand in order to make the analyte being sought reactive with respect to at least two molecules of one of its specific ligands, wherein the pretreatment comprises functionalizing the analyte with one of the partners of a high affinity binding couple;
bringing said particles into contact with said medium to be analyzed;
applying a continuous magnetic field to said medium, at a strength sufficient to cause said magnetic particles to be structured in the form of chains;
maintaining said continuous magnetic field for a period of time sufficient to enable coupling or combination of at least one of the analytes concerned with at least two specific ligands present respectively on two consecutive neighboring particles of a chain;
removing the magnetic field after the period of time sufficient to enable coupling or combination of at least one of the analytes; and
determining the presence or absence of at least one of the analytes after removing the magnetic field and, where appropriate, a respective concentration of at least one analyte by the presence or absence of permanent chain(s) of magnetic colloidal particles.
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Abstract
The invention concerns a method for detecting and/or quantifying at least an analyte in a liquid medium, characterized in that it consists in using magnetic colloidal particles functionalized at the surface with at least a ligand specific of the analyte to be detected and/or assayed and in that it comprises: contacting said particles with said medium to be analyzed; applying a magnetic field to said medium, at an intensity sufficient to cause said magnetic particles to be structured in the form of chains; maintaining said magnetic field for a sufficient time interval to enable coupling or combination of the analyte concerned with at least two specific ligands present respectively on two neighbouring particles of a chain; cancelling the magnetic field, and determining the presence and/or absence of said analyte and, as the case may be, its concentration via the presence and/or the absence of said permanent chains of magnetic particles.
47 Citations
24 Claims
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1. A method for detecting or quantifying at least one analyte in a liquid medium, said method comprising:
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providing magnetic colloidal particles functionalized at the surface with at least one ligand specific for an analyte to be detected or assayed; pretreating the medium to be analyzed beforehand in order to make the analyte being sought reactive with respect to at least two molecules of one of its specific ligands, wherein the pretreatment comprises functionalizing the analyte with one of the partners of a high affinity binding couple; bringing said particles into contact with said medium to be analyzed; applying a continuous magnetic field to said medium, at a strength sufficient to cause said magnetic particles to be structured in the form of chains; maintaining said continuous magnetic field for a period of time sufficient to enable coupling or combination of at least one of the analytes concerned with at least two specific ligands present respectively on two consecutive neighboring particles of a chain; removing the magnetic field after the period of time sufficient to enable coupling or combination of at least one of the analytes; and determining the presence or absence of at least one of the analytes after removing the magnetic field and, where appropriate, a respective concentration of at least one analyte by the presence or absence of permanent chain(s) of magnetic colloidal particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification