Nanoparticles biosensor
First Claim
1. A displacement competition assay for determining sample analyte concentration in a sample fluid, comprising:
- (i) applying said sample fluid to a test surface having a binding agent bound through specific recognition sites to an immobilized analyte, wherein said immobilized analyte is affixed to a solid support and said binding agent is labelled with phages encapsulating reporter particles, said reporter particles providing a base level signal; and
(ii) binding said sample analyte to at least one of said specific recognition sites wherein binding of said sample analyte to said specific recognition site displaces said labelled binding agent away from said test surface into said sample fluid to define a test level signal, wherein displacement of said labelled binding agent is related to the concentration of sample analyte in said sample fluid;
(iii) removing said sample fluid from said test surface; and
(iv) comparing said base level signal to said test level signal to determine the concentration of said sample analyte.
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Accused Products
Abstract
Biosensor technology based on the labelling entities having particle reporters provides cost competitive readily manufactured assay devices. Sub-micron particles of uniform dimension in metals, polymers, glasses, ceramics and biological structures such as phages are used as the labelling entities. Such reporter particles greatly increase the sensitivity and accuracy, and provide a variety of assay techniques for determining analyte presence in a sample. The particles may have dielectric, paramagnetic and/or phosphorescent properties, such particles are particularly useful in a variety of competition type assays. Novel phosphor and phage particles are provided for use as unique labelling entities.
407 Citations
13 Claims
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1. A displacement competition assay for determining sample analyte concentration in a sample fluid, comprising:
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(i) applying said sample fluid to a test surface having a binding agent bound through specific recognition sites to an immobilized analyte, wherein said immobilized analyte is affixed to a solid support and said binding agent is labelled with phages encapsulating reporter particles, said reporter particles providing a base level signal; and (ii) binding said sample analyte to at least one of said specific recognition sites wherein binding of said sample analyte to said specific recognition site displaces said labelled binding agent away from said test surface into said sample fluid to define a test level signal, wherein displacement of said labelled binding agent is related to the concentration of sample analyte in said sample fluid; (iii) removing said sample fluid from said test surface; and (iv) comparing said base level signal to said test level signal to determine the concentration of said sample analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification