Assay for the free portion of substances in biological fluids

Chemistry: analytical and immunological testing – Thyroid hormone tests

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436501, 436504, 436505, 436800, 436804, 436815, 436817, 422 61, G01N 33567, G01N 33566, G01N 3353, B65D 6900

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active

048392995

ABSTRACT:
A biological sample containing an analyte, partly free and partly bound to natural binders, is incubated with a labelled specific binder for the analyte and a derivative of the analyte which does not react with the natural binders. Part of the labelled specific binder binds to the analyte derivative, the proportion depending on the free analyte concentration in the sample. The proportion is measured and used to determine the free analyte concentration. For example, the analyte may be thyroxine or cortisol, the labelled specific binder may be an antibody thereto, and the analyte derivative may be in the form of a solid matrix. The labelled specific binder should have an affinity for the analyte, expressed as a dissociation constant of the complex of the two, approximately equal to the concentration of free analyte in the sample.

REFERENCES:
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patent: 4366143 (1982-12-01), Midgley et al.
patent: 4426453 (1984-01-01), Greg et al.
Ekins, "Free Hormones in Blood", Elsevier Biomedical Press (1982), pp. 73-90.
Ekins, "The Direct Immunoassay of Free (Non-Protein Bound), Hormones in Body Fluids", pp. 192-219.
"Radioimmunoassay and Related Procedures in Medicine", IAEA, Vienna (1982), pp. 191-219.
Miles et al, from Principles of Competitive Protein-Binding Assays, Eds. Odell et al, J. B. Lippincott Co., Philadelphia, 1971, pp. 260-287.
Ekeke et al, J. Ster. Biochem., 11(1979), 1597-1600.
Halliday et al, 96(2), 298-300, (1978).

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