Competitive immunofluorescence assay and test kit
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United States of America Patent
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Oct 22, 1985
Issued Date -
N/A
app pub date -
May 27, 1983
filing date -
May 6, 1983
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Abstract
Competitive immunofluorescence assays for antigens in which immune complexes are precipitated with a nonfluorescent, nonlight-scattering precipitant such as polyethylene glycol and the resulting immunoprecipitate is dissolved with a nonfluorescent solvent of low ionic strength that maintains the pH of the solution substantially constant for immunofluorescence intensity reading. The assays are carried out by incubating the sample with fluorescent-labeled antigen, anti-antigen antibody, and a secondary antibody to the anti-antigen antibody followed by addition of the precipitant to form an immunoprecipitate. The precipitate is separated by centrifuging, dissolved in the solvent, and the immunofluorescence intensity of the solution is read with a fluorometer and compared to a standard curve.
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