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A direct competitive homogeneous immunoassay for progesterone - The redox quenching immunoassay

By J. Ettlinger, J.A. Schenk, B. Micheel, E. Ehrentreich-Förster and N. Gajovic-Eichelmann

Abstract

A direct competitive amperometric immunoassay format for the detection of haptens and proteins was developed. The method is based on the quenching of electroactivity of ferrocenium, which is coupled to the antigen and used as the primary reporter, upon binding to a monoclonal anti-ferrocenium antibody, which is coupled to the detection antibody and used as a secondary reporter. A separation-free progesterone immunoassay with a lower detection limit of 1 ng?mL-1 (3.18 nmol?L-1) in 1?:?2 diluted blood serum was realised by combining two bifunctional conjugates, a ferrocenium-PEG-progesterone tracer and a bioconjugate of one anti-progesterone and one anti-ferrocenium antibody. The immune complex is formed within 30 s upon addition of progesterone, resulting in a total analysis time of 1.5 min

Year: 2012
DOI identifier: 10.1002/elan.201200107
OAI identifier: oai:fraunhofer.de:N-211625
Provided by: Fraunhofer-ePrints
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