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A direct competitive homogeneous immunoassay for progesterone - the Redox Quenching Immunoassay

  • 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.

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Author:Julia Ettlinger, Jörg A. Schenk, Burkhard Micheel, Eva Ehrentreich-Förster, Nenad Gajovic-Eichelmann
ISSN:1040-0397 (print)
Parent Title (English):Electroanalysis : an international journal devoted to fundamental and practical aspects of electroanalysis
Place of publication:Weinheim
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
Tag:Amperometry; Ferrocene; Immunoassay; Progesterone
First Page:1567
Last Page:1575
Funder:Fraunhofer Society [660035]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie
Peer Review:Referiert