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Clinical Chemistry, Vol 41, 1391-1397, Copyright © 1995 by American Association for Clinical Chemistry
G Mathis
CIS Bio International, Bagnols sur Ceze, France.
A homogeneous assay method based on the long-lived fluorescence of rare earth cryptates and amplification by nonradiative energy transfer has been developed for immunoassays. The principles of the assay allow a double discrimination of the emitted signal through spectral and temporal selectivity. The cage structure of the complex, ion pairing around europium, as well as double-wavelength detection, fully shield the assay from perturbations of media. Events based on short-range interactions involving biomolecules are of tremendous importance in many domains of biology, either for analytical purposes or for molecular mechanism studies. Therefore, the principles and the reagents used to devise this homogeneous assay were adapted to various models representative of molecular and cellular processes and were chosen from the signaling pathways involved in cellular communication and expression: epidermal growth factor (EGF) receptor-ligand interaction, EGF receptor kinase activity, Jun/Fos protein-protein interaction, and DNA hybridization. Evaluation of the homogeneous assays yielded results compatible with those from comparison assays and demonstrates the versatility and wide range of applicability of this methodology.
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