A1 Refereed original research article in a scientific journal
Fluorescent nanoparticles as labels for immunometric assay of C-reactive protein using two-photon excitation assay technology
Authors: Koskinen J., Vaarno J., Meltola N., Soini J., Hänninen P., Luotola J., Waris M., Soini A.
Publication year: 2004
Journal:: Analytical Biochemistry
Journal name in source: Analytical Biochemistry
Volume: 328
Issue: 2
First page : 210
Last page: 218
Number of pages: 9
ISSN: 0003-2697
DOI: https://doi.org/10.1016/j.ab.2004.02.029
Web address : http://api.elsevier.com/content/abstract/scopus_id:2142770220
Abstract
We describe the use of fluorophore-doped nanoparticles as reporters in a recently developed ArcDia TPX bioaffinity assay technique. The ArcDia TPX technique is based on the use of polymer microspheres as solid-phase reaction carrier, fluorescent bioaffinity reagents, and detection of two-photon excited fluorescence. This new assay technique enables multiplexed, separation-free bioaffinity assays from microvolumes with high sensitivity. As a model analyte we chose C-reactive protein (CRP). The assay of CRP was optimized for assessment of CRP baseline levels using a nanoparticulate fluorescent reporter, 75nm in diameter, and the assay performance was compared to that of CRP assay based on a molecular reporter of the same fluorophore core. The results show that using fluorescent nanoparticles as the reporter provides two orders of magnitude better sensitivity (87fM) than using the molecular label, while no difference between precision profiles of the different assay types was found. The new assay method was applied for assessment of baseline levels of CRP in sera of apparently healthy individuals. © 2004 Elsevier Inc. All rights reserved.
We describe the use of fluorophore-doped nanoparticles as reporters in a recently developed ArcDia TPX bioaffinity assay technique. The ArcDia TPX technique is based on the use of polymer microspheres as solid-phase reaction carrier, fluorescent bioaffinity reagents, and detection of two-photon excited fluorescence. This new assay technique enables multiplexed, separation-free bioaffinity assays from microvolumes with high sensitivity. As a model analyte we chose C-reactive protein (CRP). The assay of CRP was optimized for assessment of CRP baseline levels using a nanoparticulate fluorescent reporter, 75nm in diameter, and the assay performance was compared to that of CRP assay based on a molecular reporter of the same fluorophore core. The results show that using fluorescent nanoparticles as the reporter provides two orders of magnitude better sensitivity (87fM) than using the molecular label, while no difference between precision profiles of the different assay types was found. The new assay method was applied for assessment of baseline levels of CRP in sera of apparently healthy individuals. © 2004 Elsevier Inc. All rights reserved.
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