Ultrabright fluorescein-labeled antibodies near silver metallic surfaces

Joseph R. Lakowicz, Joanna Malicka, Jun Huang, Zygmunt Gryczynski, Ignacy Gryczynski

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Fluorescein-labeled antibodies are widely used in clinical assays and fluorescence microscopy. The fluorescent signal per labeled antibody is limited by fluorescein self-quenching, which occurs when the antibody is heavily labeled with multiple fluoresceins. We examined immunoglobulin G (IgG) when labeled with 0.7 to about 30 fluoresceins per antibody molecule. The extent of self-quenching was decreased, and the signal increased, when the labeled antibody was in close proximity to metallic silver particles. Time-resolved measurements showed that the intensity increase was due in part to a silver-induced increase in the radiative decay rate. These results suggest the use of labeled antibodies conjugated to silver particles as ultrabright probes for imaging or analytical applications.

Original languageEnglish
Pages (from-to)467-475
Number of pages9
Issue number6
StatePublished - 15 Aug 2004


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