Metal-Enhanced Immunoassays

  • Ignacy GryczynskiEmail author
  • Rafal Luchowski
  • Evgenia G. Matveeva
  • Tanya Shtoyko
  • Pabak Sarkar
  • Julian Borejdo
  • Irina Akopova
  • Zygmunt Gryczynski
Part of the Methods in Molecular Biology book series (MIMB, volume 875)


The surface-confined assay format is one of the most convenient detection formats used in many immunoassays. Fluorescence emission from monolayers of dyes requires a strong excitation and good detection system. Such samples are susceptible to artifacts due to background fluorescence from substrates. We demonstrate that using silver nanostructures deposited on the slide substrate can significantly enhance measured fluorescence, reduce unwanted background and increase photostability of the used probes. Using thin layers of polymer doped with fluorescein, we tested two nanostructures—silver island films (SIFs) deposited on glass slides and self-assembled colloidal structures (SACS) deposited on thin silver film. The SACS surfaces show extraordinary fluorescence enhancements: over 100-folds in hot spots. We applied these surfaces for enhanced Alexa488 model immunoassay.

Key words

Fluorescence enhancement Alexa488 Silver nanoparticles Immunoassay Plasmonics 



This work was supported by Texas Emerging Technologies Fund Grant, NIH HG 004364 and R01AR048622, NSF DBI-0649889, and ARPATP Project 000130-0042-2007. RL is the recipient of the Research Mobility program from the Polish Ministry of Science and Higher Education. TS was supported by Research Corporation for Science Advancement (CCSA 7748) and The Welch Foundation (BP-0037).


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ignacy Gryczynski
    • 1
    Email author
  • Rafal Luchowski
    • 2
  • Evgenia G. Matveeva
    • 3
  • Tanya Shtoyko
    • 4
  • Pabak Sarkar
    • 3
  • Julian Borejdo
    • 3
  • Irina Akopova
    • 3
  • Zygmunt Gryczynski
    • 1
  1. 1.Center for Commercialization of Fluorescence TechnologiesUniversity of North Texas Health Science CenterFort WorthUSA
  2. 2.Department of Biophysics, Institute of PhysicsMaria Curie-Sklodowska UniversityLublinPoland
  3. 3.Department of Molecular Biology and Immunology, Center for Commercialization of Fluorescence TechnologiesUniversity of North Texas Health Science CenterFort WorthUSA
  4. 4.University of Texas at TylerTylerUSA

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