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DNA hybridization using surface plasmon-coupled emission.

Joanna Malicka1, Ignacy Gryczynski, Zygmunt Gryczynski

  • 1Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201, USA.

Analytical Chemistry
|December 4, 2003
PubMed
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This study introduces surface plasmon-coupled emission (SPCE) for DNA hybridization detection. SPCE enhances sensitivity and specificity in nucleic acid analysis by coupling fluorophore emission to surface plasmons.

Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Surface plasmon-coupled emission (SPCE) involves coupling excited fluorophores with electron oscillations in thin metal films.
  • This coupling causes surface plasmons to radiate energy into a glass substrate at a specific angle, mirroring the fluorophore's emission spectrum.

Purpose of the Study:

  • To develop and evaluate a novel method for measuring DNA hybridization using SPCE.
  • To investigate the sensitivity and specificity enhancements offered by SPCE in detecting nucleic acid binding.

Main Methods:

  • Utilizing thin silver films on glass prisms to facilitate SPCE.
  • Employing Cy3-labeled DNA oligomers hybridized to complementary, surface-bound unlabeled oligomers.
  • Analyzing emission intensity and spectral profiles under different illumination conditions (sample side vs. through prism).

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Main Results:

  • Hybridization of DNA oligomers resulted in observable SPCE.
  • Directional SPCE was detected, with sensitivity enhanced by illumination through the prism at the surface plasmon angle.
  • SPCE demonstrated specificity by suppressing emission from non-complementary DNA, attributed to fluorophore proximity to the silver surface.

Conclusions:

  • SPCE provides a sensitive and specific method for detecting DNA hybridization.
  • The technique leverages fluorophore proximity to metal surfaces for signal enhancement and interference reduction.
  • SPCE shows significant potential for applications in nucleic acid analysis and bioaffinity measurements.