Fluorescence spectral properties of cyanine dye labeled DNA near metallic silver particles

Joanna Malicka, Ignacy Gryczynski, Badri P. Maliwal, Jiyu Fang, Joseph R. Lakowicz

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Recent studies have demonstrated theft silver metallic particles can increase the quantum yield and decrease the lifetimes of nearby fluorophores. These studies are extended to double stranded DNA oligomers labeled with N,N′-(dipropyl)-tetramethylindocarbocyanine (Cy3) or N,N-(dipropyl)-tetramethylindodicarbocyanine (Cy5). The proximity to silver particles increases the apparent quantum yields and decreases the lifetimes of the double helical DNA 23-mer labeled individually with Cy3 or Cy5. The decreased lifetimes are accompanied by apparently increased photostability of the labeled oligomers near silver particles. Because of spatial averaging across the sample these results are likely to significantly underestimate the effects of silver particles on labeled DNA localized at an optimal distance from the metallic surface. These results suggest that DNA arrays fabricated on substrates with silver particles can display increased sensitivity and photostability in the analysis of gene expression.

Original languageEnglish
Pages (from-to)96-104
Number of pages9
JournalBiopolymers - Biospectroscopy Section
Issue number2
StatePublished - 27 Mar 2003


  • Cyanine dye
  • DNA
  • Fluorescence
  • Silver particles
  • Spectral properties


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