Direct surface-enhanced Raman scattering analysis of DNA duplexes

Luca Guerrini, Željka Krpetić, Danny van Lierop, Ramon A. Alvarez-Puebla, Duncan Graham

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)
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The exploration of the genetic information carried by DNA has become a major scientific challenge. Routine DNA analysis, such as PCR, still suffers from important intrinsic limitations. Surface-enhanced Raman spectroscopy (SERS) has emerged as an outstanding opportunity for the development of DNA analysis, but its application to duplexes (dsDNA) has been largely hampered by reproducibility and/or sensitivity issues. A simple strategy is presented to perform ultrasensitive direct label-free analysis of unmodified dsDNA with the means of SERS by using positively charged silver colloids. Electrostatic adhesion of DNA promotes nanoparticle aggregation into stable clusters yielding intense and reproducible SERS spectra at nanogram level. As potential applications, we report the quantitative recognition of hybridization events as well as the first examples of SERS recognition of single base mismatches and base methylations (5-methylated cytosine and N6-methylated Adenine) in duplexes.

Original languageEnglish
Pages (from-to)1144-1148
Number of pages5
JournalAngewandte Chemie International Edition
Issue number4
Early online date20 Nov 2014
Publication statusPublished - 19 Jan 2015


  • DNA
  • hybridization
  • methylated bases
  • single-base mismatch
  • surface-enhanced raman spectroscopy


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