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Direct surface-enhanced raman scattering analysis of DNA duplexes

Guerrini, L, Krpetic, Z, Van Lierop, D, Alvarez-Puebla, RA and Graham, D 2014, 'Direct surface-enhanced raman scattering analysis of DNA duplexes' , Angewandte Chemie International Edition, 54 (4) , pp. 1144-1148.

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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.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Biomedical Research Centre
Journal or Publication Title: Angewandte Chemie International Edition
Publisher: John Wiley & Sons, Inc.
ISSN: 14337851
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Funders: Spanish Ministerio de Economia y Competitividad, European Research Council, PrioSERS
Depositing User: Dr Zeljka Krpetic
Date Deposited: 06 Oct 2016 15:05
Last Modified: 06 Oct 2016 15:05

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