Submitted to: Analytical Chemist
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/4/2010
Publication Date: 12/1/2010
Publication URL: http://pubs.acs.org/doi/abs/10.1021/ac1023843
Citation: Zhang, H., Harpster, M.H., Park, H.J., Johnson, P.A., Wilson, W.C. 2010. Surface-enhanced Raman scattering detection of DNA derived from the West Nile virus genome using magnetic capture of Raman-active gold nanoparticles . Analytical Chemist. 83:254-260. Interpretive Summary: The global economy and warming has increased the need for rapid detection of introduced insect transmitted pathogens such as West Nile virus (WNV). A model rapid detection assay using nanotechnology was demonstrated for WNV genome that due to short reaction times can be conduced reproducibly. This system provides a novel diagnostic tool that is amenable to adaptation within a portable, user-friendly detection platform for nucleic acids.
Technical Abstract: A model paramagnetic nanoparticle (MNP) assay is demonstrated for surface-enhanced Raman scattering (SERS) detection of DNA oligonucleotides derived from the West Nile virus (WNV) genome. Detection is based on the capture of WNV target sequences by hybridization with complementary oligonucleotide probes covalently linked to fabricated MNPs and Raman reporter tag conjugated gold nanoparticles (GNPs) and the subsequent removal of GNP-WNV target sequence-MNP hybridization complexes from solution by an externally applied magnetic source. Laser excitation of the pelleted material provided a signature SERS spectrum which is diagnostic for the reporter, 5,5!-dithiobis (succinimidy-2-nitrobenzoate) (DSNB), and restricted to hybridization reactions containing WNV target sequences. Hybridizations containing dilutions of the target oligonucleotide were characterized by a reduction in the intensification of the spectral peaks accorded to the SERS signaling of DSNB, and the limit of detection for target sequence in buffer was 10 pM. Due to the short hybridization times required to conduct the assay and ease with which reproducible Raman spectra can be acquired, the assay is amenable to adaptation within a portable, user-friendly Raman detection platform for nucleic acids.