Analytical and Bioanalytical Chemistry

, Volume 408, Issue 7, pp 1773–1781 | Cite as

Plasmonic SERS biosensing nanochips for DNA detection

  • Hoan T. Ngo
  • Hsin-Neng Wang
  • Andrew M. Fales
  • Tuan Vo-Dinh
Review
Part of the following topical collections:
  1. Analytical Applications of Biomimetic Recognition Elements

Abstract

The development of rapid, cost-effective DNA detection methods for molecular diagnostics at the point-of-care (POC) has been receiving increasing interest. This article reviews several DNA detection techniques based on plasmonic-active nanochip platforms developed in our laboratory over the last 5 years, including the molecular sentinel-on-chip (MSC), the multiplex MSC, and the inverse molecular sentinel-on-chip (iMS-on-Chip). DNA probes were used as the recognition elements, and surface-enhanced Raman scattering (SERS) was used as the signal detection method. Sensing mechanisms were based on hybridization of target sequences and DNA probes, resulting in a distance change between SERS reporters and the nanochip’s plasmonic-active surface. As the field intensity of the surface plasmon decays exponentially as a function of distance, the distance change in turn affects SERS signal intensity, thus indicating the presence and capture of the target sequences. Our techniques were single-step DNA detection techniques. Target sequences were detected by simple delivery of sample solutions onto DNA probe-functionalized nanochips and measuring the SERS signal after appropriate incubation times. Target sequence labeling or washing to remove unreacted components was not required, making the techniques simple, easy-to-use, and cost-effective. The usefulness of the nanochip platform-based techniques for medical diagnostics was illustrated by the detection of host genetic biomarkers for respiratory viral infection and of the dengue virus gene.

Keywords

DNA detection Multiplex DNA detection DNA biosensor Surface-enhanced Raman scattering Molecular sentinel-on-chip 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Hoan T. Ngo
    • 1
    • 2
  • Hsin-Neng Wang
    • 1
    • 2
  • Andrew M. Fales
    • 1
    • 2
  • Tuan Vo-Dinh
    • 1
    • 2
    • 3
  1. 1.Department of Biomedical EngineeringDuke UniversityDurhamUSA
  2. 2.Fitzpatrick Institute for PhotonicsDuke UniversityDurhamUSA
  3. 3.Department of ChemistryDuke UniversityDurhamUSA

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