Surface plasmon resonance technique for directly probing the interaction of DNA and graphene oxide and ultra-sensitive biosensing

Biosens Bioelectron. 2014 Aug 15:58:374-9. doi: 10.1016/j.bios.2014.03.002. Epub 2014 Mar 12.

Abstract

The binding of DNA with graphene oxide (GO) is important for applications in disease diagnosis, genetic screening, and drug discovery. The standard assay methods are mainly limited to indirect observation via fluorescence labeling. Here we report the use of surface plasmon resonance for direct sensing of DNA/GO binding. We show that this can be used for ultra-sensitive detection of single-stranded DNA (ssDNA). Furthermore, the results provide a more direct probe of DNA/GO binding abilities and confirm that hydrogen bonding plays a key role in the interaction between GO and ssDNA. This enables to a novel biosensor for highly sensitive and selective detection of ssDNA based on indirect competitive inhibition assay (ICIA). We report development of such a sensor with a linear dynamic range of 10(-14)-10(-6)M, a detection limit of 10fM and a high level of stability during repeated regeneration.

Keywords: Au nanoparticles; DNA; Graphene oxide; Hydrogen bond; Surface plasmon resonance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biosensing Techniques / instrumentation*
  • DNA / analysis*
  • DNA / chemistry*
  • Equipment Design
  • Equipment Failure Analysis
  • Gold / chemistry
  • Graphite / chemistry*
  • Metal Nanoparticles / chemistry
  • Metal Nanoparticles / ultrastructure
  • Molecular Probe Techniques*
  • Surface Plasmon Resonance / instrumentation*

Substances

  • Gold
  • Graphite
  • DNA