A highly sensitive DNA sensor for attomolar detection of the BRCA1 gene: signal amplification with gold nanoparticle clusters

Analyst. 2015 Apr 21;140(8):2713-8. doi: 10.1039/c5an00004a. Epub 2015 Feb 18.

Abstract

Single stranded DNA fragments were conjugated onto gold nanoparticles leading to the formation of gold nanoparticle clusters upon hybridization with complementary strands. These clusters were successfully implemented for signal amplification in an electrochemical DNA sensor based on a graphene substrate. The sensor exhibited excellent sensitivity and selectivity with a detection limit of 50 attomolar target DNA.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Biosensing Techniques / methods*
  • DNA / analysis*
  • DNA / chemistry
  • DNA, Single-Stranded / chemistry
  • DNA, Single-Stranded / genetics
  • Electrochemistry
  • Genes, BRCA1*
  • Gold / chemistry*
  • Limit of Detection*
  • Metal Nanoparticles / chemistry*
  • Models, Molecular
  • Nucleic Acid Conformation
  • Nucleic Acid Hybridization

Substances

  • DNA, Single-Stranded
  • Gold
  • DNA