Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Label-Free Electrochemical DNA Detection Based on Electrostatic Interaction between DNA and Ferrocene Dendrimers

  • Lee, Ji-Young (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kim, Byung-Kwon (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Hwang, Seong-Pil (Department of Chemistry, Myongji University) ;
  • Lee, Young-Hoon (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kwak, Ju-Hyoun (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST))
  • Received : 2010.06.29
  • Accepted : 2010.08.29
  • Published : 2010.11.20
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Abstract

A label-free DNA detection method was developed for a simple electrochemical DNA sensor with a short assay time. Self-assembled monolayers of peptide nucleic acid were used as a probe on gold electrodes. The formation of the self-assembled monolayers on the gold electrodes was successfully checked by means of cyclic voltammetry. The target DNA, hybridized with peptide nucleic acid, can be detected by the anodic peak current of ferrocene dendrimers, which interact electrostatically with the target DNA. This anodic peak current was measured by square wave voltammetry at 0.3 V to decrease the detection limit on the order of the nanomolar concentrations. As a result, the label-free electrochemical DNA sensor can detect the target DNA in concentrations ranging from 1 nM to $1\;{\mu}M$ with a detection limit of 1 nM.

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