DNA polymorphism sensitive impedimetric detection on gold-nanoislands modified electrodes

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

© 2015 Elsevier B.V. All rights reserved. Nanocomposite materials are being increasingly used in biosensing applications as they can significantly improve biosensor performance. Here we report the use of a novel impedimetric genosensor based on gold nanoparticles graphite-epoxy nanocomposite (nanoAu-GEC) for the detection of triple base mutation deletion in a cystic-fibrosis (CF) related human DNA sequence. The developed platform consists of chemisorbing gold nano-islands surrounded by rigid, non-chemisorbing, and conducting graphite-epoxy composite. The ratio of the gold nanoparticles in the composite was carefully optimized by electrochemical and microscopy studies. Such platform allows the very fast and stable thiol immobilization of DNA probes on the gold islands, thus minimizing the steric and electrostatic repulsion among the DNA probes and improving the detection of DNA polymorphism down to 2.25 fmol by using electrochemical impedance spectroscopy. These findings are very important in order to develop new and renewable platforms to be used in point-of-care devices for the detection of biomolecules.
Original languageEnglish
Pages (from-to)95-101
JournalTalanta
Volume136
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • Cyctic fibrosis
  • DNA polymorphism
  • Electrochemical impedance spectroscopy
  • Gold nanocomposite
  • Gold nanoparticles amplification

Fingerprint

Dive into the research topics of 'DNA polymorphism sensitive impedimetric detection on gold-nanoislands modified electrodes'. Together they form a unique fingerprint.

Cite this