Nanopore detection of double stranded DNA using a track-etched polycarbonate membrane

KEÇECİ K., SAN N., Kaya D.

TALANTA, vol.144, pp.268-274, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 144
  • Publication Date: 2015
  • Doi Number: 10.1016/j.talanta.2015.06.005
  • Journal Name: TALANTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.268-274
  • Keywords: Resistive-pulse, Track-etched polymer membrane, DNA, Conically shaped nanopore, Biosensing, SINGLE-MOLECULE DETECTION, RESISTIVE-PULSE, ARTIFICIAL NANOPORE, LABEL-FREE, NANOPARTICLES, NANOPIPETTES, FABRICATION, TRANSPORT, SENSORS
  • Yıldız Technical University Affiliated: Yes

Abstract

We investigate the resistive-pulse sensing of 50-bp DNA using track-etched polycarbonate (PC) nanopores and show the translocation dynamics originating from the electrophoretic transport of DNAs. Conically shaped PC nanopore membranes have been prepared with asymmetric chemical etching technique. We show the potential and concentration dependence of DNA translocation through a PC nanopore. We find that the translocation of DNA scales linearly with both potential and concentration. Additionally, the threshold potential is determined to complete the translocation. Finally, by investigating the current-pulse amplitudes of nanopores with different tip sizes, we show that the nanopore size can be successfully used to distinguish the DNA molecules. These results suggest great promise for the sensing of short DNAs and understanding the dynamics of the translocation process using chemically-etched PC nanopores. (C) 2015 Elsevier B.V. All rights reserved.