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Published on: October 31, 2013
Label-free DNA detection using the narrow side of funnel-type etched nanopores
Yohai Mandabi1, Dietmar Fink, Lital Alfonta
1Avram and Stella Goldstein-Goren Department of Biotechnology Engineering and the Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, PO Box 653, Beer-Sheva 84105, Israel.
Abstract:
A sensitive; simple and label-free method for DNA detection is presented. Irradiated polyethylene terephthalate foils were etched to present conical tracks at a density of approximately 5×10⁷ tracks per cm². Probe DNA was immobilized at the narrow opening of the tracks (2-4 nm diameter). The presence of target DNA resulted in changes in both conductance and rectification ratios in a concentration-dependent manner. DNA concentrations as low as 2 nM could be detected using this simple two-step detection scheme.

