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Related Experiment Video

Updated: May 14, 2026

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
09:43

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Published on: October 31, 2013

Statistics of DNA capture by a solid-state nanopore.

Mirna Mihovilovic1, Nicholas Hagerty, Derek Stein

  • 1Physics Department, Brown University, Providence, Rhode Island 02912, USA.

Physical Review Letters
|February 7, 2013
PubMed
Summary

Solid-state nanopores capture DNA molecules, with studies showing a bias for end-capture due to configurational entropy, not favorable configurations. This research quantifies translocation speed and folding dynamics.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Solid-state nanopores are utilized for analyzing biological molecules.
  • Electrophoretic forces can drive DNA molecules through nanopores.
  • The configuration of DNA during nanopore translocation influences signal interpretation.

Purpose of the Study:

  • To investigate the capture mechanism of DNA molecules by solid-state nanopores.
  • To determine the factors contributing to the observed capture bias.
  • To analyze the dynamics of DNA translocation, including speed and folding.

Main Methods:

  • Experimental setup using an 8-nm-wide solid-state nanopore.
  • Electrophoretic manipulation of DNA molecules.
  • Statistical analysis of ionic current signals to determine capture location.
  • Development of a theoretical model to explain capture bias.
  • Quantification of translocation speed and length dependence for folded DNA.

Main Results:

  • A significant bias was observed, favoring the capture of DNA molecules near their ends.
  • Theoretical modeling indicated that configurational entropy, not energetic favorability, drives this capture bias.
  • Fluctuations and length dependence of translocation speed for simultaneously translocating polymer segments were quantified.

Conclusions:

  • The end-capture bias in nanopore experiments is primarily governed by polymer configurational entropy.
  • Understanding these capture dynamics is crucial for accurate DNA analysis using nanopores.
  • The study provides insights into the physics of polymer translocation and folding within nanopores.