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Constructing a Nanopipette-Based DNA Electromechanical Device.

Cengiz J Khan1, Oliver J Irving1, Rand A Al-Waqfi1

  • 1School of Chemistry, Edgbaston Campus, University of Birmingham, Birmingham B15 2TT, United Kingdom.

Nano Letters
|December 15, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to trap DNA structures in nanopipette sensors using nanoparticle capping. This enables repeated analysis of single DNA molecules, improving sensor efficiency and expanding applications in biopolymer analysis.

Keywords:
DNA nanotechnologynanoelectromechanicalnanoparticlesnanopipettestrapping

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Area of Science:

  • Nanotechnology and Nanoscience
  • Biophysics and Molecular Biology
  • Analytical Chemistry

Background:

  • Solid-state nanopore and nanopipette sensors are crucial for analyzing biopolymers like DNA and proteins.
  • Current methods require analyzing numerous molecules for statistically significant data, limiting sensor applicability and workflow efficiency.
  • A need exists for methods that allow repeated analysis of individual biopolymer structures.

Purpose of the Study:

  • To develop a novel strategy for trapping DNA structures within the sensing region of a nanopipette.
  • To enable repeated, high-resolution analysis of individual DNA molecules.
  • To enhance the utility and applicability of nanopipette sensing technology.

Main Methods:

  • End-functionalization of DNA structures.
  • Nanoparticle capping of functionalized DNA.
  • Trapping nanoparticle-DNA constructs within a nanopipette tip.
  • Development of descriptors to characterize construct insertion and presence.
  • Assessment of construct mobility and responsiveness to electric fields.

Main Results:

  • A robust method for trapping DNA structures in nanopipettes via nanoparticle capping was successfully developed.
  • Descriptors were established to effectively characterize nanoparticle-DNA constructs within the nanopipette.
  • The trapped DNA constructs demonstrated sustained mobility and responsiveness to electric fields, allowing for prolonged sensing.

Conclusions:

  • The end-functionalization and nanoparticle capping strategy effectively immobilizes DNA structures in nanopipettes for sensing.
  • This approach facilitates repeated readout of the same DNA structure, significantly improving data acquisition efficiency.
  • The method opens avenues for new applications, including in-flow sensing and analysis within confined environments.