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A thin permeable-membrane device for single-molecule manipulation.

Chang-Young Park1, David R Jacobson2, Dan T Nguyen3

  • 1Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.

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|February 1, 2016
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Summary
This summary is machine-generated.

This study introduces a thin microfluidic device for single-molecule manipulation, enabling solution changes via diffusion without fluid flow. This innovation preserves precious samples and is compatible with high-resolution magnetic tweezer experiments.

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Area of Science:

  • Biophysics
  • Microfluidics
  • Biomolecular Engineering

Background:

  • Single-molecule manipulation offers high-resolution insights into biomolecular structure and elasticity.
  • Conventional methods using direct fluid flow perturb sensitive measurements and risk sample loss.
  • Existing permeable-membrane devices are too thick for dual-sided instrumentation setups.

Purpose of the Study:

  • To develop a thin microfluidic device for single-molecule studies compatible with instruments requiring simultaneous dual-sided access.
  • To enable solution condition changes via diffusion, avoiding direct fluid flow and sample advection.
  • To demonstrate the device's utility in high-resolution force spectroscopy experiments.

Main Methods:

  • Fabrication of a thin (∼500 μm) microfluidic flow cell using glass coverslips and a plastic gasket.
  • Creation of in situ permeable hydrogel membranes (polyethylene glycol diacrylate) between channels via photo-induced cross-linking.
  • Characterization of membrane permeability to ions, small molecules, and biomolecules.
  • Application in magnetic tweezer experiments to measure RNA hairpin folding dynamics.

Main Results:

  • The device successfully allows solution equilibration through diffusion while preventing advection of molecules.
  • Permeable membranes effectively block larger biomolecules, preserving sample integrity.
  • The thin device design is compatible with high-resolution magnetic tweezer measurements.
  • Salt-dependent folding of a single RNA hairpin was successfully measured.

Conclusions:

  • The developed thin microfluidic device provides a non-perturbative method for controlling solution conditions in single-molecule experiments.
  • This technology enhances compatibility with advanced instrumentation like magnetic tweezers.
  • The device facilitates precise biomolecular studies by enabling controlled diffusion-based solution exchange.