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Controlled Nanoconfinement in a Microfluidic Modular Bead Array Device via Elastomeric Diaphragm Collapse for

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Summary

This study presents a novel nanoconfinement device that significantly accelerates biomolecular binding kinetics. This technology enhances receptor screening and selection based on binding affinities, improving drug discovery and diagnostics.

Keywords:
aptamersbinding affinitiesbinding kineticsdiaphragmsmicrofluidicsnanofluidics

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biophysics

Background:

  • Diffusional transport limitations hinder biomolecular binding kinetics.
  • Nanoscale confinement strategies can overcome these limitations.
  • Efficient receptor screening requires enhanced binding affinity measurements.

Purpose of the Study:

  • To develop a modular and multiplexed device for creating nanoconfinement.
  • To enhance receptor binding kinetics for improved screening and selection.
  • To validate the device's performance in accelerating biomolecular interactions.

Main Methods:

  • Utilized an elastomeric diaphragm collapsing onto microbead arrays for nanoconfinement.
  • Integrated a strain sensor for controlled vertical displacement and nanoposts for lateral extent control.
  • Employed repeated diaphragm withdrawal to promote bulk transport and enhance binding.
  • Enabled multiplexed screening in microwells and downstream quantification via quantitative PCR (q-PCR).

Main Results:

  • Demonstrated significantly enhanced biomolecular binding under nanoconfinement (1 Hz pressurization).
  • Achieved rapid DNA immobilization with a time constant of ~6 minutes compared to >60 minutes without confinement.
  • Showcased saturating binding of target molecules with optimal aptamers, reaching 88% site occupancy versus 5% without confinement.
  • Validated the screening of candidate receptors based on binding affinity parameters.

Conclusions:

  • The developed nanoconfinement device effectively accelerates biomolecular binding kinetics.
  • This platform facilitates efficient multiplexed screening and selection of receptors based on binding affinities.
  • The technology holds promise for applications in diagnostics and drug discovery.