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Motility of Single Molecules and Clusters of Bi-Directional Kinesin-5 Cin8 Purified from S. cerevisiae Cells
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Electrokinetic Active Particles for Motion-Based Biomolecule Detection.

Cooper P Thome1, Wren S Hoertdoerfer1, Julia R Bendorf1

  • 1Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80303, United States.

Nano Letters
|March 7, 2023
PubMed
Summary
This summary is machine-generated.

We developed a label-free detection system using active particles to measure biomolecules. This method simplifies assays by directly linking particle motion to concentration, enabling rapid and accurate diagnostics.

Keywords:
Induced-charge electrophoresisactive particlesbiomolecule detectionbiosensinglabel-freemicromotors

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Biosensing

Background:

  • Biomolecule detection is crucial for diagnostics and disease management.
  • Active particle-based assays offer advantages like reduced sample volume and assay time.
  • Current methods often require secondary labeling, complicating workflows.

Purpose of the Study:

  • To demonstrate a proof-of-concept for a label-free, motion-based biomolecule detection system.
  • To utilize electrokinetic active particles for signal transduction.
  • To establish a foundation for simplified and rapid biomolecule detection.

Main Methods:

  • Preparation of induced-charge electrophoretic microsensors (ICEMs).
  • Utilizing ICEMs for the specific capture of model biomolecules (streptavidin and ovalbumin).
  • Measuring the change in ICEM speed as a direct signal output.

Main Results:

  • Specific capture of biomolecules was achieved using ICEMs.
  • Biomolecule capture resulted in direct signal transduction via ICEM speed suppression.
  • Detection was successful at concentrations as low as 0.1 nM.

Conclusions:

  • A novel label-free, motion-based biomolecule detection system using electrokinetic active particles was established.
  • This approach offers a simplified and rapid method for biomolecule detection.
  • The findings pave the way for a new generation of active particle-based diagnostic tools.