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Exosomes trapping, manipulation and size-based separation using opto-thermo-electrohydrodynamic tweezers.

Chuchuan Hong1,2, Sen Yang1,2, Justus C Ndukaife1,2,3

  • 1Electrical and Computer Engineering Department, Vanderbilt University Nashville TN 37212 USA justus.ndukaife@vanderbilt.edu.

Nanoscale Advances
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Summary

Researchers developed a novel opto-thermo-electrohydrodynamic tweezer for stable single exosome trapping. This method uses low laser power to manipulate exosomes by size without causing photo-induced damage.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biophysics

Background:

  • Exosomes are heterogeneous in size and composition, necessitating advanced methods for single exosome analysis.
  • Conventional optical tweezers face challenges in stably trapping exosomes due to their small size and low refractive index, requiring high laser power that can cause photo-induced damage.

Purpose of the Study:

  • To develop a stable and efficient method for trapping, manipulating, and sorting single exosomes in solution.
  • To overcome the limitations of existing optical trapping techniques for exosomes, specifically photo-induced damage and high power requirements.

Main Methods:

  • A concentric nanohole array (CNA) system was employed, integrating laser illumination and an alternating current (a.c.) field.
  • The CNA generates electrohydrodynamic potentials for stable stand-off trapping of single exosomes away from the laser focus.
  • Opto-thermo-electrohydrodynamic principles were utilized for trapping and manipulation.

Main Results:

  • Achieved stable trapping of single exosomes within seconds using significantly reduced input laser power (4.2 mW).
  • Demonstrated selective dynamic manipulation of exosomes based on their size.
  • The trapping occurred in regions of electrohydrodynamic potential, several microns from the laser focus, mitigating direct laser exposure.

Conclusions:

  • The proposed opto-thermo-electrohydrodynamic tweezer platform offers a promising approach for stabilizing single exosomes in solution.
  • Enables controlled distribution of exosomes based on size without the risk of photo-induced damage.
  • This technique advances exosome research by providing a non-damaging method for single exosome manipulation and analysis.