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Related Experiment Videos

Characterizing submicron vesicles with wavelength-resolved fluorescence in flow cytometry

R R Fuller1, J V Sweedler

  • 1Department of Chemistry and Beckman Institute, University of Illinois, Urbana, USA.

Cytometry
|October 1, 1996
PubMed
Summary

This study introduces a novel method for precisely sizing individual synthetic vesicles using single-particle fluorescence. The technique accurately measures vesicle size, crucial for nanoparticle analysis and characterization.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Accurate sizing of synthetic vesicles is critical for understanding their properties and applications.
  • Traditional methods may lack the resolution or throughput for detailed vesicle analysis.

Purpose of the Study:

  • To develop and validate a novel method for sizing individual synthetic vesicles.
  • To enable high-resolution analysis of submicron vesicle populations.

Main Methods:

  • Utilized single-particle fluorescence emission spectra from a custom sheath flow cell.
  • Employed an imaging spectrograph and charge-coupled device for data acquisition at 1 Hz.
  • Analyzed vesicles prepared with phosphatidylserine and fluorescently labeled lipids.

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Main Results:

  • Achieved limits of detection below 1.0 x 10^4 molecules for common fluorophores.
  • Successfully identified, sized, and discriminated individual submicron vesicles based on their spectra.
  • Demonstrated excellent agreement between fluorescence sizing and transmission electron microscopy measurements.

Conclusions:

  • The developed fluorescence-based method provides accurate and reliable sizing of individual synthetic vesicles.
  • This technique offers a powerful tool for small-particle population analysis.
  • The findings support the use of this method for detailed characterization of nanovesicles.