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Cationic Polyelectrolyte Adsorption onto Anionic Nanoparticles Analyzed with Frequency-Domain Scanning Fluorescence

Lucas Oorlynck1, Lenny Van Daele2, Alina Myslovska3

  • 1Department of Electronics and Information Systems, Ghent University, Tech Lane Ghent Science Park - Campus A 126, Ghent, 9052, Belgium.

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Summary
This summary is machine-generated.

A new small-circle scanning fluorescence correlation spectroscopy (sFCS) method enhances polymer-particle analysis. This technique efficiently measures polymer adsorption and stability on nanoparticles without volume calibration.

Keywords:
fluorescence correlation spectroscopynanoparticle agglomerationnanoparticlespolyelectrolyte adsorptionscanning microscopy

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Fluorescence Correlation Spectroscopy (FCS) is a powerful tool for analyzing molecular dynamics.
  • Standard FCS requires precise calibration of the measurement volume, which can be time-consuming.
  • Investigating polymer adsorption on nanoparticles is crucial for applications in biomedicine and gene delivery.

Purpose of the Study:

  • To introduce an improved small-circle scanning fluorescence correlation spectroscopy (sFCS) technique.
  • To validate the enhanced sFCS method using simulations and experimental data.
  • To investigate polymer adsorption on nanoparticles for biomedical applications.

Main Methods:

  • Combined acousto-optical laser scanning with frequency-domain fitting of the autocorrelation function.
  • Validated the technique on polystyrene beads, quantum dots, and lipid nanoparticles.
  • Applied sFCS to study poly(2-guanidinoethyl methacrylate) (PGUMA) polymer adsorption on polystyrene beads.

Main Results:

  • The improved sFCS technique accurately determined particle diffusion and illumination beam waist.
  • Identified polymer concentration ranges for stable polymer-particle complexes.
  • Observed an increase in hydrodynamic size correlated with adsorbed polymer molecular mass.

Conclusions:

  • The developed sFCS method provides an efficient and accurate way to study polymer-particle interactions.
  • The technique offers advantages over standard FCS by eliminating the need for measurement volume calibration.
  • This advancement is valuable for optimizing polymer-coated particles in biomedical and gene delivery systems.