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Poly(lactic-co-glycolic acid) as a particulate emulsifier.

Catherine P Whitby1, Li Hui Lim, Nasrin Ghouchi Eskandar

  • 1Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia, Australia. catherine.whitby@unisa.edu.au

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Poly(lactic-co-glycolic acid) nanoparticles stabilize oil-in-water emulsions by adsorbing to oil droplet surfaces. Their concentration controls emulsion size and stability, offering insights into Pickering emulsion mechanisms.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Biomaterials Science

Background:

  • Emulsion stability is crucial in many industries.
  • Nanoparticles offer unique properties for emulsion stabilization.
  • Poly(lactic-co-glycolic acid) (PLGA) is a biocompatible polymer with potential applications in Pickering emulsions.

Purpose of the Study:

  • To characterize the structure and stability of emulsions stabilized by PLGA nanoparticles.
  • To investigate the role of PLGA nanoparticle surface properties in emulsion formation.
  • To elucidate the mechanism by which PLGA nanoparticles stabilize Pickering emulsions.

Main Methods:

  • Measurement of oil-water contact angles on PLGA films.
  • Preparation and characterization of oil-in-water emulsions with varying PLGA nanoparticle concentrations.
  • Electron microscopy for visualization of nanoparticle location at the oil-water interface.
  • Assessment of emulsion droplet size and coalescence stability.

Main Results:

  • PLGA nanoparticle surface hydrophobicity correlates with oil phase polarity.
  • Polyvinyl alcohol modification of PLGA surfaces enhances oil-in-water emulsion stabilization.
  • PLGA nanoparticles effectively stabilize emulsions across a range of oil polarities.
  • Nanoparticle concentration is a critical factor influencing emulsion droplet size and stability.
  • Electron microscopy confirmed PLGA nanoparticles reside at the droplet interface, characteristic of Pickering stabilization.

Conclusions:

  • PLGA nanoparticles can act as effective stabilizers for Pickering emulsions.
  • Surface modification of PLGA nanoparticles can tune their emulsifying properties.
  • Understanding the interplay between nanoparticle properties and oil polarity is key to designing stable emulsions.
  • These findings contribute to the mechanistic understanding of nanoparticle-stabilized emulsions.