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Related Experiment Videos

Oxidation-sensitive polymeric nanoparticles.

Annemie Rehor1, Jeffrey A Hubbell, Nicola Tirelli

  • 1Institute for Biomedical Engineering and Department of Materials, Swiss Federal Institute of Technology and University of Zurich, Moussonstrasse 18, CH-8044 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 29, 2004
PubMed
Summary

Researchers developed new cross-linked polysulfide nanoparticles for hydrophobic drugs. These stable, size-controlled nanoparticles show oxidative sensitivity, swelling and dissolving under specific conditions, with low cytotoxicity.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology
  • Drug Delivery

Background:

  • Organic polysulfides have shown potential for oxidation-sensitive colloidal carriers, particularly polymeric vesicles for hydrosoluble drugs.
  • A need exists for drug delivery systems capable of encapsulating hydrophobic molecules.

Purpose of the Study:

  • To develop novel cross-linked polysulfide nanoparticles for the delivery of hydrophobic drugs.
  • To investigate the characteristics of these nanoparticles, including size control, stability, and responsiveness to oxidative conditions.

Main Methods:

  • Utilized living emulsion polymerization of episulfides to synthesize cross-linked polysulfide nanoparticles.
  • Characterized nanoparticle size, functionality, and stability.

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  • Assessed cytotoxicity using a fibroblast model and evaluated responsiveness to oxidative environments.

    • Main Results:

    • Successfully produced stable polysulfide nanoparticles with good control over size and functionality.
    • Demonstrated negligible cytotoxicity on fibroblast cells.
    • Observed that nanoparticles swell and subsequently solubilize under oxidative conditions.

    Conclusions:

    • Cross-linked polysulfide nanoparticles are a viable platform for delivering hydrophobic drugs.
    • The developed nanoparticles offer tunable properties and controlled release mechanisms triggered by oxidation.
    • These findings open new avenues for designing advanced, responsive drug delivery systems.