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Related Experiment Videos

Polymer-induced structural changes in lecithin/sodium dodecyl sulfate-based multilamellar vesicles.

Daniela Robertson1, Thomas Hellweg, Brigitte Tiersch

  • 1Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, Haus 25, 14476 Golm, Germany.

Journal of Colloid and Interface Science
|December 25, 2003
PubMed
Summary

Soybean asolectin forms multilamellar vesicles, but adding sodium dodecyl sulfate (SDS) disrupts them. Poly(diallyldimethylammonium chloride) (PDADMAC) addition restores vesicle formation, creating thermosensitive systems for drug delivery.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Biophysics

Background:

  • Aqueous lecithin mixtures, like soybean asolectin, exhibit lamellar liquid crystalline behavior forming multilamellar vesicles.
  • Incorporation of anionic surfactants, such as sodium dodecyl sulfate (SDS), disrupts these structures and reduces viscosity.

Purpose of the Study:

  • To investigate the effect of poly(diallyldimethylammonium chloride) (PDADMAC) on lecithin/SDS mixtures.
  • To explore the potential of polymer-modified vesicles as thermosensitive drug delivery systems.

Main Methods:

  • Preparation of aqueous mixtures of soybean asolectin, SDS, and PDADMAC.
  • Rheological measurements to assess viscosity changes.
  • Characterization of phase behavior and vesicle formation.

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Main Results:

  • Addition of SDS to asolectin disrupts multilamellar vesicles and decreases viscosity.
  • Addition of PDADMAC to lecithin/SDS systems re-induces multilamellar vesicle formation and increases viscosity.
  • Polymer-modified systems exhibit a temperature-dependent phase transition from compact vesicles to a swollen liquid crystalline phase.

Conclusions:

  • Polymer-surfactant interactions can restore and stabilize complex supramolecular structures in lecithin mixtures.
  • The observed thermosensitive phase transition highlights the potential of these polymer-modified multilamellar vesicles for controlled drug release applications.