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Vesicles from docosahexaenoic acid.

Trishool Namani1, Takashi Ishikawa, Kenichi Morigaki

  • 1Department of Materials, ETH, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland.

Colloids and Surfaces. B, Biointerfaces
|July 11, 2006
PubMed
Summary
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Docosahexaenoic acid (DHA) forms stable vesicles in water under specific pH conditions. These DHA vesicles can encapsulate water-soluble molecules, suggesting potential applications in medicine and food.

Area of Science:

  • Biochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Docosahexaenoic acid (DHA) is an omega-3 fatty acid with unique self-assembly properties.
  • Vesicle formation is crucial for drug delivery and encapsulation applications.

Purpose of the Study:

  • To investigate the self-assembly of cis-4,7,10,13,16,19-docosahexaenoic acid (DHA) into vesicles.
  • To determine the optimal conditions for forming stable DHA vesicles.
  • To explore the encapsulation capabilities of DHA vesicles.

Main Methods:

  • Preparation of DHA vesicles in aqueous solution at controlled pH.
  • Utilizing polycarbonate membrane extrusion for vesicle formation.
  • Employing cryo-transmission electron microscopy (cryo-TEM) for structural analysis.

Related Experiment Videos

  • Assessing encapsulation efficiency using calcein as a fluorescent marker.

    • Main Results:

    • DHA self-assembles into vesicles when the molar ratio of neutral to anionic DHA is between 1:1 and 1:3 (pH 8.5-9.2).
    • Stable, unilamellar DHA vesicles (80 nm diameter) were prepared at pH 8.8 via membrane extrusion.
    • Cryo-TEM revealed DHA bilayers with high conformational flexibility, thinner than expected for extended molecules.
    • DHA vesicle bilayers exhibit similar thickness to oleic acid vesicles.
    • Successful encapsulation of water-soluble molecules (calcein) was demonstrated.

    Conclusions:

    • DHA can form stable, unilamellar vesicles with tunable properties.
    • The conformational flexibility of DHA within bilayers is a key feature.
    • DHA vesicles show promise for encapsulating water-soluble compounds for potential medical and food applications.