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Release studies from lyotropic liquid crystal systems.

H G Ibrahim1

  • 1Faculty of Pharmacy, University of Jordan, Amman.

Journal of Pharmaceutical Sciences
|August 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study established a temperature-composition diagram for polyoxethylene (20) isohexadecyl ether and water, revealing anisotropic phases. Medium structure significantly impacts salicylic acid release rates across lipoidal barriers.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surfactant Science

Background:

  • Nonionic surfactants like polyoxethylene (20) isohexadecyl ether form complex phase behaviors with water.
  • Understanding these phase behaviors is crucial for controlled release applications.

Purpose of the Study:

  • To establish the temperature-composition diagram for polyoxethylene (20) isohexadecyl ether-water systems.
  • To investigate the release kinetics of salicylic acid from liquid crystalline phases.
  • To determine the influence of medium structure on interfacial resistance.

Main Methods:

  • Phase diagram construction through temperature and composition variation.
  • Salicylic acid release studies from various surfactant mesophases.
  • Kinetic analysis of transfer rates and activation energy determination.

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Main Results:

  • Three distinct anisotropic regions were identified within the 33-80% concentration range of the surfactant.
  • Salicylic acid release rates varied based on surfactant loading and molecular packing.
  • Apparent activation energies differed significantly between ordered (33.3 kcal/mol) and isotropic (9.4 kcal/mol) media.

Conclusions:

  • The structure of the surfactant-water medium profoundly affects the interfacial resistance of lipoidal barriers.
  • Ordered mesophases present higher resistance to solute transfer compared to isotropic phases.
  • These findings have implications for designing drug delivery systems utilizing surfactant-based liquid crystals.