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Related Concept Videos

Micelles01:30

Micelles

364
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
364

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Phase behavior of reverse microemulsions based on Peceol(®).

Abdelkader Mouri1, Olivier Diat2, Abdeslam El Ghzaoui3

  • 1Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-ENSCM-UM2-UM1, Equipe MACS, 8 rue de l'Ecole Normale, 34296 Montpellier, France; Medesis Pharma, Avenue du Golf, L'Orée des Mas, Les Cyprès, 34670 Baillargues, France.

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|December 28, 2013
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Summary
This summary is machine-generated.

This study maps the phase behavior of a Peceol®/lecithin/ethanol/water system, revealing microemulsion, liquid, and liquid crystalline phases. Increased water content drives structural transitions from isotropic microemulsions to inverted hexagonal and lamellar liquid crystalline phases.

Keywords:
MicroemulsionPhase diagramPhase transitionsPolar lipidsRheologySAXS

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Colloid and Surface Science

Background:

  • Understanding phase behavior is crucial for developing stable formulations.
  • Lecithin and ethanol are common excipients used to modify the properties of lipid-based systems.
  • Long-chain glycerides form the basis of many microemulsion systems.

Purpose of the Study:

  • To investigate the phase diagram of a four-component system: Peceol®/lecithin/ethanol/water at 25°C.
  • To explore the influence of water content on the structural transitions within the phase diagram.
  • To characterize the formation and evolution of microemulsion and liquid crystalline phases.

Main Methods:

  • Phase diagram determination at 25°C with a fixed ethanol fraction.
  • Investigation of structural transitions using conductivity, rheology, Karl Fisher titration, optical microscopy, and small-angle X-ray scattering (SAXS).
  • Analysis of microstructural changes as a function of water content.

Main Results:

  • The system exhibits an isotropic water-in-oil (W/O) microemulsion phase, a biphasic liquid system, and liquid crystalline phases.
  • Lecithin stabilizes the microemulsion, while ethanol fluidifies it, enabling high water solubilization.
  • Structural transitions observed with increasing water content: isotropic phase (L2) → inverted hexagonal phase (H2) → coexistence of inverted hexagonal (H2) and lamellar (Lα) phases.

Conclusions:

  • The combination of lecithin and ethanol effectively solubilizes large amounts of water in a microemulsion.
  • In the water-rich region, ethanol migration promotes the formation of liquid crystalline phases.
  • The study elucidates the sequence of structural transformations in this complex multi-component system.