Phase Behavior of Polyglycerol Ester-Based Nanoemulsions

Area of Science:

• Colloid and Surface Chemistry
• Formulation Science

Background:

• Nanoemulsions offer enhanced delivery and stability.
• Polyglycerol esters are versatile emulsifiers with tunable properties.

Purpose of the Study:

• To investigate the phase behavior of nanoemulsions using polyglycerol esters.
• To determine the impact of emulsifier type, oil selection, and polyols on nanoemulsion formation and stability.

Main Methods:

• Preparation of nanoemulsions utilizing polyglycerol esters as emulsifiers.
• Analysis of phase diagrams to map nanoemulsion regions.
• Systematic variation of emulsifiers, oils (caprylic acid capric triglyceride, mineral oil, squalane), and polyols (jojoba ester, glycerin).

Main Results:

• Hydrophilic polyglyceryl-4 laurate favored translucent nanoemulsions.
• Lipophilic polyglyceryl-4 oleate enhanced emulsification performance.
• Caprylic acid capric triglyceride as oil promoted translucent nanoemulsions, unlike mineral oil or squalane.
• Jojoba ester and glycerin addition improved oil-in-water (O/W) emulsion formation and stability.

Conclusions:

• Emulsifier hydrophilicity/lipophilicity and oil type significantly influence nanoemulsion phase behavior.
• Glycerin enhances aqueous phase polarity, improving emulsifier-surfactant interaction for translucent nanoemulsions.
• Optimized formulation using specific polyglycerol esters and oils can yield stable, translucent O/W nanoemulsions.