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Transparent macroemulsions for cosmetic applications
N Garti1, A Aserin, A Kopilovich
1Casali Institute of Applied Chemistry, School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel.
International Journal of Cosmetic Science
|May 23, 2009
Summary
This study developed transparent oil-in-water emulsions for cosmetics by matching refractive indices. The resulting transparent emulsions demonstrated good stability for cosmetic applications.
Area of Science:
- Cosmetic Science
- Colloid and Surface Chemistry
Background:
- Transparent emulsions are desirable for cosmetic formulations.
- Achieving transparency in macroemulsions requires careful control of formulation parameters.
Purpose of the Study:
- To develop a method for preparing stable, transparent oil-in-water emulsions for cosmetic use.
- To investigate the role of polyols and emulsifiers in achieving emulsion transparency and stability.
Main Methods:
- Formulating oil-in-water emulsions using isopropyl myristate as the oil phase and a mixture of water and polyols (sorbitol, glycerol, mannitol) as the continuous phase.
- Utilizing specific emulsifier combinations, including triethanolamine oleate, sorbitan esters, and ethoxylated sorbitan esters.
- Optimizing water concentration by spectrophotometer measurements at 660 nm to maximize transparency.
Main Results:
- Stable transparent macroemulsions were successfully prepared.
- Emulsion stability was enhanced by specific combinations of emulsifiers.
- Refractive index matching between oil and water phases was crucial for transparency.
Conclusions:
- Stable transparent macroemulsions can be achieved by matching the refractive indices of the oil and continuous phases.
- The developed method provides a viable approach for creating transparent cosmetic emulsions.
