Aqueous Solutions of Oil-Soluble Polyglycerol Esters: Structuring and Emulsifying Abilities

Area of Science:

• Food science and technology
• Materials science
• Physical chemistry

Background:

• Polyglycerol esters (PGEs) are widely used emulsifiers in pharmaceuticals and cosmetics.
• Existing research primarily focuses on oil-soluble PGEs in oil phases, with limited data on aqueous systems.

Purpose of the Study:

• To investigate the structuring of oil-soluble PGEs in aqueous phases.
• To characterize their emulsifying abilities and the factors influencing these properties.

Main Methods:

• Rheological measurements to assess solution viscosity.
• Differential scanning calorimetry (DSC) to analyze thermal transitions.
• Microscopy observations to visualize structuring.

Main Results:

• Significant correlations were found between viscosity changes and DSC thermal peaks.
• Single-tail PGEs with more polyglycerol units formed more organized networks, leading to higher viscosity.
• Emulsion viscosity varied significantly based on emulsification temperature, demonstrating PGEs' tunable properties.

Conclusions:

• Oil-soluble PGEs exhibit distinct structuring behaviors in aqueous phases.
• PGE molecular structure and homogenization temperature are critical for controlling viscosity and emulsion properties.
• These findings enhance understanding of PGEs for broader industrial applications.