4.7 Article

Microemulsion Delivery Systems with Low Surfactant Concentrations: Optimization of Structure and Properties by Glycol Cosurfactants

Journal

MOLECULAR PHARMACEUTICS
Volume 20, Issue 1, Pages 232-240

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.molpharmaceut.2c00599

Keywords

microemulsion; optimization; propylene glycol; pentylene glycol; low surfactant content

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This study assessed the use of two glycols and their mixtures in microemulsions and found that the composition and viscosity of microemulsions can be changed by quantifying glycols. The selected oils and glycols composition resulted in microemulsions with reduced surfactant content and improved safety as delivery systems.
Extensive use of microemulsions as delivery systems raises interest in the safe ingredients that can form such systems. Here, we assessed the use of two glycols, i.e., propylene glycol and pentylene glycol, and their mixtures to manipulate the properties and structure of microemulsions. Obtained systems with glycols were extensively characterized in terms of capacity to incorporate water phase, droplet size, polydispersity, structure type, and rheological and thermal properties. The results of these studies indicate that the composition, structure, and viscosity of the microemulsions can be changed by appropriate quantification of glycols. It has been shown that the type of glycol used and its amount may favor or worsen the formation of microemulsions with the selected oils. In addition, a properly selected composition of oils and glycols resulted in the formation of microemulsions with a reduced content of surfactants and consequently improved the safety of using microemulsions as delivery systems.

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