It was found that the formation of a stable polyol-in-oil (P/O) emulsion was first the key to the preparation of P/O/W multiple emulsions. In our previous study, polyol-in-oil-in-water (P/O/W) multiple emulsions were first developed in which the internal water phase was replaced by a polyol phase and this was used to encapsulate vitamin C.

encapsulated the skin-lightening agent deoxyarbutin in a non-aqueous emulsified structure using polyol in silicone oil, which effectively improved the coating rate and stability of the agent. Their alcohol-oil emulsification system attracted considerable attention. Hamill and Petersen first prepared olive oil/polyol emulsions in the 1960s and proposed the concept of “non-aqueous emulsification”. In addition, the multiple hydroxyl groups in polyols can form hydrogen bonds, for example hydroxyl, phenol hydroxyl and ketone groups in the functional ingredients, which improves the solubility of the ingredient to some extent. Polyols are common non-aqueous polar solvents which can form hydrogen bonds and have relatively high dielectric constants. Therefore, the preparation of suitable formulations is urgently needed to modify the physical and chemical properties of such water/oil insoluble active ingredients and improve their stability and solubility.įor those functional ingredients which are difficult to dissolve in oil and water, polyols are potential media to solve such dissolution limitations. Although there are many types of functional raw materials in cosmetics, most of them, which have good antioxidant, anti-radical, whitening and other functions, such as flavonoids, terpenes, polyphenols, etc., are difficult to dissolve in the media of oil and water commonly used in cosmetics, which limits the realization of efficacy. The production of effective functional cosmetics depends on the properties of their functional ingredients, but is limited by the concentration of ingredients achievable in the application system. The expansion of the cosmetics market has prompted researchers to develop new functional cosmetic products that are highly effective and safe to use.

Water in oil emulsion stability