Abstract
The Brazilian biodiversity offers a multiplicity of raw materials with great potential in cosmetics industry applications. Some vegetable oils and fatty esters increase skin hydration by occlusivity, keeping the skin hydrated and with a shiny appearance. Sunflower (Helianthus annus L.) oil is widely employed in cosmetic emulsions in the form of soaps, creams, moisturizers and skin cleansers due to the presence of polyphenols and its high vitamin E content. Liquid crystals are systems with many applications in both pharmaceutical and cosmetic formulations and are easily detected by microscopy under polarized light due to their birefringence properties. The aim of this research was to develop emulsions from natural sunflower oil for topical uses. Sunflower oil (75.0% w/w) was combined with liquid vaseline (25.0% w/w) employing a natural self-emulsifying base (SEB) derivative. The high temperature of the emulsification process did not influence the antioxidant properties of sunflower oil. Fatty esters were added to cosmetic formulations and extended stability tests were performed to characterize the emulsions. Fatty esters like cetyl palmitate and cetyl ester increase the formation of anisotropic structures. O/W emulsions showed acidic pH values and pseudoplastic behavior. The presence of a lamellar phase was observed after a period of 90 days under different storage conditions.
Highlights
Liquid crystals (LCs) are self-assembled dynamic functional soft materials which possess both order and mobility at the molecular, supramolecular and macroscopic levels
Liquid crystalline structures have received a good deal of attention in recent years
The liquid crystalline structures formed by amphiphilic molecules form the basis for emulsions and have been thoroughly studied by researchers in cosmetic product development
Summary
Liquid crystals (LCs) are self-assembled dynamic functional soft materials which possess both order and mobility at the molecular, supramolecular and macroscopic levels. The liquid crystalline structures formed by amphiphilic molecules form the basis for emulsions and have been thoroughly studied by researchers in cosmetic product development. Many cosmetic products like skin lotions and creams are based on water being the solvent and some of these products have in common the presence of liquid-crystalline phases which influence the rheological properties. In a more general sense, the combination of order and mobility, as exhibited by liquid crystals, is a basic requirement for self-organization and structure formation in living systems [1].
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