Liquid Crystal Formation from Sunflower Oil: Long Term Stability Studies

Autor(es)

da Rocha-Filho, Pedro Alves ^[1] ; Maruno, Monica ^[2] ; Ferrari, Marcio ^[3] ; Topan, Jose Fernando ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Pharmaceut Sci, Fac Pharmaceut Sci Ribeirao Preto, Ave Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil

^[2] Ctr Univ Barao de Maua, R Ramos de Azevedo 423, BR-14090180 Ribeirao Preto, SP - Brazil

^[3] Univ Fed Rio Grande do Norte, Coll Pharm, Rua Gustavo Cordeiro de Farias S-N, BR-59012570 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Molecules; v. 21, n. 6 JUN 2016.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 09/04584-1 - Desenvolvimento e avaliação de emulsões contendo cristais líquidos à base de óleo de girassol: estudo da influência da adição de diferentes ésteres
• Beneficiário: José Fernando Topan
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 09/07817-7 - Sistemas dispersos usados em tecnologia de cosméticos
• Beneficiário: Pedro Alves da Rocha Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular