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Attainment of O/W Emulsions Containing Liquid Crystal from Annatto Oil ( Bixa orellana ), Coffee Oil, and Tea Tree Oil ( Melaleuca alternifolia ) as Oily Phase Using HLB System and Ternary Phase Diagram

2008; Taylor & Francis; Volume: 29; Issue: 2 Linguagem: Inglês

10.1080/01932690701688581

1532-2351

Gilsane G. Morais, Orlando David Henrique dos Santos, Wanderley P. Oliveira, Pedro A. Rocha Filho,

Surfactants and Colloidal Systems

Emulsions containing liquid crystals present interesting properties and advantages such as the skin moisturize increase, active release modulation, and emulsion stabilization. In this work, emulsions containing annatto, coffee and tea tree oils, and nonionic surfactants were developed. The HLB method was used for selection of surfactants. The required HLB value was established (9.0). Liquid crystals were attained when used the surfactant mixture Ceteareth‐5 and Steareth‐2 and identified as lamellar. The emulsions showed pseudoplastic behavior and tixotropy. The ternary diagram was useful in the selection of the proportion of surfactant and oily phase considering skin compatibility and liquid crystal presence. Keywords: Liquid crystalvegetable oilsO/W emulsionHLB systemrheology This work was supported by grants from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and Capes (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior). The authors thank Beraca Sabará Ingredients, Croda ‐ Brasil, Chemyunion Química Ltda, and Oxiteno for supplying the raw materials.