Sistemas nanoestruturados obtidos a partir do óleo essencial de Citrus sinensis/água estabilizados por tensoativo : avaliação estrutural e potencial uso no controle larvicida do Aedes aegypti

• Autor(a) principal: Ferreira, Sarah Guerra
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: https://ri.ufs.br/handle/riufs/3929
• topic: Farmacologia; Aedes aegypti; Laranja; Frutas cítricas; Essencias e óleos essenciais; Óleos cítricos; Microemulsão; Cristais líquidos; Precursor de fase; Microemulsion; Liquid crystal; Liquid crystal precursor; CNPQ::CIENCIAS DA SAUDE::FARMACIA

Liquid crystalline precursors are surfactant systems that can contain active substances as Citrus sinensis essential oil (CSEO) with exhibits biological activity against Aedes aegypti (Ae. aegypti) larvae. These systems can undergo into phase transition in aqueous solution and become more structured aggregates. Thereby, the aim of this work was to obtain and characterize nanostructured systems through water/ oil stabilized by polyoxypropylene (5) polyoxyethylene (20) cetyl ether (procetyl AWS®, PPG-5 CETETH-20) surfactant to obtain a system that in contact with aqueous fluids becomes a high viscosity liquid crystal mesophase with potential application on Ae. aegypti larvicidal control. First, the phase diagram was constructed in order to obtain the systems, composed by water, PPG-5 CETETH-20: oleic acid (OA) 1:1 and 2:1 and CSEO. There was performed critical micelle determination of PPG-5 CETETH-20, PPG-5 CETETH-20: OA 1:1 and 2:1. The systems were evaluated by polarized light microscopy (PLM), small angle X-ray scattering (SAXS), rheology and lethal concentration evaluation against Ae. aegypti larvae. PPG-5 CETETH-20 has shown CMC= 0,2 g/ L, PPG-5 CETETH-20: OA 1:1 CMC= 0,077 g/ L and 2:1 CMC= 0,0578 g/ L, indicating that there is a synergism between the surfactant and cosurfactant for lowering the surface tension. In the phase diagram 2:1, there were observed four regions: liquid crystal (LC), emulsion, microemulsion (ME) and phase separation, however in the 1:1 phase diagram, the LC region wasn t observed. The microscopy distinguished isotropic systems like MEs from anisotropic as lamellae and hexagonal LCs. SAXS measurements confirmed PLM structures, with broad bands of low intensity for MEs (all samples from 1:1 and six samples from 2:1), phase transition and for lamellar LC structure, the positions of the peaks should obey the relationship 1:2:3 and 1:√3:√4 for hexagonal. The rheological analysis showed that ME and phase transitions ME-LC presents Newtonian behavior, while LC presents non-newtonian behavior and the increase of aqueous phase increases the LC elasticity modulus. The larvicidal activity the samples A3 (15% A/ 5% OECS/ 80% PPG-5 CETETH-20: AO) and A4 (20% A/ 5% OECS/ 75% PPG-5 CETETH-20: AO) of diagram 2:1 exhibited LC50 6,55 ppm and 5,93 pm, respectively, indicating that these systems microstructure has improved the oil solubility in aqueous medium. Thereby, it can be concluded that there were obtained liquid crystalline precursors with a potential use against Ae. aegypti larvae.