AVALIAÇÃO MICROBIOLÓGICA E CARACTERIZAÇÃO DE SUSPENSÕES CONTENDO NANOCÁPSULAS DE SULFADIAZINA DE PRATA

• Autor(a) principal: Agarrayúa, Danielle Araujo
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional Universidade Franciscana
• Texto Completo: http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/481
• topic: Sulfadiazina de prata, nanocápsulas, validação metodológica, ensaio microbiológico; Silver Sulfadiazine, nanocapsule, methodological validation, microbiological assay; Biociências e Nanomateriais

Silver sulfadiazine (SDAg), the drug of choice for topical treatment of infected burns, possesses a broad spectrum of action and the incidence of resistance is considerably lower than with most antibiotics. In the presence of water SDAg undergoes a partial hydrolysis with formation of free sulfadiazine and silver, which has been previously shown to be photoreactive. This work presents as main objective evaluated the microbiological activity of SDAg associated with nanocapsules prepared from poly( -caprolactone), using capric and caprylic acid triglycerides and butyleneglicol cocoate as oily phase. The suspensions were prepared by interfacial deposition of pre-formed polymer and were characterized in term of SDAg contents, associated drug within the nanoparticles, pH, mean size of particles and zeta potentials of nanocapsules with SDAg, and evaluated the influence of the types of oils (capric and caprylic acid triglycerides and butyleneglicol cocoato) on nanocapsules physico-chemical caracterization. The microbial activity of SDAg nanocapsules were analyzed against microorganism Pseudomonas aeruginosa (ATCC 27853) by the method of agar diffusion. The dosage technique of SDAg in HPLC was validated in all analyzed parameters and the results obtained met the specifications for linearity, precision, and accuracy. The suspension containing capric and caprylic acid triglycerides presented average size of 225 nm (±1,71), zeta potential of – 26 mV (±1,09) and pH values of 5,6. This sample showed an 100 % of drug entrapment. The values size particle of the suspension containing butyleneglicol cocoato was 221,4 nm (±2,3), zeta potential of – 27,9 mV (±1,7) and pH 5,7. Suspension with miglyol® SDAg contents were 77 % and 97,96%, determined by HPLC and microbiological assay, respectively, being higher when compared with suspension butyleneglicol cocoato, 38,5 % e 87,26 % demonstrating that the extraction of SDAg used is more efficient for the nanocapsules suspension with capric and caprylic acid triglycerides as oil core. Through the results, it is possible to conclude that the silver sulfadiazine nanocapsule suspensions are an alternative for the corporation in topical formulations.