Estudo físico-químico e biológico dos compostos [H2(TDFSPP)] e [Zn(TDFSPP)] visando aplicação em terapia fotodinâmica (TFD)

• Autor(a) principal: Balzer, Rosana
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UEPG
• Texto Completo: http://tede2.uepg.br/jspui/handle/prefix/2087
• topic: terapia fotodinâmica; compostos porfirínicos; micro-organismos; photodynamic therapy; porphyrin compounds; microorganisms; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA

The properties of compounds 5, 10, 15, 20-tetrakis (2,6 difluor-5-sulfonatophenyl) sodium porphyrin, Na4[H2(TDFSPP)], and 5, 10, 15, 20-tetrakis (2,6 difluor-5-sulfonatophenyl) sodium porphyrinate zinc (II), Na4[Zn(TDFSPP)], were investigated with the objective of using them as photosensitizers in Photodynamic Therapy (PDT). LED systems were used at different emission bands, orange, green and red for irradiation of samples. Photobleaching reactions were studied through the molecular absorption analysis UV-Visible, irradiating samples with LED systems for one hour. It was observed that compounds are photostable. Oxygen singlet generation was analyzed through the uric acid test, and it was observed that the compounds generated oxygen singlet. Zinc porphyrin presented higher efficiency in the generation of the reactive species. Aggregation at different proportions of the water/ethanol system was evaluated with UV-Visible techniques and fluorescence emission. Results indicated that there was no formation of aggregates for the compounds in the conditions analyzed. The photodynamic action of compounds was analyzed through in vitro analysis with brine shrimp Artemia salina and the microorganisms Candida albicans, Escherichia coli e Staphylococcus aureus. Through the analysis of results obtained in tests with Artemia salina, it was concluded that for both compounds and for the three LED systems, the highest percentage of death occurred in tests with association of compound and irradiation, which indicates photodynamic activity in the systems employed. Results obtained in the tests to evaluate photodynamic activity of compounds for inactivation of microorganisms revealed that lighting time did not influence the number of colony forming units (UFC). The lowest UFC values were observed for the systems with association of compounds and light, that is, there was photodynamic activity. Thus, results demonstrated that the compounds present potential to be used in Photodynamic Therapy.