Estudo fitoquímico e atividade biológica de duas espécies do semi-árido paraibano: Pithecoseris pacourinoides Mart. (Asteraceae) e Solanum rhytidoandrum Sendtn. (Solanaceae)

• Autor(a) principal: Gomes, Isis Fernandes
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/tede/6697
• topic: Pithecoseris pacourinoides Mart; Solanum rhytidoandrum Sendth; Flavonóides; Glicoalcalóide; Antitumoral; Pithecoseris pacourinoides Mart.; Solanum rhytidoandrum Sendth; Flavonoids; Glycoalkaloid; Anti-tumor; CIENCIAS BIOLOGICAS::FARMACOLOGIA

The Asteraceae family has cosmopolitan distribution, including about 1.100 genus and about 25.000 species. Chemical and pharmacological studies are not yet known in the genus Pithecoseris. The family Solanaceae A. Juss. has a worldwide distribution, including about 150 genus and approximately 3000 species. The genus Solanum comprises about 1000 species. Many species of Solanum are known as "jurubeba", a word that comes from the Tupi-Guarani yu'beba, which is associated with the presence of thorns and is used in folk medicine for various purposes. This paper describes the isolation, structural identification and biological activities of some chemical constituents of the flowers of Pithecoseris pacourinoides Mart. (Asteraceae) and roots of Solanum rhytidoandrum Sendtn. (Solanaceae), with the objective of contributing to the knowledge chemotaxonomic of the genera Pithecoseris and Solanum, as well as families Asteraceae and Solanaceae. The chemical constituents were identified by analysis of data obtained by spectroscopic methods as Infrared, 1H and 13C Nuclear Magnetic Resonance, with the add of two-dimensional techniques, Mass spectroscopy, and compared with values from the literature. Phytochemical study of the ethyl acetate phase of Pithecoseris pacourinoides Mart. resulted in the isolation of the steroids Sitosterol-3-O-b-D-glucopyranoside and Stigmasterol-3-O-b- D-glucopyranoside and flavonoids 5,7,4'-trihydroxyflavone, 3-O-methylquercetin and quercetin 3-O-α-L-rhamnoside, all first reported in the genus. Phytochemical study of the roots of Solanum rhytidoandrum Sendtn. resulted in the isolation of an alkaloid steroidal glycoside called xilosilsolamargina, first time reported in the species. The phases and extracts Pithecoseris pacourinoides Mart. were subjected to a bioassay with Artemia salina Leach which provided a direction for studies in search of new biologically active molecules in the other phases. The 3-O-methylquercetin and xilosilsolamargina were subjected to cytotoxicity assay against K562 line leukemia cell demonstrating that the analyzed constituents have excellent antitumor activity in vitro, concentration-dependent manner. The isolation of metabolites in species Pithecoseris pacourinoides Mart. and Solanum rhytidoandrum Sendtn. associated with biological assays showed a high potential of the study.