Constituintes químicos e atividade farmacológica de Erythroxylum pulchrum St. Hil. (Erythroxylaceae)

• Ano de defesa: 2013
• Autor(a) principal: Albuquerque, Camila Holanda de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraí­ba; BR; Farmacologia; Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos; UFPB
• Palavras-chave em Português: Erythroxylum pulchrum; Constituintes químicos; Atividade antimicrobiana; Chemical constituents; Antimicrobial activity; CIENCIAS BIOLOGICAS::FARMACOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/6788

The natural products represent a rich source of bioactive compounds and are an example of molecular diversity, with a well-known potential on the discovery and development of new drugs. Erythroxylum pulchrum, (Erythroxylaceae) is an exclusive species from the brazilian flora, distributed on the northeast and southeast regions of the country; which can be found in Paraíba in a particular area of Pico do Jabre PB . A voucher specimen is deposited at the Professor Lauro Pires Xavier (JPB) herbarium with the code 4947. On this phytochemical study the dried powder of the aerial parts was submitted to an extraction with methanol, followed by partition. The ethyl acetate fraction was submitted to a Medium Pressure Liquid Chromatography. Therefore, it was possible to identify four flavonoids: epicatechin, quercetin-3-O-α-Lrhamnoside, ombuin-3-rutinosideand ombuin-3-rutinoside-5-glucoside. The hexanic fraction was also submitted to a Medium Pressure Liquid Chromatography which led to the identification of one terpenoid - lupeol and one steroid - β- sitosterol. These substances were identified by analysis of data obtained from spectroscopic methods such as infrared, mass spectrometry and NMR of 1H and 13C, with the aid of two dimensional techniques, besides comparison with literature data. It was also evaluated the antimicrobial activity from its crude extract against bacterial strains of clinical matter by measuring the minimum inhibitory concentration for each bacterial strain tested by the microdilution assay. So, the crude extract inhibited the growth of the following bacterial strains: Bacillus subtilis CCT 0516, Escherichia coli ATCC 2536, Pseudomonas aeruginosaA TCC 8027, Pseudomonas aeruginosa ATCC 25619, Staphylococcus aureusATCC 6538, Staphylococcus aureusATCC 25925, Streptococcus sanguíneos, Streptococcus salivares, Streptococcus mutansand Streptococcus ATCC. However, the genus Staphylococcus aureus ATCC 25925 was the most sensible, but on the other hand, the species Streptococcus sanguíneos e Streptococcus salivares was the most resistant against the antimicrobial effect of the crude extract. The results obtained on this research contributed to the phytochemical and pharmacology study of Erythroxylum pulchrum and to the chemotaxonomic knowledge of the genus Erythroxylum, as well as the Erythroxylaceae family.