ABSTRACT
ABSTRACTThe antimicrobial activity of the myrsinoic acid A isolated from Myrsine coriacea (Sw.) R.Br. ex Roem. & Schult., Primulaceae, and a two semi-synthetics derivatives was tested against Bacillus subtilis, Escherichia coli, Salmonella enterica subsp. enterica serovar typhi, Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa, Micrococcus luteus, Candida albicans, Candida krusei and Candida tropicalis. The microdilution method was used for the determination of the minimum inhibitory concentration during evaluation of the antimicrobial activity. The myrsinoic acid A showed no activity against the selected microorganisms but the hydrogenated and acetylated derivatives were active against B. subtilis, E. coli, S. aureus and P. aeruginosa.
ABSTRACT
Do extrato diclorometano do caule de Almeidea coerulea (Nees & Mart.) A. St.-Hil. foi isolado um triterpeno o 20-hidroxi-diidrolupeol (1), e do extrato metanólico foram isolados os alcalóides dictamina (2) e eskimianina (3), além de uma mistura dos esteróides sitosterol (4) e estigmasterol (5). A identificção substâncias foi realizada pela análise dos espectros de Massas, RMN ¹H, RMN 13C, HSQC, HMBC, e por comparação com dados da literatura.
From the dichloromethane extract of Almeidea coerulea stem one triterpene, 20-hydroxy-dihydrolupeol was isolated (1) and from the methanol extract the known alkaloids dictamnine (2) and skimmianine (3), as well the steroids sitosterol (4) and stigmasterol (5). The identification of these compounds was performed on the basis of spectroscopic analyses (MS, ¹H NMR, 13C NMR, HSQC and HMBC) as well as comparison with literature data.
ABSTRACT
The in vitro trypanocidal activity of 22 extracts and 43 fractions of plants belonging to the families Meliaceae and Rutaceae was evaluated. The extracts from leaves of Conchocarphus heterophyllus and branches of Trichilia ramalhoi were the most active. The trypanocidal activity seems to be increased by fractionation of the extracts. Fractions from C. heterophyllus and Galipea carinata were the most active and a 100 percent lysis of the parasites was observed for five fractions. From one of them were isolated two flavonoids: flavone and 7-methoxyflavone, which showed weak trypanocidal activity. The results obtained from the extracts and fractions revealed that the order Rutales is a promising source for the search of new drugs for Chagas disease. Phytochemical studies with the other active fractions are underway in order to isolate compounds, which could be associated with observed activities.