RESUMO
The roots of Cephalaria ambrosioides yielded a new triterpene, 6alpha-hydroxyhederagenic acid ( 1), in addition to the known triterpene hederagenic acid ( 2) and four corresponding saponins, leontoside A (or akeboside Stb) ( 3), kalopanax saponin A (or alpha-hederin) ( 4), saponin PG (or sapindoside B) ( 5), and dipsacoside B ( 6). Their structures have been elucidated on the basis of their spectral data (MS, 1 D and 2 D NMR) and by some chemical transformations. The extract and all isolated compounds were evaluated for their antimicrobial, molluscicidal and IN VITRO cytotoxic activities. All compounds showed strong antimicrobial activity (MIC values 1.80 - 2.50 microg/mL), with 5 and 6 exhibiting activities comparable to those of standard antibiotics. Moreover, compounds 3 - 5 were active against all assayed cancer cell lines, whereas compounds 3 and 4 exhibited higher activities against Biomphalaria Glabrata snails, with minimum inhibitory concentrations of 5.4 and 6.2 microg/mL, respectively.
Assuntos
Anti-Infecciosos/farmacologia , Citotoxinas/farmacologia , Dipsacaceae/química , Praguicidas/farmacologia , Extratos Vegetais/farmacologia , Triterpenos/farmacologia , Animais , Anti-Infecciosos/química , Anti-Infecciosos/isolamento & purificação , Linhagem Celular Tumoral , Citotoxinas/química , Citotoxinas/isolamento & purificação , Humanos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Controle de Pragas/métodos , Praguicidas/química , Praguicidas/isolamento & purificação , Extratos Vegetais/química , Extratos Vegetais/isolamento & purificação , Raízes de Plantas , Caramujos , Triterpenos/química , Triterpenos/isolamento & purificaçãoRESUMO
A new lignan glycoside, 1,5-dihydroxy-2-(4"-beta-D-glucopyranosyloxy-3"-methoxyphenyl)-6-(4'-hydroxy-3'-methoxyphenyl)-3,7-dioxabicyclo[3.3.0]octane, named ambrosidine ([structure: see text]), along with seven known compounds (four iridoids and three hydroxycinnamic esters) were isolated from the roots of Cephalaria ambrosioides. The structures of these compounds were determined by use of NMR and MS techniques and by chemical transformations. The cytotoxic activity of the novel compound [structure: see text] was evaluated against five human solid tumour cell lines.
