科研之友
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摘要
a chlorin compound, pheophorbide a ethyl ester and a mixture of sterols known as 汕-sitosterol and stigmasterol, were isolated from the petroleum ether extract of uncaria guianensis (rubiaceae) leaves. their structures were elucidated by detailed analysis of nmr spectra, including bidimensional techniques and by comparison with literature data. the antibacterial activity for the pheophorbide a ethyl ester was evaluated against two gram (+) strains: s. aureus atcc 6538 y e. faecalis atcc 29212 and three gram (-) strains: e. coli atcc 25922, s. typhimurium atcc 14028s y s. typhimurium ms7953s. aureus atcc 6538 and e. fecalis atcc 29212, finding significant activity against s. aureus 6538, e. faecalis 29212, s. tiphymurium ms7953 and e. coli 25922.
