Óleos voláteis obtidos das partes aéreas de plantas de três espécies de Mikania foram analisados por CG-EM e RMN. Quarenta e seis terpenos, entre monoterpenos, sesquiterpenos e diterpenos, foram identificados. A análise classificou Mikania hookeriana como produtora de diterpenos, de acordo com a maioria das espécies de Mikania que ocorrem no Brasil.
Volatile oils obtained from the aerial parts of three Mikania species plants were analyzed by GC-MS and NMR. Forty-six terpenes among monoterpenes, sesquiterpenes and diterpenes were identified by this methodology. The analysis classified Mikania hookriana as diterpene producer as the majority Mikania species occurring in Brazil.
This work describes the phytochemical study of hexane extracts from the stem of Maprounea guianensis. Besides 3-oxo-21alpha-H-hop-22(29)-en (moretenone), beta-sitosterol, lupenone and lupeol, a mixture of dodecosyl, tetracosyl, hexacosyl, octacosyl and triacontyl ferulates was also isolated, as well as 3-beta-acetoxy-lup-20(29)-en-28-oic acid, 3beta-O-trans-p-coumaroyl-lup-20(29)-en-28-oic acid and 3beta-O-trans-p-coumaroyl-urs-12-en-28-oic acid. The structures of these compounds were established by spectroscopic analysis.
Stigmaphyllom paralias is a herb belonging to the family Malpighiaceae that occurs in sand soil of brazilian " restinga". This is the first report regarding phytochemical study with this species. The hexane extract of the aerial parts of plant afforded the triterpenes friedelin, lupenone, 3-oxo-alpha-amirin and 3-oxo-beta-amirin, the mixture of alpha-amirinyl palmitate and stearate, lupeol and 3,4-seco-friedelan-3-oic acid. The AcOEt extract yielded the flavonoid luteolin-7-rutinoside. All compounds were characterized by analysis of spectrometric data and the fatty acids esterified with alpha-amirine were identified by GC/MS of methyl derivatives of transesterified products . This is the first natural occurence of 3,4-seco-friedelan-3-oic acid and the 13C NMR spectral data were inequivocally assigned by two-dimensional techniques. This work also permitted to correct the 13C NMR resonances attributed to methyl groups C-26 and C-27 of fridelin.
This phytochemical study performed with the cytotoxic chloroformic extract of Eriope blanchetii (Benth.) Harley was the first work with this species and describes from aerial parts the isolation of two lignans of podophylotoxin type named beta-peltatin and alpha-peltatin. Besides them it was obtained four triterpenes; oleanolic acid, ursolic acid, 2alpha,3beta-dihydroxy-urs-12-en-28-olic acid, 2alpha,3beta,19alpha-trihydroxy-urs-12-en-28-olic acid, named tormentic acid and 3beta-glucosyl-sitosterol. The compounds were identified by analysis of their spectral data.