Chemical constituents from three medicinal plants: Piper renitens, Siparuna guianensis and Alternanthera brasiliana

• Autor(a) principal: Facundo,Valdir A.
• Data de Publicação: 2012
• Outros Autores: Azevedo,Mariangela S., Rodrigues,Rosely V., Nascimento,Leandro F. do, Militão,Júlio S. L. T., Silva,Gil V. J. da, Braz-Filho,Raimundo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Brasileira de Farmacognosia (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-695X2012000500027
• topic: Piper renitens; Siparuna guianensis; Alternanthera brasiliana; ent-kaunare diterpene; kaempferol-methylether; flavonoids

Chemical study of three medicinal plants: from leaves of Piper renitens (Miq.) Yunck, Piperaceae, and Siparuna guianensis Aubl., Siparunaceae, and from flowers of Alternanthera brasiliana (L.) Kuntze, Amaranthaceae, resulted in isolation of nine compounds: three steroids, β-sitosterol, stigmasterol from P. renitens and sitosterol-3-O-β-D-glucopyranoside from A. brasiliana, the diterpene kaurane ent-kauran-16α,17-diol from P. renitens, two derivatives kaempferol-methylether, kumatakenine (kaempferol-3,7-dimethylether) and kaempferol-3,7,3'-trimethylether from S. guianensis and three flavones, crysoeriol (5,7,4'-trihydroxy-3'-methoxyflavone), tricin (5,7,4'-trihydroxy-3',5'-dimethoxyflavone) and 7-O-β-D-glucopyranoside-5,4'-dihydroxy-3'-methoxyflavone from A. brasiliana. Compounds structures were determinate using 1D and 2D ¹H NMR and 13C spectral data, mass and IR spectra, comparing with literature data.