Chemical constituents isolated from turnera subulata Sm. and electrochemical characterization of phaeophytin b

• Autor(a) principal: Brito Filho,Severino Gonçalves de
• Data de Publicação: 2014
• Outros Autores: Fernandes,Marianne Guedes, Chaves,Otemberg Souza, Chaves,Maria Célia de Oliveira, Araruna,Felipe Bastos, Eiras,Carla, Leite,José Roberto de Souza de Almeida, Agra,Maria de Fátima, Braz-Filho,Raimundo, de Souza,Maria de Fátima Vanderlei
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000400005
• topic: Turneroideae; Turnera subulata; Phaeophytins

Turnera subulata Sm., known as "Chanana" or "flor-do-Guarujá" in Brazilian folklore, is a plant species belonging to the subfamily Turneroideae of family Passifloraceae, which is used for various medicinal purposes in Brazil. The phytochemical study conducted here led to the isolation and identification of ten compounds present in T. subulata: two mixtures of steroids, sitosterol and stigmasterol (nonglycosylated and glycosylated); a mixture of flavonoids, 5,7,4′-trihidroxiflavona-8-C-α-glucopyranoside and 5,7,3′,4′-tetrahidroxiflavona-8-C-α-glucopyranosidel; and four phaeophytins, phaeophytin purpurin-18-phytyl ester, a rare natural product, phaeophytin a , 13²-hydroxy-(13²-S)-phaeophytin a , and phaeophytin b Phaeophytin b exhibited electrochemical activity similar to that of phthalocyanines.