SciELO - Scientific Electronic Library Online

vol.29 número6Estudo termogravimétrico do efeito da temperatura e da atmosfera na absorção de dióxido de enxofre por calcárioIron oxide and pyrocatechol: a spectroscopy study of the reaction products índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Química Nova

versão On-line ISSN 1678-7064


SILVA, Davi Antas e et al. Chemical constituents and antioxidant activity of Sida galheirensis Ulbr. (Malvaceae). Quím. Nova [online]. 2006, vol.29, n.6, pp. 1250-1254. ISSN 1678-7064.

The phytochemical investigation of Sida galheirensis led to the isolation of 5,4'-dihydroxy-3,7,3´-trimethoxyflavone, 173-ethoxyphaeoforbide, a rare natural product, 6,7-dimethoxycoumarin, ortho-hydroxybenzoic acid, sitosterol-3-O-b-D-glucopyranoside, stigmasterol-3-O-b-D-glucopyranoside, 5,7,4'-trihydroxyflavone, 5,7,3',4'-tetrahydroxyflavone, kaempferol-3-O-b-D-(6"-E-p-coumaroyl) glucopyranoside and luteolin 7-O-b-D-glucopyranoside. Their structures were assigned based on spectroscopic analyses, including two-dimensional NMR techniques. Antioxidant activities of hexane, CHCl3, EtOAc, BuOH and EtOH extracts of Sida galheirensis were measured using the 1,2-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging assay. This is also the first work reporting the chemical investigation of Sida galheirensis.

Palavras-chave : Sida galheirensis; Malvaceae; flavonoids.

        · texto em Português     · Português ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License