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Química Nova

versão impressa ISSN 0100-4042

Resumo

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 0100-4042.  http://dx.doi.org/10.1590/S0100-40422006000600020.

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.

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