Química Nova (Dec 2006)

Constituintes químicos e atividade antioxidante de Sida galheirensiS Ulbr. (Malvaceae)

  • Davi Antas e Silva,
  • Tânia Maria Sarmento da Silva,
  • Antônio Cláudio da Silva Lins,
  • Danielly Albuquerque da Costa,
  • José Marcílio Sobral Cavalcante,
  • Wemerson Neves Matias,
  • Maria de Fátima Vanderlei de Souza,
  • Raimundo Braz Filho

DOI
https://doi.org/10.1590/S0100-40422006000600020
Journal volume & issue
Vol. 29, no. 6
pp. 1250 – 1254

Abstract

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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-beta-D-glucopyranoside, stigmasterol-3-O-beta-D-glucopyranoside, 5,7,4'-trihydroxyflavone, 5,7,3',4'-tetrahydroxyflavone, kaempferol-3-O-beta-D-(6"-E-p-coumaroyl) glucopyranoside and luteolin 7-O-beta-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.

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