A new flavonol glycoside derivative from leaves of Moldenhawera nutans.
The ethyl acetate extract of leaves of Moldenhawera nutans Queiroz & Alkin (Leguminosae) furnished, besides methyl gallate and gallic acid, the flavonols named laricetrin, laricetrin 3-glucoside and laricetrin 3-galactoside as well as the new one named laricetrin 5-galloyl-3-beta-D-xylopyranoside. It also was isolated from the hexane extract: beta-sitosterol, lupenone, beta-amyrinone, alpha-amyrinone, lupeol, beta-amyrin, alpha-amyrin and alpha-tocopherol. The antioxidant activities of flavonoids were measured through DPPH radical scavenging and inhibition of auto-oxidation of beta-carotene methods. The structures of the compounds were determined by analyses of spectral data. This is the first report dealing with phytochemical studies of leaves of M. nutans. In addition this current work describes the unequivocal attribution of 1H NMR and 13C NMR data of laricetrin.
do Vale
Ademir E
AE
Instituto de Química, Universidade Federal da Bahia, 40170-290 Salvador, BA, Brazil.
David
Jorge M
JM
Brandão
Hugo N
HN
David
Juceni P
JP
D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001938:Brazil; D016166:Free Radical Scavengers; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry*; D024505:Tocopherols / Q000737:chemistry / Q000302:isolation & purification; D014329:Tropical Climate
D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts; D024505:Tocopherols