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Type: Artigo de periódico
Title: Luxenchalcone, a new bichalcone and other constituents from Luxemburgia octandra
Author: Carvalho, Mário G. de
Alves, Cassia C. Fernandes
Silva, Kedma G. S. da
Eberlin, Marcos N
Werle, Alceni A
Abstract: Chromatographic fractionation of leaves and branches extracts from Luxemburgia octandra (Ochnaceae) afforded isoliquiritigenin, 3'-hydroxyisoliquiritigenin, b-sitosterol, stigmasterol, lupeol, betulinic acid, the biflavonoid, 4',5,7-trihydroxyflavone-(3'®O®4')-5,7-dihydroxyflavanone and a new bichalcone 4,2',4'-trihydroxychalcone-(3®O®4)-2',4'-dihydroxychalcone (luxenchalcone). The structures were established from analysis of IR, MS and NMR spectral data, including 2D-NMR experiments of the natural substances and of the luxenchalcone methyl derivative.
O fracionamento cromatográfico dos extratos de folhas e galhos de Luxemburgia octandra (Ochnaceae) resultou no isolamento de: isoliquiritigenina, 3'-hidroxiisoliquiritigenina, b-sitosterol, estigmasterol, lupeol, ácido betulínico, o biflavonóide, 4',5,7-triidroxiflavona-(3'®O®4')-5,7 -diidroxiflavanona e uma nova bichalcona, 4,2',4'-triidroxichalcona-(3®O®4)-2',4' -diidroxichalcona (luxenchalcona). As estruturas desses compostos foram estabelecidas com base na análise dos dados espectrométricos de IV, EM e RMN incluindo experimentos 2D das substâncias naturais e do derivado metilado da luxenchalcona.
Subject: Luxemburgia octandra
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0103-50532004000100023
Date Issue: 1-Feb-2004
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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