Resumo
This work describes the evaluation of the antioxidant activity in the system b-carotene / linoleic acid and radical scavenging effects of the substances 2',4'-dihydroxychalcone, 2',3,4,4'-tetrahydroxychalcone (butein), 4-methoxy-2',3,4'-trihydroxychalcone, 7-hydroxyflavanone, 3',4',7-trihydroxyflavanone (butin), 7,4'-dihydroxyflavanone (liquiritigenin), 6-methoxy-7- hydroxydihydroflavonol and lasiodiplodin isolated of the extract CHCl3 of the stem of Dioclea violacea and 3',4',5,7-tetrahydroxyflavanol (quercetin), 4',7- dimethoxy-3',5-dihydroxyflavanol and epicatechin isolated of the Erythroxylum nummularia leaves. These compounds were evaluated and compared with the antioxidant standards n-propyl gallate, BHT and á α-tocoferol.
Atividade antioxidante de substâncias presentes em Dioclea violacea e Erythroxylum nummularia
Barreiros, A.L.B.SI; Barreiros, M.L.I; David, J.M.I; David, J.P.II; Queiroz, L.P. deIII
IInstituto de Química
IIFaculdade de Farmácia, Universidade Federal da Bahia, 40170-280, Salvador, BA, Brasil
IIIDepartamento de Ciências Biológicas - Universidade Estadual de Feira de Santana, 44031-460, Feira de Santana, BA, Brasil
ABSTRACT
This work describes the evaluation of the antioxidant activity in the system b-carotene / linoleic acid and radical scavenging effects of the substances 2',4'-dihydroxychalcone, 2',3,4,4'-tetrahydroxychalcone (butein), 4-methoxy-2',3,4'-trihydroxychalcone, 7-hydroxyflavanone, 3',4',7-trihydroxyflavanone (butin), 7,4'-dihydroxyflavanone (liquiritigenin), 6-methoxy-7- hydroxydihydroflavonol and lasiodiplodin isolated of the extract CHCl3 of the stem of Dioclea violacea and 3',4',5,7-tetrahydroxyflavanol (quercetin), 4',7- dimethoxy-3',5-dihydroxyflavanol and epicatechin isolated of the Erythroxylum nummularia leaves. These compounds were evaluated and compared with the antioxidant standards n-propyl gallate, BHT and á α-tocoferol.
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Agradecimentos
Os autores são gratos ao CNPq e CAPES pelo suporte financeiro e bolsas.
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Datas de Publicação
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Publicação nesta coleção
25 Set 2009 -
Data do Fascículo
2003
