A New Neolignan and Antioxidant Phenols from Nectandra grandiflora
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چکیده
O extrato etanólico das folhas de Nectandra grandiflora coletadas na Mata Atlântica, Brasil, mostrou atividade antioxidante frente ao β-caroteno em teste usando cromatografia em camada delgada. O fracionamento biomonitorado levou ao isolamento do ácido protocatecuico e de dois flavonóides glicosilados: afzelina e quercetrina, os quais exibiram atividade sequestradora de radicais livres frente ao DPPH (∆A 32, 16 e 73% a 50 μmol L) e foram comparados aos antioxidantes comerciais rutina (81% a 50 μmol L) e BHT (9% a 50 μmol L), usados como substâncias de referência. Além disso, três neolignanas inativas, incluindo a nova neolignana biciclo[3.2.1]octânica 2’-oxo-piperol B, foram obtidas e caracterizadas por métodos espectrométricos.
منابع مشابه
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تاریخ انتشار 2005