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Título: Evaluation of the antioxidant and phototoxic potentials of Bauhinia microstachya var. massambabensis Vaz leaf extracts
Autores: Mansur, Maria Cristina.P.P.R.
Leitão, Susana G.
Lima, Luis M.T.R.
Ricci-Júnior, Eduardo
Souza, Gabriela R. de
Barbi, Nancy dos S.
Martins, Tathiana S.
Dellamora Ortiz, Gisela M.
Leo, Rodrigo R. T.
Vieira, Ricardo C.
Leitão, Gilda G.
Santos, Elizabete P.
Fecha: 2012-05-11
2012
Publicador: Unversidad Nacional de La Plata
Fuente:


Tipo: Articulo
Articulo
Tema: Farmacia
Extractos Vegetales
Flavonoides
Bauhinia
Antioxidantes
Descripción: Four different leaf extracts of B. microstachya var. massambabensis were studied to evaluate their antioxidant capacity by using three in vitro methods, with Ginkgo biloba and Trolox® as the standards. With the DPPH and ABTS·+ methods, the antioxidant activity of the extracts was in the following order, from maximum to minimum: AcEt > WAc > raw EtOH > EtOH CA > EGb, while with the ORAC method, it was as follows: EtOH CA > raw EtOH > AcEt > WAc > EGb. Phototoxic analysis was performed in yeast cultures of Saccharomyces cerevisiae. From the ethyl acetate extract, 2 flavonoids kaempferol-3-O-rhamnoside and astragalin-2”,6”-O-digallate were isolated and identified by HPLC and 1H- and 13C-NMR; to our knowledge, this is the first report of the occurrence of astragalin-2”,6”-O-digallate in the Bauhinia genus.
Idioma: Inglés