Antioxidant flavan-3-ols and flavonol glycosides from Maytenus aquifolium
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Data
2003-09-01
Autores
Corsino, J.
Silva, DHS
Zanoni, Maria Valnice Boldrin [UNESP]
Bolzani, Vanderlan da Silva [UNESP]
Franca, S. C.
Pereira, AMS
Furlan, Maysa [UNESP]
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Editor
Wiley-Blackwell
Resumo
TLC autographic assay revealed, in the EtOAc extract obtained from leaves and root bark of Maytenus aquifolium (Celastraceae), the presence of five compounds exhibiting antioxidant properties towards beta-carotene. They were isolated and identified as epigallocatechin (1), (+) ouratea-catechin (2), proanthocyanidin (3), kaempferol 3-O-alpha-L-rhamnopyranosyl (1-->6)-O-[beta-D-glucopyranosyl (1-->3)-O-alpha-L-rhamnopyranosyl-(1-->2)]-O-beta-D-glucopyranosyl (4) and quercetin 3-O-alpha-L-rhamnopyranosyl (1-->6)-O-beta-D-glucopyranosyl (1-->3)-O-alpha-L-rhamnopyranosyl-(1-->2)-O-beta-D-glucopyranosyl (5). The isolates were investigated for their redox properties using cyclic voltammetry and for their radical scavenging abilities through spectrophotometric assay on the reduction of 2,2-diphenyl-pycryl hydrazyl (DPPH). These results were correlated to the inhibition of beta-carotene bleaching on TLC autographic assay and to structural features of the flavonoids. Copyright (C) 2003 John Wiley Sons, Ltd.
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Palavras-chave
Maytenus aquifolium, Celastraceae, flavonoid, antioxidants, cyclic voltammetry, free radical scavenger
Como citar
Phytotherapy Research. Chichester: John Wiley & Sons Ltd, v. 17, n. 8, p. 913-916, 2003.