Antioxidant flavan-3-ols and flavonol glycosides from Maytenus aquifolium |
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Authors: | Corsino Joaquim Silva Dulce Helena Siqueira Zanoni Maria Valnice Boldrin da Silva Bolzani Vanderlan França Suzelei Castro Pereira Ana Maria S Furlan Maysa |
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Institution: | Instituto de Química, Universidade Estadual Paulista, Araraquara, SP, Brazil. |
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Abstract: | TLC autographic assay revealed, in the EtOAc extract obtained from leaves and root bark of Maytenus aquifolium (Celastraceae), the presence of fi ve 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. |
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Keywords: | Maytenus aquifolium Celastraceae ?avonoid antioxidants cyclic voltammetry free radical scavenger |
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