Fenóis totais e atividade antioxidante de cinco plantas medicinais

Sousa, Cleyton Marcos de M., Silva, Hilris Rocha e, Vieira-Jr., Gerardo Magela, Ayres, Mariane Cruz C., Costa, Charllyton Luis S. da, Araújo, Delton Sérvulo, Cavalcante, Luis Carlos D., Barros, Elcio Daniel S., Araújo, Paulo Breitner de M., Brandão, Marcela S., Chaves, Mariana H.

Fenóis totais e atividade antioxidante de cinco plantas medicinais

AUTOR(ES)

Sousa, Cleyton Marcos de M., Silva, Hilris Rocha e, Vieira-Jr., Gerardo Magela, Ayres, Mariane Cruz C., Costa, Charllyton Luis S. da, Araújo, Delton Sérvulo, Cavalcante, Luis Carlos D., Barros, Elcio Daniel S., Araújo, Paulo Breitner de M., Brandão, Marcela S., Chaves, Mariana H.

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2007-04

RESUMO

This paper describes total phenolics content and antioxidant activity in the ethanolic extract of leaves, bark and roots of five medicinal plants: Terminalia brasiliensis Camb., Terminalia fagifolia Mart. & Zucc., Copernicia cerifera (Miller) H.E. Moore, Cenostigma macrophyllum Tul. var. acuminata Teles Freire and Qualea grandiflora Mart. The total phenolics content of the plant extracts, determined by the Folin-Ciocalteu method, varied from 250.0 ±8,2 to 763,63 ± 13.03 mg of gallic acid equivalent/g dry EtOH extract. The antioxidant activity of extracts was evaluated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay system. Extract of bark from T. brasiliensis, the most active, with an EC50 value of 27.59 ± 0.82 µg/mL, was comparable to rutin (EC50 = 27.80 ± 1.38) and gallic acid (EC50 = 24.27 ± 0.31), used as positive controls. The relationship between total phenolic content and antioxidant activity was positive and significant for T. brasiliensis, C. macrophyllum and C. cerifera.