Total phenolics and antioxidant activity of five medicinal plants

Química Nova

Araújo, Paulo Breitner de M.¹  Silva, Hilris Rocha e¹  Universidade Federal do Piauí, Teresina, Brasil¹  Chaves, Mariana H.¹  Ayres, Mariane Cruz C.¹  Brandão, Marcela S.¹  Sousa, Cleyton Marcos de M.¹  Cavalcante, Luis Carlos D.¹  Araújo, Delton Sérvulo¹  Costa, Charllyton Luis S. da¹  Barros, Elcio Daniel S.¹  Vieira-Jr., Gerardo Magela¹ 

关键词: total phenolics;    antioxidant activity;    medicinal plants.;   

DOI  :  10.1590/S0100-40422007000200021

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown