Voltammetric determination of antioxidant character in Berberis lycium Royel, Zanthoxylum armatum and Morus nigra Linn plants.
Pak J Pharm Sci
; 25(3): 501-7, 2012 Jul.
Article
em En
| MEDLINE
| ID: mdl-22713934
ABSTRACT
The antioxidant activity potential of three different plant extracts was investigated against superoxide anion radical while employing cyclic voltammetry technique. The plants Berberis lyceum Royle, Morus nigra Linn and Zanthoxylum armatum were selected because of their potential use in the traditional medicine. The voltammetric response of the electrochemically generated superoxide anion radial in DMSO was monitored in the absence and presence of the plat extracts. The decrease in the current was interpreted in terms of antiradical activity of the added extract. The thermodynamic feasibility of the radical scavenging by extracts was accounted in terms of antioxidant activity coefficient (K(ao)) and standard Gibbs free energy (ΔG(o)). The values of K(ao) and ΔG(o) ranged from 1.0 x 102 to 57 x 102 L(-1) and -18 to -27 kJmol(-1), respectively. The possible mechanism of the antioxidant reaction was regarded as E(r)C(i) mechanism i.e. reversible electron transfer followed by hydrogen atom transfer- an irreversible chemical reaction.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Extratos Vegetais
/
Berberis
/
Morus
/
Zanthoxylum
/
Antioxidantes
Idioma:
En
Revista:
Pak J Pharm Sci
Assunto da revista:
FARMACIA
/
FARMACOLOGIA
/
QUIMICA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Paquistão