Electrochemical Study of Commercial Black Tea Samples

Black tea (BT) is a widely consumed natural product whose myriad of therapeutic applications rely on its constituents of remarkable antioxidant power. The electroanalysis is unique to provide a precise redox characterization of samples presenting a single compound or even a pool of electroactive spe...

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Bibliographic Details
Published in:International journal of electrochemical science 2018-06, Vol.13 (6), p.5433-5439
Main Authors: Thomaz, Douglas Vieira, de Siqueira Leite, Karla Carneiro, Moreno, Emily Kussmaul Gonçalves, Garcia, Luane Ferreira, Alecrim, Morgana Fernandes, Macêdo, Isaac Yves Lopes, Caetano, Marcos Pereira, de Carvalho, Murilo Ferreira, Machado, Fabio Bahls, de Souza Gil, Eric
Format: Article
Language:English
Subjects:
black tea
Free radical scavenging
redox characterization
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Summary:Black tea (BT) is a widely consumed natural product whose myriad of therapeutic applications rely on its constituents of remarkable antioxidant power. The electroanalysis is unique to provide a precise redox characterization of samples presenting a single compound or even a pool of electroactive species. Hence, this work aims to study the BT redox profile through electroanalytical methods. Voltammetric techniques such as Ciclic Voltammetry, Square Wave Voltammetry and Differential Pulse Voltammetry were conducted in BT crude vegetal mater samples and pharmaceutical grade standardized dried extract. It was found for all BT samples two anodic processes, the first occurring at peak potentials bellow +0.5V, thus indicating a strong antioxidant activity. The results related to BT pool compounds voltammetric profile suggested that the first anodic process is reversible, whereas the second irreversible. In addition, such electron/proton transfer reactions undergo EC mechanisms, which are mostly diffusion controlled electrochemical processes. Since low anodic potential and reversible redox behavior are related to high reducing power and good regenerating ability, it can be inferred, that the recognized antioxidant activity of BT samples is undeniable.
ISSN:1452-3981
1452-3981
DOI:10.20964/2018.06.55