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Thin‐Layer Cyclic Voltammetric and Scanning Electrochemical Microscopic Study of Antioxidant Activity of Ascorbic Acid at Liquid/Liquid Interface
Author(s) -
Lu Xiaoquan,
Hu Lina,
Wang Xiaoqiang
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200403201
Subject(s) - ascorbic acid , layer (electronics) , cyclic voltammetry , thin layer , electrochemistry , materials science , interface (matter) , liquid liquid , antioxidant , chemical engineering , analytical chemistry (journal) , chemistry , chromatography , organic chemistry , electrode , composite material , molecule , food science , engineering , gibbs isotherm
An electron transfer reaction between ascorbic acid (H 2 A) in an aqueous solution and oxidizing agent in an organic solution immiscible with water has been studied by thin‐layer cyclic voltammetry (TLCV) for charge transfer at the interface between two immiscible electrolyte solutions (ITIES). As an antioxidant, H 2 A provide electrons through the aqueous/organic interface to reduce Fc + and the procedure has been proved to be a one electron process again. In this work, the first combination of TLCV and scanning electrochemical microscopy (SECM) was achieved and showed a reasonable agreement between the results from the two different approaches. Otherwise, lower concentration ratios Kr of aqueous to organic reactants was adopted, which is given as evidence to the proposed procedure of Barker.