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Polyquercetin/MWNT‐modified Electrode for the Determination of Natural Phenolic Antioxidants
Author(s) -
Ziyatdinova Guzel,
Kozlova Ekaterina,
Budnikov Herman
Publication year - 2017
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.201700440
Subject(s) - gallic acid , catechin , electrode , chemistry , antioxidant , differential pulse voltammetry , dpph , epigallocatechin gallate , carbon nanotube , detection limit , nuclear chemistry , chromatography , materials science , organic chemistry , electrochemistry , cyclic voltammetry , nanotechnology , polyphenol
Novel highly sensitive voltammetric method for the gallic acid, catechin and epigallocatechin gallate (EGCG) quantification has been developed using glassy carbon electrode modified with multi‐walled carbon nanotubes and polyquercetin (polyquercetin/MWNT/GCE). The effect of electropolymerization parameters (number of cycles, monomer concentration and polarization window) on the electrode characteristics has been evaluated. The electrode surface has been characterized with SEM, CV and EIS. The linear dynamic ranges of 0.50–10 and 10–750 μM for gallic acid, 0.10–10 and 10.0–250 μM for catechin and 0.050–10 and 10–100 μM for EGCG have been obtained in differential pulse mode with the detection limits of 0.10, 0.024 and 0.014 μM, respectively. The approach has been successfully applied for the tea antioxidant capacity evaluation (AOC). The positive correlations with antioxidant activity towards DPPH • and total phenolics ( r =0.7845 and 0.7658 at r crit =0.4227, n =22) have been obtained.