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Electrooxidation of morin on glassy carbon electrode modified by carboxylated single-walled carbon nanotubes and surfactants
Authors
Budnikov H.
Ziganshina E.
Ziyatdinova G.
Publication date
1 January 2014
Publisher
Abstract
© 2014 Elsevier Ltd. All rights reserved. Voltammetric characteristics of morin on glassy carbon electrode (GCE) modified by carboxylated single-walled carbon nanotubes (SWNT-COOH) and surfactants in phosphate buffer have been found. Cationic cetylpyridium bromide (CPB), nonionic Triton X100 and anionic sodium dodecylsulfate surfactants under different concentrations have been tested as modifier of SWNT-COOH/GCE. The form of CVs and oxidation potentials are not changed significantly in the presence of all type surfactants on the electrode surface that confirms negligible influence of surfactant on electron transfer rate. Morin oxidation currents are increased on surfactant-modified electrodes. The best characteristics are observed on CPB (1 μM)/SWNT-COOH/GCE when 1.8-fold increase of oxidation currents has been observed in comparison with SWNT-COOH/GCE. Mechanism of morin oxidation on CPB/SWNT-COOH/GCE is suggested on the basis of relationship between oxidation potential and pH of supporting electrolyte. Electrooxidation is adsorption-controlled irreversible two-step process with participation of one electron and one proton on each step. The linear dynamic ranges of morin determination under conditions of differential pulse voltammetry are 0.1-100 and 100-750 μM with the limits of detection and quantification 28.9 and 96.0 nM of morin, respectively. The developed approach applied for morin quantification in mulberry leaves using preliminary extraction with ethanol
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Kazan Federal University Digital Repository
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oai:dspace.kpfu.ru:net/136109
Last time updated on 07/05/2019
Kazan Federal University Digital Repository
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:dspace.kpfu.ru:net/93802
Last time updated on 07/05/2019