KFU. Card publication. Voltammetry of morin on electrode modified with carbon nanotubes and surfactants

KAZAN
FEDERAL UNIVERSITY

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VOLTAMMETRY OF MORIN ON ELECTRODE MODIFIED WITH CARBON NANOTUBES AND SURFACTANTS

Form of presentation

Conference proceedings in international journals and collections

Year of publication

2014

Authors, employees of KFU

Budnikov German Konstantinovich, author

Ziganshina Endzhe Rishatovna, author

Ziyatdinova Guzel Kamilevna, author

Bibliographic description in the original language

Ziyatdinova G. Voltammetry of morin on electrode modified with carbon nanotubes and surfactants / G. Ziyatdinova, E. Ziganshina, H. Budnikov // 65th Annual Meeting of the International Society of Electrochemistry "Ubiquitous Electrochemistry" (August, 31 – September, 5, 2014). Lausanne, 2014. – Book Abstr. – P.ISE140389.

Annotation

Surfactants are widely used in analytical chemistry at present time. Two important properties of surfactants namely adsorption at the interface and aggregation into organized structures are advantageously used in electrochemistry. Therefore, surfactants are able to modify and control the properties of electrode surfaces leading to changes in reaction rates and pathways. Combination of surfactants with carbon nanomaterials as electrode surface modifier is another opportunity to affect on electrochemical processes. Phenolic antioxidants are important biologically active compounds with a wide variety of physiological effects including ability to scavenge free radicals and making them an important object of analysis in life sciences. Antioxidant properties of phenolic compounds cause their ability to oxidation on electrode surface. Voltammetric behavior of morin has been investigated on glassy carbon electrodes (GCE) modified with carbon nanotubes and surfactants which are electrochemically inactive at anodic potentials under investigation. Carboxylated SWNT (SWNT-COOH) has shown electrocatalytic activity towards morin oxidation. Cationic (cetylpyridium bromide (CPB)), anionic (sodium dodecyl sulfate (SDS)) and nonionic (Triton X100) surfactants have been investigated as modifiers of SWNT-COOH/GCE. The form of CVs and oxidation potentials do not change 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 electrode. The best characteristics are observed on CPB (1μM)/SWNT-COOH/GCE when 1.8-fold increase of oxidation currents has been observed in comparison with SWNT-COOH/GCE. This can be explained by electrostatic interaction between morin anion (pKa1=4.99) and CPB. CPB forms a positively charged hydrophilic film on the CPB/SWNT-COOH/GCE that leads to concentration of morin on the electrode surface and, therefore, the oxidation current is increased. 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 irreversible two-step process with participation of one electron and one proton on each step. Adsorption-controlled feature of the electrochemical process has been confirmed. Differential pulse voltammetry has been applied for morin quantification. The linear dynamic ranges for 0.1-100 and 100-750 μM of morin are observed. The LOD and LOQ are 28.9 and 96 nM of morin, respectively. Both parameters indicate satisfactory sensitivity of the developed approach.

Keywords

Voltammetry, morin, chemically modified electrodes, surfactants, carbon nanotubes

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=85651&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Budnikov German Konstantinovich	ru_RU
dc.contributor.author	Ziganshina Endzhe Rishatovna	ru_RU
dc.contributor.author	Ziyatdinova Guzel Kamilevna	ru_RU
dc.date.accessioned	2014-01-01T00:00:00Z	ru_RU
dc.date.available	2014-01-01T00:00:00Z	ru_RU
dc.date.issued	2014	ru_RU
dc.identifier.citation	Ziyatdinova G. Voltammetry of morin on electrode modified with carbon nanotubes and surfactants / G. Ziyatdinova, E. Ziganshina, H. Budnikov // 65th Annual Meeting of the International Society of Electrochemistry "Ubiquitous Electrochemistry" (August, 31 – September, 5, 2014). Lausanne, 2014. – Book Abstr. – P.ISE140389.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=85651&p_lang=2	ru_RU
dc.description.abstract	Surfactants are widely used in analytical chemistry at present time. Two important properties of surfactants namely adsorption at the interface and aggregation into organized structures are advantageously used in electrochemistry. Therefore, surfactants are able to modify and control the properties of electrode surfaces leading to changes in reaction rates and pathways. Combination of surfactants with carbon nanomaterials as electrode surface modifier is another opportunity to affect on electrochemical processes. Phenolic antioxidants are important biologically active compounds with a wide variety of physiological effects including ability to scavenge free radicals and making them an important object of analysis in life sciences. Antioxidant properties of phenolic compounds cause their ability to oxidation on electrode surface. Voltammetric behavior of morin has been investigated on glassy carbon electrodes (GCE) modified with carbon nanotubes and surfactants which are electrochemically inactive at anodic potentials under investigation. Carboxylated SWNT (SWNT-COOH) has shown electrocatalytic activity towards morin oxidation. Cationic (cetylpyridium bromide (CPB)), anionic (sodium dodecyl sulfate (SDS)) and nonionic (Triton X100) surfactants have been investigated as modifiers of SWNT-COOH/GCE. The form of CVs and oxidation potentials do not change 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 electrode. The best characteristics are observed on CPB (1μM)/SWNT-COOH/GCE when 1.8-fold increase of oxidation currents has been observed in comparison with SWNT-COOH/GCE. This can be explained by electrostatic interaction between morin anion (pKa1=4.99) and CPB. CPB forms a positively charged hydrophilic film on the CPB/SWNT-COOH/GCE that leads to concentration of morin on the electrode surface and, therefore, the oxidation current is increased. 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 irreversible two-step process with participation of one electron and one proton on each step. Adsorption-controlled feature of the electrochemical process has been confirmed. Differential pulse voltammetry has been applied for morin quantification. The linear dynamic ranges for 0.1-100 and 100-750 μM of morin are observed. The LOD and LOQ are 28.9 and 96 nM of morin, respectively. Both parameters indicate satisfactory sensitivity of the developed approach.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Voltammetry	ru_RU
dc.subject	morin	ru_RU
dc.subject	chemically modified electrodes	ru_RU
dc.subject	surfactants	ru_RU
dc.subject	carbon nanotubes	ru_RU
dc.title	Voltammetry of morin on electrode modified with carbon nanotubes and surfactants	ru_RU
dc.type	Conference proceedings in international journals and collections	ru_RU