КФУ. Карточка публикации. Novel modified electrode with immobilized galvinoxyl radical for the voltammetric determination of antioxidant activity

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NOVEL MODIFIED ELECTRODE WITH IMMOBILIZED GALVINOXYL RADICAL FOR THE VOLTAMMETRIC DETERMINATION OF ANTIOXIDANT ACTIVITY

Форма представления

Статьи в зарубежных журналах и сборниках

Год публикации

2020

Язык

английский

Авторы, сотрудники КФУ

Будников Герман Константинович, автор

Зиятдинова Гузель Камилевна, автор

Авторы, студенты КФУ

Снегурева Юлия Владимировна, автор

Библиографическое описание на языке оригинала

Ziyatdinova, G. Novel modified electrode with immobilized galvinoxyl radical for the voltammetric determination of antioxidant activity / G. Ziyatdinova, Yu. Zelenova, H. Budnikov // J. Electroanal. Chem. – 2020. – V. 586. - Art. № 113677. - 7 p.

Аннотация

Galvinoxyl radical (GO) immobilized on the electrode surface has been used for the voltammetric determination of antioxidant activity for the first time. Immobilization of radical on glassy carbon electrode (GCE) provides improvement of the system reversibility as well as increase of the redox currents in comparison to GO reduction in solution. But sensitivity of response is insufficient for the antioxidant activity estimation. Application of GCE modified with dispersion of CeO2 nanoparticles (NP) in cationic surfactant cetylpyridinium bromide (CPB) medium (CeO2 NP-CPB/GCE) as a base for GO immobilization provide full reversibility of its reduction (redox currents ratio of 1.02 and peak potential separation of 80 mV) and 7-fold increase of the redox currents at physiological pH of supporting electrolyte. Electrode developed has been successfully applied for the voltammetric evaluation of natural phenolics antioxidant activity expressed as the EC50 parameter (effective concentration of the antioxidant providing 50% inhibition of GO) and antioxidant activity of herbal preparations (tinctures, infusions and decoctions) as relative GO inhibition. Antioxidant activity of natural phenolics is decreased as morin > quercetin = ferulic acid > gallic acid > tannin ≈ catechin. The results obtained agree well with data of standard spectrophotometric method. The advantages of the method developed are 4-fold lower incubation time, less consumption of the reagents and the absence of limitations for colored samples.

Ключевые слова

Cyclic voltammetry, chemically modified electrodes, galvinoxyl radical, cerium dioxide nanoparticles, antioxidant activity, phytochemical analysis

Название журнала

Journal of Electroanalytical Chemistry

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076009922&doi=10.1016%2fj.jelechem.2019.113677&partnerID=40&md5=2a50ed89c0d99c79cf0fa6a431608357

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https://repository.kpfu.ru/?p_id=227935

Полная запись метаданных

Поле DC	Значение	Язык
dc.contributor.author	Будников Герман Константинович	ru_RU
dc.contributor.author	Зиятдинова Гузель Камилевна	ru_RU
dc.contributor.author	Снегурева Юлия Владимировна	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Ziyatdinova, G. Novel modified electrode with immobilized galvinoxyl radical for the voltammetric determination of antioxidant activity / G. Ziyatdinova, Yu. Zelenova, H. Budnikov // J. Electroanal. Chem. – 2020. – V. 586. - Art. № 113677. - 7 p.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/?p_id=227935	ru_RU
dc.description.abstract	Journal of Electroanalytical Chemistry	ru_RU
dc.description.abstract	Galvinoxyl radical (GO) immobilized on the electrode surface has been used for the voltammetric determination of antioxidant activity for the first time. Immobilization of radical on glassy carbon electrode (GCE) provides improvement of the system reversibility as well as increase of the redox currents in comparison to GO reduction in solution. But sensitivity of response is insufficient for the antioxidant activity estimation. Application of GCE modified with dispersion of CeO2 nanoparticles (NP) in cationic surfactant cetylpyridinium bromide (CPB) medium (CeO2 NP-CPB/GCE) as a base for GO immobilization provide full reversibility of its reduction (redox currents ratio of 1.02 and peak potential separation of 80 mV) and 7-fold increase of the redox currents at physiological pH of supporting electrolyte. Electrode developed has been successfully applied for the voltammetric evaluation of natural phenolics antioxidant activity expressed as the EC50 parameter (effective concentration of the antioxidant providing 50% inhibition of GO) and antioxidant activity of herbal preparations (tinctures, infusions and decoctions) as relative GO inhibition. Antioxidant activity of natural phenolics is decreased as morin > quercetin = ferulic acid > gallic acid > tannin ≈ catechin. The results obtained agree well with data of standard spectrophotometric method. The advantages of the method developed are 4-fold lower incubation time, less consumption of the reagents and the absence of limitations for colored samples.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Cyclic voltammetry	ru_RU
dc.subject	chemically modified electrodes	ru_RU
dc.subject	galvinoxyl radical	ru_RU
dc.subject	cerium dioxide nanoparticles	ru_RU
dc.subject	antioxidant activity	ru_RU
dc.subject	phytochemical analysis	ru_RU
dc.title	Novel modified electrode with immobilized galvinoxyl radical for the voltammetric determination of antioxidant activity	ru_RU
dc.type	Статьи в зарубежных журналах и сборниках	ru_RU