KFU. Card publication. Electrode Based on the MWCNTs and Electropolymerized Thymolphthalein for the Voltammetric Determination of Total Isopropylmethylphenols in Spices

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ELECTRODE BASED ON THE MWCNTS AND ELECTROPOLYMERIZED THYMOLPHTHALEIN FOR THE VOLTAMMETRIC DETERMINATION OF TOTAL ISOPROPYLMETHYLPHENOLS IN SPICES

Form of presentation

Articles in international journals and collections

Year of publication

2023

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Authors, employees of KFU

Ziyatdinova Guzel Kamilevna, author

Authors, students KFU

Chernousova Natalya Anatolevna, author

Bibliographic description in the original language

Chernousova, N. Electrode based on the MWCNTs and electropolymerized thymolphthalein for the voltammetric determination of total isopropylmethylphenols in spices / N. Chernousova, G. Ziyatdinova // Micromachines. - 2023. - V. 14. - � 3. - Article 636. - 18 p.

Annotation

Isopropylmethylphenols, namely thymol and carvacrol, are natural phenolic monoterpenoids with a wide spectrum of bioactivity making them applicable in the cosmetic, pharmaceutical, and food industry. The dose-dependent antioxidant properties of isopropylmethylphenols require their quantification in real samples. Glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWCNTs) and electropolymerized thymolphthalein has been developed for the sensitive quantification of isopropylmethylphenols. Conditions of thymolphthalein electropolymerization (monomer concentration, number of cycles, and electrolysis parameters) providing the best response to thymol have been found. Scanning electron microscopy and electrochemical methods confirm the effectivity of the electrode developed. The linear dynamic ranges of 0.050–25 and 25–100 ?M for thymol and 0.10–10 and 10–100 ?M for carvacrol with detection limits of 0.037 and 0.063 ?M, respectively, have been achieved in differential pulse mode in Britton–Robinson buffer pH 2.0. The selectivity of the isopropylmethylphenols response in the presence of typical interferences (inorganic ions, saccharides, ascorbic acid) and other phenolics (caffeic, chlorogenic, gallic and rosmarinic acids, and quercetin) is a significant advantage over other electrochemical methods. The electrode has been used in the analysis of oregano and thyme spices. Total isopropylmethylphenols contents have been evaluated after a single sonication-assisted extraction with methanol.

Keywords

Chemically modified electrodes, voltammetry, electropolymerization, phthalein dyes, thymol, carvacrol, spices, food analysis

The name of the journal

Micromachines

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

https://repository.kpfu.ru/eng/?p_id=279815&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ziyatdinova Guzel Kamilevna	ru_RU
dc.contributor.author	Chernousova Natalya Anatolevna	ru_RU
dc.date.accessioned	2023-01-01T00:00:00Z	ru_RU
dc.date.available	2023-01-01T00:00:00Z	ru_RU
dc.date.issued	2023	ru_RU
dc.identifier.citation	Chernousova, N. Electrode based on the MWCNTs and electropolymerized thymolphthalein for the voltammetric determination of total isopropylmethylphenols in spices / N. Chernousova, G. Ziyatdinova // Micromachines. - 2023. - V. 14. - � 3. - Article 636. - 18 p.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=279815&p_lang=2	ru_RU
dc.description.abstract	Micromachines	ru_RU
dc.description.abstract	Isopropylmethylphenols, namely thymol and carvacrol, are natural phenolic monoterpenoids with a wide spectrum of bioactivity making them applicable in the cosmetic, pharmaceutical, and food industry. The dose-dependent antioxidant properties of isopropylmethylphenols require their quantification in real samples. Glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWCNTs) and electropolymerized thymolphthalein has been developed for the sensitive quantification of isopropylmethylphenols. Conditions of thymolphthalein electropolymerization (monomer concentration, number of cycles, and electrolysis parameters) providing the best response to thymol have been found. Scanning electron microscopy and electrochemical methods confirm the effectivity of the electrode developed. The linear dynamic ranges of 0.050–25 and 25–100 ?M for thymol and 0.10–10 and 10–100 ?M for carvacrol with detection limits of 0.037 and 0.063 ?M, respectively, have been achieved in differential pulse mode in Britton–Robinson buffer pH 2.0. The selectivity of the isopropylmethylphenols response in the presence of typical interferences (inorganic ions, saccharides, ascorbic acid) and other phenolics (caffeic, chlorogenic, gallic and rosmarinic acids, and quercetin) is a significant advantage over other electrochemical methods. The electrode has been used in the analysis of oregano and thyme spices. Total isopropylmethylphenols contents have been evaluated after a single sonication-assisted extraction with methanol.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Chemically modified electrodes	ru_RU
dc.subject	voltammetry	ru_RU
dc.subject	electropolymerization	ru_RU
dc.subject	phthalein dyes	ru_RU
dc.subject	thymol	ru_RU
dc.subject	carvacrol	ru_RU
dc.subject	spices	ru_RU
dc.subject	food analysis	ru_RU
dc.title	Electrode Based on the MWCNTs and Electropolymerized Thymolphthalein for the Voltammetric Determination of Total Isopropylmethylphenols in Spices	ru_RU
dc.type	Articles in international journals and collections	ru_RU