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7. The Theoretical Description for Chlorantraniliprole Electrochemical Determination, Assisted by Squaraine Dye--Nano-CuS Composite

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Silvio C., Salomova, Hanifa Zh., Razhabova, Dilafruz B., Musayeva, Dilfuza M., Niyazov, Laziz N., Ivanushko, Yana G., Mytchenok, Mariia P., Ahafonova, Oleksandra V., Banul, Bohdana Yu, Honchar, Tetiana P., Yagodynets, Petro I., Kormosh, Zholt O., dos Reis, Lucinda Vaz, Bagrii, Konon L., Strutynska, Lyubov T., Danyliuk, Inna P., Gordiyenko, Nataliia M., Britsyna, Yulia V., Parkhomenko, Maryna V., and Levon, Mariia M.

Published
2021
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8. The Theoretical Description for Fluoxetine Electrochemical Determination, Assisted by CoO(OH)-Nanoparticles, Deposited Over the Squaraine Dye

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Silvio C., Salomova, Hanifa Zh., Jalilov, Fazliddin, Jalilova, Feruza, Musayeva, Dilfuza M., Niyazov, Laziz N., Ivanushko, Yana G., Ahafonova, Oleksandra V., Mytchenok, Maria P., Yagodynets, Petro I., Kormosh, Zholt O., Reis, Lucinda Vaz dos, and Palytsia, Yulia V.

Published
2021
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12. A descrição teórica da detecção eletroanalítica de resveratrol em vinhos e sucos, assistida pelo oxihidróxido de cobalto.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Storoshchuk, Nataliia M., Luganska, Olga V., Kopiika, Vira V., Novosad, Nataliia V., Lukanova, Svitlana M., Ivanushko, Yana G., Ostapchuk, Valentyna G., Melnychuk, Svitlana P., Yagodynets, Petro I., de Oliveira, Sílvio C., Ferrão de Paiva Martins, José I., de Mascarenhas Gaivão, Isabel O'Neill, Monteiro, Maria João, Kormosh, Zholt O., Garcia, Jarem R., da Silva Filho, Eloi A., and Vitriak, Oksana P.

Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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13. A descrição teórica da detecção eletroanalítica do ledol em méis, assistida pelo compósito do polímero condutor com o oxihidróxido de cobalto.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Storoshchuk, Nataliia M., Luganska, Olga V., Kopiika, Vira V., Novosad, Nataliia V., Lukanova, Svitlana M., Ivanushko, Yana G., Ostapchuk, Valentyna G., Melnychuk, Svitlana P., Yagodynets', Petro I., de Oliveira, Sílvio C., de Paiva Martins, José I. Ferrão, Monteiro, Maria João, Kormosh, Zholt O., and Morozova, Tetiana V.

Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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14. The theoretical description for omeprazole electrochemical determination, assisted by the composite poly(1,2,4-triazole)-Ag2O2

Author

V. Tkach, Volodymyr, primary, Kushnir, Marta V., additional, Ivanushko, Yana G., additional, G. Ostapchuk, Valentyna, additional, Melnychuk, Svitlana P., additional, de Oliveira, Sílvio C., additional, Parchenko, Volodymyr V., additional, Aksyonova, Ilona I., additional, Odyntsova, Vira M., additional, Yagodynets´, Petro I., additional, Kormosh, Zholt O., additional, and V. Luganska, Olga, additional

Published
2023
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15. The mathematical description of the electroanalytical determination of salvarsan drug and its cyclooligomers, assisted by the composite of squaraine dye with cobalt oxyhydroxide

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., de Oliveira, Sílvio C., dos Reis, Lucinda Vaz, Yagodynets', Petro I., and Kormosh, Zholt O.

Subjects
squaraine dye, electrochemical sensor, oscilações eletroquímicas, corante esquaraína, oscilaciones electroquímicas, estado estacionario estable, stable steady-state, cobalt oxyhydroxide, Salvarsan, colorante escuárico, electrochemical oscillations, sensor electroquímico, oxihidróxido de cobalto, Salvarsano, estado estacionário estável, sensor eletroquímico
Abstract

RESUMEN Objetivo: En este trabajo se realiza, por primera vez, la evaluación teórica de la posibilidad de la detección electroanalítica de salvarsano, fármaco antisifilítico. El oxihidróxido de cobalto, en su compuesto con el colorante escuárico, se usa como modificador de electrodo. Metodología: Mediante el análisis de estabilidad, se ha confirmado su eficiencia en los procesos de detección de salvarsano. La linearidad de dependencia entre el parámetro electroquímico y la concentración del fármaco se obtiene y se mantiene fácilmente. Conclusión: Las inestabilidades oscilatoria y monotónica se realizan en el sistema, causadas por las influencias de las etapas electroquímicas a las capacitancias de la doble capa eléctrica (DCE). SUMMARY Aim: In this work, the theoretical evaluation of the electroanalytical detection of antisyphilitic drug salvarsan is given for the first time. Cobalt oxyhydroxide in a composite with the squaraine dye is used as electrode modifier. Methodology: By means of the stability analysis the efficiency of the salvarsan determination is confirmed. The linearity of the dependence between the electrochemical parameter and drug concentration is easily obtained and maintained. Conclusion: The oscillatory and monotonic instabilities are realized in this system, being caused by the electrochemical stages' influences to the double electric layer (DEL). RESUMO Objetivo: neste trabalho, a avaliação teórica da detecção eletroanalítica do antissifilítico salvarsan é feita pela primeira vez. O oxihidróxido de cobalto em um composto com o corante esquaraína é usado como modificador de eletrodo. Metodologia: por meio da análise de estabilidade é confirmada a eficiência da determinação de salvarsan. A linearidade da dependência entre o parâmetro eletroquímico e a concentração do fármaco é facilmente obtida e mantida. Conclusão: as instabilidades osci-latórias e monotônicas são percebidas neste sistema, sendo causadas pelas influências dos estágios eletroquímicos sobre a dupla camada elétrica (DEL).

Published
2021

16. Descripción teórica de la detección electroquímica del fármaco pilocarpina, asistida por el compuesto de colorante escuárico con el oxihidróxido de vanadio (III).

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Sílvio C., Ivanushko, Yana G., Sykyrytska, Tetiana B., Biryuk, Igor G., Luganska, Olga V., Kopiika, Vira V., Domnich, Valerii I., Yagodynets, Petro I., Kormosh, Zholt O., Morozova, Tetiana V., I. F. Martins, José, and Vaz dos Reis, Lucinda

Subjects
MUSCARINIC agonists, MUSCARINIC receptors, ELECTRIC currents, PILOCARPINE, DETECTION limit, OPHTHALMIC drugs
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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17. A descrição matemática da detecção eletroanalítica da metaqualona, baseada na sua eletrooxidação sobre o compósito da poli(5-amino-1,4-naftoquinona) com o oxihidróxido de cobalto.

Author

Tkach, Volodymyr V., Kushnir, Marta V., C. de Oliveira, Sílvio, O. da Silva, Adriano, Ivanushko, Yana G., Banul, Bohdana Yu., Honchar, Tetiana V., Yagodynets, Petro I., Luganska, Olga V., Kormosh, Zholt O., I. F. Martins, José, Odyntsova, Vira M., Krasko, Mykola P., and Karakoyun, Necdet

Subjects
IONIC structure, STABILITY theory, BIFURCATION theory, MATHEMATICAL models, COBALT, OSCILLATING chemical reactions
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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18. The theoretical description for omeprazole electrochemical determination, assisted by the composite poly(1,2,4-triazole)-Ag2O2.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., Ostapchuk, Valentyna G., Melnychuk, Svitlana P., de Oliveira, Sílvio C., Parchenko, Volodymyr V., Aksyonova, Ilona I., Odyntsova, Vira M., Yagodynets', Petro I., Kormosh, Zholt O., and Luganska, Olga V.

Subjects
OMEPRAZOLE, STOMACH ulcers, DETECTION limit, ELECTROCHEMICAL sensors, CONDUCTING polymers, POLYMERS
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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19. Theoretical aspects of the electropolymerization of some hydroquinonic derivatives

Author

Yagodynets, Petro, Dytynchenko, Inna M., Lystvan, Vitalii V., Tkach, Volodymyr V., De Oliveira, Silvio C., Da Silva, Adriano O., Luganska, Olga, Kormosh, Zholt O., Akınay, Yüksel, and Kushnir, Marta

Subjects
Molecular Medicine, Molecular Biology, Biochemistry, Biotechnology
Abstract

© 2020, AMG Transcend Association. All rights reserved.For the first time, the possibility of the electrochemical synthesis and polymerization of some novel modified naphthoquinone compounds has been described. The correspondent mathematical model has been analyzed by means of linear stability theory and bifurcation analysis. It has been shown that the electro organic synthesis may serve as an interesting substitution for Suzuki reaction for the synthesis of ferrocenyl naphthoquinone and its polymer. The oscillatory and monotonic instability, in this case, will be more probable than in the general electropolymerization case.

Published
2021

20. The mathematical description for the ergin electrochemical detection, assisted by amavadin ion doped triazolic derivatives

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Sílvio C., Parchenko, Volodymyr V., Odyntsova, Vira M., Aksyonova, Ilona I., Ivanushko, Yana G., Yagodynets´, Petro I., Kormosh, Zholt O., Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Sílvio C., Parchenko, Volodymyr V., Odyntsova, Vira M., Aksyonova, Ilona I., Ivanushko, Yana G., Yagodynets´, Petro I., and Kormosh, Zholt O.

Abstract

Introduction: For the first time, the electroanalytical process of ergin (LSA) determinationover an electrode, modified by triazolic derivative, doped by an amavadin-ion,has been theoretically described. Methods: The mathematical model, correspondentto the sensor function, has been developed and analyzed by means of linear stabilitytheory. It has been shown that the amavadin may serve as an efficient electrode modifierfor the electroanalytical detection of ergin. Moreover, the presence of an organicmaterial as electrode modifier reinforces the possibility of ergin polymerization,yielding a polymer composite. Results: The oscillatory and monotonic behavior ismore probable than in the common case, considering the formation and destructionof the ionic compounds during the electroanalytical detection., Introducción: por primera vez se ha descrito teóricamente el proceso eletroanalíticode detección de ergina (LSA) en un electrodo, modificado por un derivado triazólico,dopado por el ión amavadina. Métodos: el modelo matemático, correspondienteal rendimiento del sensor, ha sido desarrollado y analizado desde el punto de vistade la teoría de la estabilidad lineal. Se ha demostrado que la amavadina puede servircomo un modificador eficaz para la detección eletroanalítica de ergina. Además, lapresencia de un material orgánico en el modificador refuerza la capacidad de la erginapara polimerizar, formando un compuesto polimérico. Resultados: los comportamientososcilatorios y monótonos son más probables que en el caso más común, dadala formación-deformación de compuestos iónicos durante la detección eletroanalítica., Introdução: pela primeira vez, o processo eletroanalítico da detecção da ergina (LSA)sobre um elétrodo, modificado por um derivado triazólico, dopado pelo íon amavadina,tem sido descrito teoricamente. Métodos: o modelo matemático, correspondenteao desempenho do sensor, tem sido desenvolvido e analisado do ponto de vista dateoria de estabilidade linear. Foi mostrado que a amavadina pode servir de modificadoreficiente para a detecção eletroanalítica da ergina. Outrossim, a presença de um materialorgânico no modificador reforça a capacidade da ergina de polimerizar-se, formandoum compósito polimérico. Resultados: os comportamentos oscilatório e monotônicosão mais prováveis que no caso mais comum, haja vista a formação-deformaçãode compostos iônicos aquando da detecção eletroanalítica.

Published
2021

24. THE 'POLYTHIOPHENE PARADOX'. A THEORETICAL SIGHT TO AN ALTERNATIVE SCENARIO

Author

Tkach, Volodymyr Valentynovych, Kushnir, Marta V., M. Dytynchenko, Inna, C. De Oliveira, Sílvio, V. Luganska, Olga, G. Ivanushko, Yana, Ye. Kovalchuk, Petro, I. Yagodynets´, Petro, and Zholt O. Kormosh, Zholt O. Kormosh

Subjects
Quantitative Biology::Biomolecules, polythiophene, electropolymerization, electrosynthetized monomers, polythiophene paradox, S-oxidation, stable steady-state
Abstract

The mathematical model for the polythiophene paradox for the polymerization of electrochemically synthetized monomers has been modified, in order to allow the description of an alternative polymer oxidation scenario. The analysis of the model, realized by means of the linear stability theory and bifurcation analysis, has confirmed that in the presence of two parallel oxidation reactions of the polymer, the oscillatory and monotonic instability will be more probable than in the simplest polythiophene paradox systems. The polymer morphology and themical properties will be affected. Nevertheless, the polythiophene, overoxidized in these conditions, may be efficiently deposed and used for electroanalytical and corrosion-protecting purposes., Applied Journal of Environmental Engineering Science, Vol 6, No 3 (2020): Vol6(3)2020

Published
2020
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25. The theoretical description for the electrochemical determination of 4-4´-dihydroxyazobenzene, assisted by a composite of squaraine dye with cobalt (iii) oxyhydroxide in pair with cobalt (iv) oxide

Author

Tkach, Volodymyr Valentynovych, primary, Kushnir, Marta V., additional, Ahafonova, Oleksandra V., additional, Mytchenok, Mariia P., additional, Bocharov, Andrii V., additional, Kovalchuk, Petro Ye., additional, De Oliveira, Sílvio C., additional, Yagodynets, Petro I., additional, Kormosh, Zholt O., additional, Dos Reis, Lucinda Vaz, additional, Bredikhina, Yulia L., additional, Ivanushko, Yana G., additional, and Nazymok, Yevgeniya V., additional

Published
2020
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27. Descripción teórica del desempeño electroanalítico del material compuesto de oxihidróxido de vanadio con el colorante escuárico en la detección de la carfedona.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., de Oliveira, Sílvio C., Vaz dos Reis, Lucinda, Yagodynets, Petro I., and Kormosh, Zholt O.

Subjects
ELECTRIC double layer, ELECTRIC capacity, STABILITY theory, BIFURCATION theory, VANADIUM dioxide, HYDROXIDES
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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28. A conversão eletrocatalítica de etanal em glioxal. Uma avaliação teórica.

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Sílvio C., Lukanova, Svitlana M., Ivanushko, Yana G., Lystvan, Vitalii V., Dytynchenko, Inna M., Yagodynets, Petro I., and Kormosh, Zholt O.

Subjects
ELECTRIC double layer, POLYMER electrodes, CHEMICAL systems, STABILITY theory, ACETALDEHYDE
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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29. The mathematical description for the process of the electrochemical detection of ascorbic acid over a conducting polymer, doped by a triiodide ion

Author

Tkach, Volodymyr V., Kushnir, Marta V., Oliveira, Sílvio C. de, Kormosh, Zholt O., Luganska, Olga V., Parchenko, Volodymyr V., Ivanushko, Yana G., and Yagodynets', Petró I.

Subjects
polímero condutor, triiode-to, sensores eletroquímicos, electrochemical sensors, Ascorbic acid, estado estacionário estável, electrooxidation, Ácido ascórbico, conducting polymer, triiodide, eletrooxidação, stable steady-state
Abstract

RESUMO O desempenho do polímero condutor, dopado pelo íon triiodeto, na detecção eletroquímica do ácido ascórbico foi avaliado matematicamente. O modelo matemático, correspondente ao sistema, foi desenvolvido e analisado mediante a teoria de estabilidade linear e de bifurcações. Verificou-se que o polímero condutor pode servir de excelente modificador de elétrodo para a detecção do ácido ascórbico, sendo o triiodeto a substância ativa, e o polímero condutor o mediador. O estado estacionário mantém-se estável facilmente, o que corresponde à vasta zona da linearidade da dependência entre a concentração do fármaco e o parâmetro eletroquímico. A possibilidade das instabilidades oscilatória e monotônica também foi verificada. SUMMARY The function of the conducting polymer, doped by triiodide ion in the electrochemical determination of the ascorbic acid has been mathematically evaluated. The mathematical model, correspondent to the system, was developed and analyzed by linear stability theory and bifurcation analysis. It was confirmed that the conducting polymer might be an excellent electrode modifier for ascorbic acid determination. The triiodide ion acts as the active substance, and the conducting polymer, as a mediator. The stable steady-state is easy maintain, which is correspondent to the vast zone of the linear dependence between the drug concentration and electrochemical parameter The possibility of oscillatory and monotonic instabilities has also been verified.

Published
2019

30. The mathematical description for the process of the electrochemical detection of ascorbic acid over a conducting polymer, doped by a triiodide ion

Author

Kushnir, Marta V., de Oliveira, Silvio C., Kormosh, Zholt O., Luganska, Olga V., Parchenko, Volodymyr V., Ivanushko, Yana G., Yagodynets´, Petró I., Kushnir, Marta V., de Oliveira, Silvio C., Kormosh, Zholt O., Luganska, Olga V., Parchenko, Volodymyr V., Ivanushko, Yana G., and Yagodynets´, Petró I.

Abstract

The function of the conducting polymer, doped by triiodide ion in the electrochemical determination of the ascorbic acid has been mathematically evaluated. The mathematical model, correspondent to the system, was developed and analyzed by linear stability theory and bifurcation analysis. It was confirmed that the conducting polymer might be an excellent electrode modifier for ascorbic acid determination. The triiodide ion acts as the active substance, and the conducting polymer, as a mediator. The stable steady-state is easy maintain, which is correspondent to the vast zone of the linear dependence between the drug concentration and electrochemical parameter The possibility of oscillatory and monotonic instabilities has also been verified., O desempenho do polímero condutor, dopado pelo íon triiodeto, na detecção eletroquímica do ácido ascórbico foi avaliado matematicamente. O modelo matemático, correspondente ao sistema, foi desenvolvido e analisado mediante a teoria de estabilidade linear e de bifurcações. Verificou-se que o polímero condutor pode servir de excelente modificador de elétrodo para a detecção do ácido ascórbico, sendo o triiodeto a substância ativa, e o polímero condutor o mediador. O estado estacionário mantém-se estável facilmente, o que corresponde à vasta zona da linearidade da dependência entre a concentração do fármaco e o parâmetro eletroquímico. A possibilidade das instabilidades oscilatória e monotônica também foi verificada.

Published
2019

31. A descrição teórica da detecção eletroquímica do fármaco olanzapina, assistida pelo compósito do oxihidróxido de cobalto (III) com um corante esquaraínico.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., De Oliveira, Sílvio C., Vaz dos Reis, Lucinda, Yagodynets', Petro I., Kormosh, Zholt O., Luganska, Olga V., Kopiika, Vira V., Novosad, Natalia V., and da Silva, Adriano O.

Subjects
COBALT compounds, POISONS, STABILITY theory, BIFURCATION theory, ANTIPSYCHOTIC agents, BENZODIAZEPINES
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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33. Descripción matemática de la determinación electroanalítica del fármaco salvarsano y su ciclooligómeros, asistida por un compuesto del colorante escuárico y oxihidróxido de cobalto.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., de Oliveira, Sílvio C., Vaz dos Reis, Lucinda, Yagodynets, Petro I., and Kormosh, Zholt O.

Subjects
ELECTRIC double layer, COBALT, ELECTROCHEMICAL sensors, ELECTRODES, DYES & dyeing
Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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34. The Theoretical Description for Ag2O2/Squaraine Dye -- Metformin Electrochemical Determination.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., Ostapchuk, Valentyna G., Melnychuk, Svitlana P., de Oliveira, Silvio C., Parchenko, Volodymyr V., Aksyonova, Ilona I., Odyntsova, Vira M., Yagodynets, Petro I., Kormosh, Zholt O., Luganska, Olga V., Vaz dos Reis, Lucinda, and Zavolovych, Alina Yo.

Subjects
ELECTRIC double layer, METFORMIN, STABILITY theory, BIFURCATION theory
Abstract

In this work, the electrochemical description for metformin electrochemical determination, assisted by Ag2O2 composite with squaraine dye, is evaluated from the theoretical point of view. Metformin oxidation is realized via assisted electrochemical 1,2,4-triazole formation, followed by its polymerization and N-oxidation. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It has shown that the neutral and basic media are more efficient for metformin electrochemical determination than acidic media, due to the absence of the influences of non-protonated aminogroupsand, furtherly, pyridinic nitrogen atoms to double electric layer (DEL) ionic force, conductivity and impedance. In these conditions, the electrochemical instabilities are less capable to realize and, therefore, the linear dependence between the analyte concentration and the current of the system will be easier to obtain and maintain, as no side reaction or additional process, capable to compromise the monomer and (or) modifier stability is realized. [ABSTRACT FROM AUTHOR]

Published
2020
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35. A descrição matemática do processo da detecção eletroquímica do ácido ascórbico sobre o polímero condutor, dopado pelo íon triiodeto.

Author

Tkach, Volodymyr V., Kushnir, Marta V., de Oliveira, Sílvio C., Kormosh, Zholt O., Luganska, Olga V., Parchenk, Volodymyr V., Ivanushko, Yana G., and Yagodynets, Petró I.

Abstract

Copyright of Revista Colombiana de Ciencias Químico-Farmacéuticas is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2019
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37. The theoretical description for omeprazole electrochemical determination, assisted by the composite poly(1,2,4-triazole)-Ag2O2.

Author

Tkach, Volodymyr V., Kushnir, Marta V., Ivanushko, Yana G., Ostapchuk, Valentyna G., Melnychuk, Svitlana P., de Oliveira, Sílvio C., Parchenko, Volodymyr V., Aksyonova, Ilona I., Odyntsova, Vira M., Yagodynets', Petro I., Kormosh, Zholt O., and Luganska, Olga V.

Subjects
*OMEPRAZOLE, *STOMACH ulcers, *DETECTION limit, *ELECTROCHEMICAL sensors, *CONDUCTING polymers, *POLYMERS
Abstract

Introduction: Omeprazole is one of the most used proton-blocking molecules applied in the gastric ulcer treatment. Its blocking effect is achieved by the presence of both acidic and basic nitrogen heteroatoms in its composition. Nevertheless, due to its collateral effects, which may be moderate to severe, the development of its electrochemical determination is really actual. Methods: In this work, we describe theoretically the possibility of omeprazole electrochemical determination, assisted by the composite, containing the silver (I, III) oxide as an active substance and the polymer of 1,2,4-triazolic derivative as a mediator. In this case, the omeprazole molecule is gradually oxidized yielding firstly phenolic and then quinonic derivative. The pyridinic nitrogen is oxidized later. Results: The electroanalytical process is described by a trivariant equation-set, analysis of which confirms the efficiency of the composite of poly(1,2,4-triazole) with Ag2O2. The electrochemical oscillations are also possible, being realized beyond the detection limit. Conclusion: The composite of poly(1,2,4-triazole) with Ag2O is suitable for omeprazole electrochemical determination both in vivo and in vitro. [ABSTRACT FROM AUTHOR]

Published
2022
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