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Abstract <p>Comparative investigation of potentiometric characteristics for coatings electropolymerized from phosphate buffer and the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic-acid-based buffer solutions or deep eutectic solvents, such as reline and mixture of citric acid, glucose and water is carried out. Both the effect of media acidity on the sensor potential and the potentiometric response reversibility are evaluated&#xa0;for all the coatings synthesized. The solid-contact potentiometric sensor array is developed for the determination of easily oxidizable organic compounds: hydroquinone, dopamine, quercetin, and ascorbic acid. Analytical characteristics of such easily oxidizable organic compounds are established. According to the media pH, the analytes can perform either as single-charged ions demonstrating the slopes approaching the Nernstian values or as reducing agents affecting polymer redox forms’ ratio in the modifying coatings. The coatings synthesized from deep eutectic solvents showed wider linear ranges of determined concentrations. Also, they had better sensitivity as compared with those electrodeposited from aqueous media. The solid&#xa0;contact potentiometric sensors were tested for analytes’ determination in real samples of cosmetics, pharmaceuticals, and biologically active additives with 92–107% recovery.</p>

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Comparative Characteristics of Coatings Electropolymerized from Aqueous Media and Deep Eutectic Solvents and Their Using in Potentiometric Sensors

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • G. I. Galimzyanova,
  • M. I. Sorvin,
  • R. V. Shamagsumova,
  • T. N. Krasnova,
  • A. V. Porfir’eva,
  • G. A. Evtyugin

摘要

Abstract

Comparative investigation of potentiometric characteristics for coatings electropolymerized from phosphate buffer and the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic-acid-based buffer solutions or deep eutectic solvents, such as reline and mixture of citric acid, glucose and water is carried out. Both the effect of media acidity on the sensor potential and the potentiometric response reversibility are evaluated for all the coatings synthesized. The solid-contact potentiometric sensor array is developed for the determination of easily oxidizable organic compounds: hydroquinone, dopamine, quercetin, and ascorbic acid. Analytical characteristics of such easily oxidizable organic compounds are established. According to the media pH, the analytes can perform either as single-charged ions demonstrating the slopes approaching the Nernstian values or as reducing agents affecting polymer redox forms’ ratio in the modifying coatings. The coatings synthesized from deep eutectic solvents showed wider linear ranges of determined concentrations. Also, they had better sensitivity as compared with those electrodeposited from aqueous media. The solid contact potentiometric sensors were tested for analytes’ determination in real samples of cosmetics, pharmaceuticals, and biologically active additives with 92–107% recovery.