TY  - JOUR
AU  - Haššo, Marek
AU  - Sarakhman, Olha
AU  - Đurđić, Slađana Z.
AU  - Stanković, Dalibor
AU  - Švorc, Ľubomír
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6263
AB  - In this work, an advanced electrochemical platform was developed for the simple, rapid and sensitive determination of the polyphenolic compound tannic acid in various beverages using the combination of batch injection analysis with amperometric detection on a screen-printed carbon electrode. Several experimental parameters (pH of supporting electrolyte, detection potential, dispensing rate, injected volume, stirring) were consistently evaluated. The most favorable analytical performance in terms of sensitivity, selectivity, repeatability and sampling frequency was obtained in Britton-Robinson buffer pH 5.0 at a detection potential of +0.6 V vs. Ag/AgCl, a dispensing rate of 204 µL/s and an injected volume of 80 µL under stirring condition (1500 r.p.m.). The presented platform has advantages for routine analysis including portable and small-scale experimental setup, low sample consumption (∼100 µL), simple sample preparation (dilution in supporting electrolyte), high sampling frequency (180 injections per hour), low limit of detection (80 nM) and suitable precision (RSD = 4.2% for 10 μM tannic acid, n = 20). The applicability of the method was verified by analyzing several beverage samples (tea, wine) in spike-recovery assay with the recovery values for tannic acid ranging from 94 to 101 %.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Advanced electrochemical platform for simple and rapid quantification of tannic acid in beverages using batch injection analysis with amperometric detection
VL  - 942
SP  - 117578
DO  - 10.1016/j.jelechem.2023.117578
ER  - 

@article{
author = "Haššo, Marek and Sarakhman, Olha and Đurđić, Slađana Z. and Stanković, Dalibor and Švorc, Ľubomír",
year = "2023",
abstract = "In this work, an advanced electrochemical platform was developed for the simple, rapid and sensitive determination of the polyphenolic compound tannic acid in various beverages using the combination of batch injection analysis with amperometric detection on a screen-printed carbon electrode. Several experimental parameters (pH of supporting electrolyte, detection potential, dispensing rate, injected volume, stirring) were consistently evaluated. The most favorable analytical performance in terms of sensitivity, selectivity, repeatability and sampling frequency was obtained in Britton-Robinson buffer pH 5.0 at a detection potential of +0.6 V vs. Ag/AgCl, a dispensing rate of 204 µL/s and an injected volume of 80 µL under stirring condition (1500 r.p.m.). The presented platform has advantages for routine analysis including portable and small-scale experimental setup, low sample consumption (∼100 µL), simple sample preparation (dilution in supporting electrolyte), high sampling frequency (180 injections per hour), low limit of detection (80 nM) and suitable precision (RSD = 4.2% for 10 μM tannic acid, n = 20). The applicability of the method was verified by analyzing several beverage samples (tea, wine) in spike-recovery assay with the recovery values for tannic acid ranging from 94 to 101 %.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Advanced electrochemical platform for simple and rapid quantification of tannic acid in beverages using batch injection analysis with amperometric detection",
volume = "942",
pages = "117578",
doi = "10.1016/j.jelechem.2023.117578"
}

Haššo, M., Sarakhman, O., Đurđić, S. Z., Stanković, D.,& Švorc, Ľ.. (2023). Advanced electrochemical platform for simple and rapid quantification of tannic acid in beverages using batch injection analysis with amperometric detection. in Journal of Electroanalytical Chemistry
Elsevier., 942, 117578.
https://doi.org/10.1016/j.jelechem.2023.117578

Haššo M, Sarakhman O, Đurđić SZ, Stanković D, Švorc Ľ. Advanced electrochemical platform for simple and rapid quantification of tannic acid in beverages using batch injection analysis with amperometric detection. in Journal of Electroanalytical Chemistry. 2023;942:117578.
doi:10.1016/j.jelechem.2023.117578 .

Haššo, Marek, Sarakhman, Olha, Đurđić, Slađana Z., Stanković, Dalibor, Švorc, Ľubomír, "Advanced electrochemical platform for simple and rapid quantification of tannic acid in beverages using batch injection analysis with amperometric detection" in Journal of Electroanalytical Chemistry, 942 (2023):117578,
https://doi.org/10.1016/j.jelechem.2023.117578 . .

TY  - JOUR
AU  - Sarakhman, Olha
AU  - Pysarevska, Solomiya
AU  - Dubenska, Liliya
AU  - Stanković, Dalibor
AU  - Otrisal, Pavel
AU  - Planková, Alexandra
AU  - Kianicková, Kristína
AU  - Šovrc, Ľubomír
PY  - 2019
AB  - In present paper, a miniaturized boron-doped diamond electrode (BDDE) was for the first time used as a reliable electrochemical sensor within the novel voltammetric protocol for the rapid and simple determination of dipyridamole (DIP). Cyclic voltammetric studies uncovered that the electrochemical oxidation of DIP was shown to be irreversible and diffusion-controlled process with single and well-developed signal at a potential of +0.45 V in Britton-Robinson buffer at pH 3.0. Using the suitable experimental conditions, the linearity for DIP determination was observed in the concentration ranges of 0.1.5.0 μM and 0.1.6.0 μM with the corresponding limits of detection of 40 nM and 60 nM as well as the intra-day repeatability with relative standard deviation below 5% for differential pulse and square-wave voltammetry, respectively. This protocol was successfully applied to the determination of DIP in pharmaceutical tablets with result in good compliance with that declared by the producer. Biological pertinence of the developed procedure was presented by analysis of model human urine samples with adequate recoveries. The proposed protocol with a miniaturized BDDE could represent an effective and alternative analytical implement for DIP determination instead of commonly used toxic mercury and chemically-modified electrodes in previously published methods.
PB  - Electrochemical Society Inc.
T2  - Journal of the Electrochemical Society
T1  - Voltammetric protocol for reliable determination of a platelet aggregation inhibitor dipyridamole on a bare miniaturized boron-doped diamond electrochemical sensor
VL  - 166
IS  - 4
SP  - B219
EP  - B226
DO  - 10.1149/2.0381904jes
ER  - 

@article{
author = "Sarakhman, Olha and Pysarevska, Solomiya and Dubenska, Liliya and Stanković, Dalibor and Otrisal, Pavel and Planková, Alexandra and Kianicková, Kristína and Šovrc, Ľubomír",
year = "2019",
abstract = "In present paper, a miniaturized boron-doped diamond electrode (BDDE) was for the first time used as a reliable electrochemical sensor within the novel voltammetric protocol for the rapid and simple determination of dipyridamole (DIP). Cyclic voltammetric studies uncovered that the electrochemical oxidation of DIP was shown to be irreversible and diffusion-controlled process with single and well-developed signal at a potential of +0.45 V in Britton-Robinson buffer at pH 3.0. Using the suitable experimental conditions, the linearity for DIP determination was observed in the concentration ranges of 0.1.5.0 μM and 0.1.6.0 μM with the corresponding limits of detection of 40 nM and 60 nM as well as the intra-day repeatability with relative standard deviation below 5% for differential pulse and square-wave voltammetry, respectively. This protocol was successfully applied to the determination of DIP in pharmaceutical tablets with result in good compliance with that declared by the producer. Biological pertinence of the developed procedure was presented by analysis of model human urine samples with adequate recoveries. The proposed protocol with a miniaturized BDDE could represent an effective and alternative analytical implement for DIP determination instead of commonly used toxic mercury and chemically-modified electrodes in previously published methods.",
publisher = "Electrochemical Society Inc.",
journal = "Journal of the Electrochemical Society",
title = "Voltammetric protocol for reliable determination of a platelet aggregation inhibitor dipyridamole on a bare miniaturized boron-doped diamond electrochemical sensor",
volume = "166",
number = "4",
pages = "B219-B226",
doi = "10.1149/2.0381904jes"
}

Sarakhman, O., Pysarevska, S., Dubenska, L., Stanković, D., Otrisal, P., Planková, A., Kianicková, K.,& Šovrc, Ľ.. (2019). Voltammetric protocol for reliable determination of a platelet aggregation inhibitor dipyridamole on a bare miniaturized boron-doped diamond electrochemical sensor. in Journal of the Electrochemical Society
Electrochemical Society Inc.., 166(4), B219-B226.
https://doi.org/10.1149/2.0381904jes

Sarakhman O, Pysarevska S, Dubenska L, Stanković D, Otrisal P, Planková A, Kianicková K, Šovrc Ľ. Voltammetric protocol for reliable determination of a platelet aggregation inhibitor dipyridamole on a bare miniaturized boron-doped diamond electrochemical sensor. in Journal of the Electrochemical Society. 2019;166(4):B219-B226.
doi:10.1149/2.0381904jes .

Sarakhman, Olha, Pysarevska, Solomiya, Dubenska, Liliya, Stanković, Dalibor, Otrisal, Pavel, Planková, Alexandra, Kianicková, Kristína, Šovrc, Ľubomír, "Voltammetric protocol for reliable determination of a platelet aggregation inhibitor dipyridamole on a bare miniaturized boron-doped diamond electrochemical sensor" in Journal of the Electrochemical Society, 166, no. 4 (2019):B219-B226,
https://doi.org/10.1149/2.0381904jes . .

TY  - JOUR
AU  - Šovrc, Ľubomír
AU  - Hasso, Marek
AU  - Sarakhman, Olha
AU  - Kianicková, Kristína
AU  - Stanković, Dalibor
AU  - Otrisal, Pavel
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2208
AB  - In the present paper, a miniaturized boron-doped diamond electrode (BDDE) is proposed as a progressive electrochemical sensor for simple, fast and reliable quantification of dimethylxanthine alkaloid, theobromine (TB). Using cyclic voltammetry, the studied xanthine provided one well-shaped, irreversible and diffusion-controlled oxidation peak at relatively high potentials (+ 1.2 V vs. Ag/AgCl/3 M KCl reference electrode) in the presence of 0.1 M H2SO4. After selection of suitable experimental conditions, the linear calibration curves for TB were obtained in the concentration range from 0.99 up to 54.5 mu M with the sensitivity of 0.07 mu A/mu M providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated voltammetric protocol yielded low detection limits of 0.42 and 0.51 mu M accompanied by adequate intra-day repeatability (relative standard deviation of 2.5 and 1.7%) using DPV and SWV procedure, respectively. The interference study revealed the reasonable selectivity when taking the target food samples into account. The practical applicability of the voltammetric protocol using a miniaturized BDDE was verified in the analysis of six commercially available brands of chocolate products with the determined mass percentages of TB ranging from 0.75 to 2.24% and from 0.69 to 2.15% using DPV and SWV procedure, respectively. The obtained results were also in a good agreement with those achieved by reference titration method with potentiometric indication. The progressive electrochemical sensor based on a miniaturized BDDE has appeared to be an attractive candidate for practical applications in food quality control. Besides, the proposed voltammetric protocol presents advantages when compared to others techniques (e.g. chromatography), concerning simplicity, cost, speed of analysis, waste generation (environmentally friendly) and samples pretreatment (only dilution in electrolyte solution prior to analysis).
PB  - Elsevier Science Bv, Amsterdam
T2  - Microchemical Journal
T1  - A progressive electrochemical sensor for food quality control: Reliable determination of theobromine in chocolate products using a miniaturized boron-doped diamond electrode
VL  - 142
SP  - 297
EP  - 304
DO  - 10.1016/j.microc.2018.07.007
ER  - 

@article{
author = "Šovrc, Ľubomír and Hasso, Marek and Sarakhman, Olha and Kianicková, Kristína and Stanković, Dalibor and Otrisal, Pavel",
year = "2018",
abstract = "In the present paper, a miniaturized boron-doped diamond electrode (BDDE) is proposed as a progressive electrochemical sensor for simple, fast and reliable quantification of dimethylxanthine alkaloid, theobromine (TB). Using cyclic voltammetry, the studied xanthine provided one well-shaped, irreversible and diffusion-controlled oxidation peak at relatively high potentials (+ 1.2 V vs. Ag/AgCl/3 M KCl reference electrode) in the presence of 0.1 M H2SO4. After selection of suitable experimental conditions, the linear calibration curves for TB were obtained in the concentration range from 0.99 up to 54.5 mu M with the sensitivity of 0.07 mu A/mu M providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated voltammetric protocol yielded low detection limits of 0.42 and 0.51 mu M accompanied by adequate intra-day repeatability (relative standard deviation of 2.5 and 1.7%) using DPV and SWV procedure, respectively. The interference study revealed the reasonable selectivity when taking the target food samples into account. The practical applicability of the voltammetric protocol using a miniaturized BDDE was verified in the analysis of six commercially available brands of chocolate products with the determined mass percentages of TB ranging from 0.75 to 2.24% and from 0.69 to 2.15% using DPV and SWV procedure, respectively. The obtained results were also in a good agreement with those achieved by reference titration method with potentiometric indication. The progressive electrochemical sensor based on a miniaturized BDDE has appeared to be an attractive candidate for practical applications in food quality control. Besides, the proposed voltammetric protocol presents advantages when compared to others techniques (e.g. chromatography), concerning simplicity, cost, speed of analysis, waste generation (environmentally friendly) and samples pretreatment (only dilution in electrolyte solution prior to analysis).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Microchemical Journal",
title = "A progressive electrochemical sensor for food quality control: Reliable determination of theobromine in chocolate products using a miniaturized boron-doped diamond electrode",
volume = "142",
pages = "297-304",
doi = "10.1016/j.microc.2018.07.007"
}

Šovrc, Ľ., Hasso, M., Sarakhman, O., Kianicková, K., Stanković, D.,& Otrisal, P.. (2018). A progressive electrochemical sensor for food quality control: Reliable determination of theobromine in chocolate products using a miniaturized boron-doped diamond electrode. in Microchemical Journal
Elsevier Science Bv, Amsterdam., 142, 297-304.
https://doi.org/10.1016/j.microc.2018.07.007

Šovrc Ľ, Hasso M, Sarakhman O, Kianicková K, Stanković D, Otrisal P. A progressive electrochemical sensor for food quality control: Reliable determination of theobromine in chocolate products using a miniaturized boron-doped diamond electrode. in Microchemical Journal. 2018;142:297-304.
doi:10.1016/j.microc.2018.07.007 .

Šovrc, Ľubomír, Hasso, Marek, Sarakhman, Olha, Kianicková, Kristína, Stanković, Dalibor, Otrisal, Pavel, "A progressive electrochemical sensor for food quality control: Reliable determination of theobromine in chocolate products using a miniaturized boron-doped diamond electrode" in Microchemical Journal, 142 (2018):297-304,
https://doi.org/10.1016/j.microc.2018.07.007 . .