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  - Strežova, Ivana
AU  - Kianicková, Kristína
AU  - Stanković, Dalibor
AU  - Otrisal, Pavel
AU  - Samphao, Anchalee
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2180
AB  - Herein, an advanced electroanalytical approach for the determination of ibuprofen based on the use of a bare and electrochemically untreated boron-doped diamond electrode is presented. Cyclic voltammetric study revealed that the electrode reaction of the analyte was manifested by the presence of well-shaped irreversible and diffusion-driven oxidation peak at very high potential (+1.75 V vs. Ag/AgCl/3 mol L-1 KCl reference electrode) in 1 mol L-1 perchloric acid. After optimization of experimental conditions, the peak current of ibuprofen was proportionally linear from 9.49 x 10(-7) to 6.69 x 10(-5) mol L-1 providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated electroanalytical protocol rendered low detection limits of 4.1 x 10(-7) and 9.3 x 10(-7 )mol L-1 in association with favourable intra day repeatability (relative standard deviation of 3.6 and 4.6%) using DPV and SWV procedures, respectively. The effect of interfering compounds such as ascorbic acid, dopamine, caffeine, uric acid and glucose on the current response of ibuprofen was explored in details. The usefulness of the proposed approach was verified in the analysis of a variety of commercial brands of pharmaceuticals and spiked human urine samples with the significant range of recovery percentages (for pharmaceuticals 99.8-107.5% and 99.8-105.0% by DPV and SWV, for urine 95-107% and 97-103% by DPV and SWV). Taking these features into account, the developed protocol may be exploited as a novel, simple and efficient tool in drug quality control analysis and analysis of biological samples. In addition, a bare and electrochemically untreated boron-doped diamond electrode may be applied as a progressive electrochemical sensor and helpful alternative to previously utilized electrochemical platforms in this field.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode
VL  - 822
SP  - 144
EP  - 152
DO  - 10.1016/j.jelechem.2018.05.026
ER  - 

@article{
author = "Šovrc, Ľubomír and Strežova, Ivana and Kianicková, Kristína and Stanković, Dalibor and Otrisal, Pavel and Samphao, Anchalee",
year = "2018",
abstract = "Herein, an advanced electroanalytical approach for the determination of ibuprofen based on the use of a bare and electrochemically untreated boron-doped diamond electrode is presented. Cyclic voltammetric study revealed that the electrode reaction of the analyte was manifested by the presence of well-shaped irreversible and diffusion-driven oxidation peak at very high potential (+1.75 V vs. Ag/AgCl/3 mol L-1 KCl reference electrode) in 1 mol L-1 perchloric acid. After optimization of experimental conditions, the peak current of ibuprofen was proportionally linear from 9.49 x 10(-7) to 6.69 x 10(-5) mol L-1 providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated electroanalytical protocol rendered low detection limits of 4.1 x 10(-7) and 9.3 x 10(-7 )mol L-1 in association with favourable intra day repeatability (relative standard deviation of 3.6 and 4.6%) using DPV and SWV procedures, respectively. The effect of interfering compounds such as ascorbic acid, dopamine, caffeine, uric acid and glucose on the current response of ibuprofen was explored in details. The usefulness of the proposed approach was verified in the analysis of a variety of commercial brands of pharmaceuticals and spiked human urine samples with the significant range of recovery percentages (for pharmaceuticals 99.8-107.5% and 99.8-105.0% by DPV and SWV, for urine 95-107% and 97-103% by DPV and SWV). Taking these features into account, the developed protocol may be exploited as a novel, simple and efficient tool in drug quality control analysis and analysis of biological samples. In addition, a bare and electrochemically untreated boron-doped diamond electrode may be applied as a progressive electrochemical sensor and helpful alternative to previously utilized electrochemical platforms in this field.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode",
volume = "822",
pages = "144-152",
doi = "10.1016/j.jelechem.2018.05.026"
}

Šovrc, Ľ., Strežova, I., Kianicková, K., Stanković, D., Otrisal, P.,& Samphao, A.. (2018). An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 822, 144-152.
https://doi.org/10.1016/j.jelechem.2018.05.026

Šovrc Ľ, Strežova I, Kianicková K, Stanković D, Otrisal P, Samphao A. An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode. in Journal of Electroanalytical Chemistry. 2018;822:144-152.
doi:10.1016/j.jelechem.2018.05.026 .

Šovrc, Ľubomír, Strežova, Ivana, Kianicková, Kristína, Stanković, Dalibor, Otrisal, Pavel, Samphao, Anchalee, "An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode" in Journal of Electroanalytical Chemistry, 822 (2018):144-152,
https://doi.org/10.1016/j.jelechem.2018.05.026 . .

TY  - JOUR
AU  - Šovrc, Ľubomír
AU  - Strežova, Ivana
AU  - Kianicková, Kristína
AU  - Stanković, Dalibor
AU  - Otrisal, Pavel
AU  - Samphao, Anchalee
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2938
AB  - Herein, an advanced electroanalytical approach for the determination of ibuprofen based on the use of a bare and electrochemically untreated boron-doped diamond electrode is presented. Cyclic voltammetric study revealed that the electrode reaction of the analyte was manifested by the presence of well-shaped irreversible and diffusion-driven oxidation peak at very high potential (+1.75 V vs. Ag/AgCl/3 mol L-1 KCl reference electrode) in 1 mol L-1 perchloric acid. After optimization of experimental conditions, the peak current of ibuprofen was proportionally linear from 9.49 x 10(-7) to 6.69 x 10(-5) mol L-1 providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated electroanalytical protocol rendered low detection limits of 4.1 x 10(-7) and 9.3 x 10(-7 )mol L-1 in association with favourable intra day repeatability (relative standard deviation of 3.6 and 4.6%) using DPV and SWV procedures, respectively. The effect of interfering compounds such as ascorbic acid, dopamine, caffeine, uric acid and glucose on the current response of ibuprofen was explored in details. The usefulness of the proposed approach was verified in the analysis of a variety of commercial brands of pharmaceuticals and spiked human urine samples with the significant range of recovery percentages (for pharmaceuticals 99.8-107.5% and 99.8-105.0% by DPV and SWV, for urine 95-107% and 97-103% by DPV and SWV). Taking these features into account, the developed protocol may be exploited as a novel, simple and efficient tool in drug quality control analysis and analysis of biological samples. In addition, a bare and electrochemically untreated boron-doped diamond electrode may be applied as a progressive electrochemical sensor and helpful alternative to previously utilized electrochemical platforms in this field.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode
VL  - 822
SP  - 144
EP  - 152
DO  - 10.1016/j.jelechem.2018.05.026
ER  - 

@article{
author = "Šovrc, Ľubomír and Strežova, Ivana and Kianicková, Kristína and Stanković, Dalibor and Otrisal, Pavel and Samphao, Anchalee",
year = "2018",
abstract = "Herein, an advanced electroanalytical approach for the determination of ibuprofen based on the use of a bare and electrochemically untreated boron-doped diamond electrode is presented. Cyclic voltammetric study revealed that the electrode reaction of the analyte was manifested by the presence of well-shaped irreversible and diffusion-driven oxidation peak at very high potential (+1.75 V vs. Ag/AgCl/3 mol L-1 KCl reference electrode) in 1 mol L-1 perchloric acid. After optimization of experimental conditions, the peak current of ibuprofen was proportionally linear from 9.49 x 10(-7) to 6.69 x 10(-5) mol L-1 providing both differential pulse (DPV) and square-wave voltammetric (SWV) techniques, respectively. The elaborated electroanalytical protocol rendered low detection limits of 4.1 x 10(-7) and 9.3 x 10(-7 )mol L-1 in association with favourable intra day repeatability (relative standard deviation of 3.6 and 4.6%) using DPV and SWV procedures, respectively. The effect of interfering compounds such as ascorbic acid, dopamine, caffeine, uric acid and glucose on the current response of ibuprofen was explored in details. The usefulness of the proposed approach was verified in the analysis of a variety of commercial brands of pharmaceuticals and spiked human urine samples with the significant range of recovery percentages (for pharmaceuticals 99.8-107.5% and 99.8-105.0% by DPV and SWV, for urine 95-107% and 97-103% by DPV and SWV). Taking these features into account, the developed protocol may be exploited as a novel, simple and efficient tool in drug quality control analysis and analysis of biological samples. In addition, a bare and electrochemically untreated boron-doped diamond electrode may be applied as a progressive electrochemical sensor and helpful alternative to previously utilized electrochemical platforms in this field.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode",
volume = "822",
pages = "144-152",
doi = "10.1016/j.jelechem.2018.05.026"
}

Šovrc, Ľ., Strežova, I., Kianicková, K., Stanković, D., Otrisal, P.,& Samphao, A.. (2018). An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 822, 144-152.
https://doi.org/10.1016/j.jelechem.2018.05.026

Šovrc Ľ, Strežova I, Kianicková K, Stanković D, Otrisal P, Samphao A. An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode. in Journal of Electroanalytical Chemistry. 2018;822:144-152.
doi:10.1016/j.jelechem.2018.05.026 .

Šovrc, Ľubomír, Strežova, Ivana, Kianicková, Kristína, Stanković, Dalibor, Otrisal, Pavel, Samphao, Anchalee, "An advanced approach for electrochemical sensing of ibuprofen in pharmaceuticals and human urine samples using a bare boron-doped diamond electrode" in Journal of Electroanalytical Chemistry, 822 (2018):144-152,
https://doi.org/10.1016/j.jelechem.2018.05.026 . .

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 . .