TY  - JOUR
AU  - Butmee, P.
AU  - Tumcharern, G.
AU  - Saejueng, P.
AU  - Stanković, Dalibor
AU  - Ortner, Astrid
AU  - Jitcharoen, J.
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2805
AB  - A simple electrochemical sensor for bisphenol A (BPA) was developed based on a composite of graphene nanoplatelets (GNPs) and 1-butyl-2, 3-dimethylimidazolium tetrafluoroborate (ionic liquid, IL) as a modifier for glassy carbon paste electrodes (GCPEs). Scanning electron (SEM) and atomic force microscopy (AFM) were employed to characterize the morphology and surface modification. The electrochemical behavior of BPA on IL-GNP/GCPEs was investigated and the results showed that IL-GNP composites enhance the electrochemical signal toward BPA due to the synergetic effect of GNPs and IL. The experimental parameters including the amount of IL and GNPs, pH of solution, pulse potential, step potential, and scan rate were optimized. Under optimal conditions, the proposed sensor exhibited a linear relationship between signal and BPA concentrations ranging from 0.02–5.0 μM, with detection and quantification limits of 6.4 nM and 0.02 μM respectively. Moreover, the electrochemical sensor showed good repeatability (RSD = 3.3%, n = 5 measurements), good reproducibility (RSD = 3.8%, n = 5 sensors), high accuracy of 95.3–104.5% recovery, acceptable selectivity, and stability. The sensor was successfully applied to the determination of BPA in water samples in contact with plastic materials. The results were satisfactory and in agreement with reference values from a standard HPLC method.
T2  - Journal of Electroanalytical Chemistry
T1  - A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A
VL  - 833
SP  - 370
EP  - 379
DO  - 10.1016/j.jelechem.2018.12.014
ER  - 

@article{
author = "Butmee, P. and Tumcharern, G. and Saejueng, P. and Stanković, Dalibor and Ortner, Astrid and Jitcharoen, J. and Kalcher, Kurt and Samphao, Anchalee",
year = "2019",
abstract = "A simple electrochemical sensor for bisphenol A (BPA) was developed based on a composite of graphene nanoplatelets (GNPs) and 1-butyl-2, 3-dimethylimidazolium tetrafluoroborate (ionic liquid, IL) as a modifier for glassy carbon paste electrodes (GCPEs). Scanning electron (SEM) and atomic force microscopy (AFM) were employed to characterize the morphology and surface modification. The electrochemical behavior of BPA on IL-GNP/GCPEs was investigated and the results showed that IL-GNP composites enhance the electrochemical signal toward BPA due to the synergetic effect of GNPs and IL. The experimental parameters including the amount of IL and GNPs, pH of solution, pulse potential, step potential, and scan rate were optimized. Under optimal conditions, the proposed sensor exhibited a linear relationship between signal and BPA concentrations ranging from 0.02–5.0 μM, with detection and quantification limits of 6.4 nM and 0.02 μM respectively. Moreover, the electrochemical sensor showed good repeatability (RSD = 3.3%, n = 5 measurements), good reproducibility (RSD = 3.8%, n = 5 sensors), high accuracy of 95.3–104.5% recovery, acceptable selectivity, and stability. The sensor was successfully applied to the determination of BPA in water samples in contact with plastic materials. The results were satisfactory and in agreement with reference values from a standard HPLC method.",
journal = "Journal of Electroanalytical Chemistry",
title = "A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A",
volume = "833",
pages = "370-379",
doi = "10.1016/j.jelechem.2018.12.014"
}

Butmee, P., Tumcharern, G., Saejueng, P., Stanković, D., Ortner, A., Jitcharoen, J., Kalcher, K.,& Samphao, A.. (2019). A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A. in Journal of Electroanalytical Chemistry, 833, 370-379.
https://doi.org/10.1016/j.jelechem.2018.12.014

Butmee P, Tumcharern G, Saejueng P, Stanković D, Ortner A, Jitcharoen J, Kalcher K, Samphao A. A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A. in Journal of Electroanalytical Chemistry. 2019;833:370-379.
doi:10.1016/j.jelechem.2018.12.014 .

Butmee, P., Tumcharern, G., Saejueng, P., Stanković, Dalibor, Ortner, Astrid, Jitcharoen, J., Kalcher, Kurt, Samphao, Anchalee, "A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A" in Journal of Electroanalytical Chemistry, 833 (2019):370-379,
https://doi.org/10.1016/j.jelechem.2018.12.014 . .

TY  - JOUR
AU  - Butmee, P.
AU  - Tumcharern, G.
AU  - Saejueng, P.
AU  - Stanković, Dalibor
AU  - Ortner, Astrid
AU  - Jitcharoen, J.
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2805
AB  - A simple electrochemical sensor for bisphenol A (BPA) was developed based on a composite of graphene nanoplatelets (GNPs) and 1-butyl-2, 3-dimethylimidazolium tetrafluoroborate (ionic liquid, IL) as a modifier for glassy carbon paste electrodes (GCPEs). Scanning electron (SEM) and atomic force microscopy (AFM) were employed to characterize the morphology and surface modification. The electrochemical behavior of BPA on IL-GNP/GCPEs was investigated and the results showed that IL-GNP composites enhance the electrochemical signal toward BPA due to the synergetic effect of GNPs and IL. The experimental parameters including the amount of IL and GNPs, pH of solution, pulse potential, step potential, and scan rate were optimized. Under optimal conditions, the proposed sensor exhibited a linear relationship between signal and BPA concentrations ranging from 0.02–5.0 μM, with detection and quantification limits of 6.4 nM and 0.02 μM respectively. Moreover, the electrochemical sensor showed good repeatability (RSD = 3.3%, n = 5 measurements), good reproducibility (RSD = 3.8%, n = 5 sensors), high accuracy of 95.3–104.5% recovery, acceptable selectivity, and stability. The sensor was successfully applied to the determination of BPA in water samples in contact with plastic materials. The results were satisfactory and in agreement with reference values from a standard HPLC method.
T2  - Journal of Electroanalytical Chemistry
T1  - A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A
VL  - 833
SP  - 370
EP  - 379
EP  - M21~
DO  - 10.1016/j.jelechem.2018.12.014
ER  - 

@article{
author = "Butmee, P. and Tumcharern, G. and Saejueng, P. and Stanković, Dalibor and Ortner, Astrid and Jitcharoen, J. and Kalcher, Kurt and Samphao, Anchalee",
year = "2019",
abstract = "A simple electrochemical sensor for bisphenol A (BPA) was developed based on a composite of graphene nanoplatelets (GNPs) and 1-butyl-2, 3-dimethylimidazolium tetrafluoroborate (ionic liquid, IL) as a modifier for glassy carbon paste electrodes (GCPEs). Scanning electron (SEM) and atomic force microscopy (AFM) were employed to characterize the morphology and surface modification. The electrochemical behavior of BPA on IL-GNP/GCPEs was investigated and the results showed that IL-GNP composites enhance the electrochemical signal toward BPA due to the synergetic effect of GNPs and IL. The experimental parameters including the amount of IL and GNPs, pH of solution, pulse potential, step potential, and scan rate were optimized. Under optimal conditions, the proposed sensor exhibited a linear relationship between signal and BPA concentrations ranging from 0.02–5.0 μM, with detection and quantification limits of 6.4 nM and 0.02 μM respectively. Moreover, the electrochemical sensor showed good repeatability (RSD = 3.3%, n = 5 measurements), good reproducibility (RSD = 3.8%, n = 5 sensors), high accuracy of 95.3–104.5% recovery, acceptable selectivity, and stability. The sensor was successfully applied to the determination of BPA in water samples in contact with plastic materials. The results were satisfactory and in agreement with reference values from a standard HPLC method.",
journal = "Journal of Electroanalytical Chemistry",
title = "A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A",
volume = "833",
pages = "370-379-M21~",
doi = "10.1016/j.jelechem.2018.12.014"
}

Butmee, P., Tumcharern, G., Saejueng, P., Stanković, D., Ortner, A., Jitcharoen, J., Kalcher, K.,& Samphao, A.. (2019). A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A. in Journal of Electroanalytical Chemistry, 833, 370-379.
https://doi.org/10.1016/j.jelechem.2018.12.014

Butmee P, Tumcharern G, Saejueng P, Stanković D, Ortner A, Jitcharoen J, Kalcher K, Samphao A. A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A. in Journal of Electroanalytical Chemistry. 2019;833:370-379.
doi:10.1016/j.jelechem.2018.12.014 .

Butmee, P., Tumcharern, G., Saejueng, P., Stanković, Dalibor, Ortner, Astrid, Jitcharoen, J., Kalcher, Kurt, Samphao, Anchalee, "A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A" in Journal of Electroanalytical Chemistry, 833 (2019):370-379,
https://doi.org/10.1016/j.jelechem.2018.12.014 . .

TY  - JOUR
AU  - Kunpatee, Kanjana
AU  - Chamsai, Phuktra
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Ortner, Astrid
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3821
AB  - A sensitive and rapid method for the determination of fenobucarb by using screen-printed carbon electrode modified with graphene nanoribbons - ionic liquid - cobalt phthalocyanine (GNRs-IL-CoPc/SPCE) composites based on flow injection analysis (FIA) was developed and applied to vegetable samples. The prepared GNRs-IL-CoPc composite was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Moreover, cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical behavior of the modified SPCE. The amperometric current responses were obtained from the oxidation of 2-sec-butyl-phenol, which is the product of alkaline hydrolysis of fenobucarb. The optimization of chemical variables and instrumental analysis such as composite amounts, pH, applied potential, and flow rate were carried out to obtain the best measurement. Under the optimal conditions, the proposed sensor yielded sensitivity of 0.0884 M/A·cm2, a wide linear range for detection of fenobucarb from 0.025 to 110 μM with a low detection, and quantification limits of 0.0089 μM and 0.0252 μM, respectively. Additionally, the developed sensor showed good repeatability (RSD = 3.5%, n = 10 measurements) and good reproducibility (RSD = 3.9%, n = 5 sensors). The proposed method could be effectively applied for the determination of fenobucarb in vegetable samples.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis
VL  - 855
SP  - 113630
DO  - 10.1016/j.jelechem.2019.113630
ER  - 

@article{
author = "Kunpatee, Kanjana and Chamsai, Phuktra and Mehmeti, Eda and Stanković, Dalibor and Ortner, Astrid and Kalcher, Kurt and Samphao, Anchalee",
year = "2019",
abstract = "A sensitive and rapid method for the determination of fenobucarb by using screen-printed carbon electrode modified with graphene nanoribbons - ionic liquid - cobalt phthalocyanine (GNRs-IL-CoPc/SPCE) composites based on flow injection analysis (FIA) was developed and applied to vegetable samples. The prepared GNRs-IL-CoPc composite was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Moreover, cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical behavior of the modified SPCE. The amperometric current responses were obtained from the oxidation of 2-sec-butyl-phenol, which is the product of alkaline hydrolysis of fenobucarb. The optimization of chemical variables and instrumental analysis such as composite amounts, pH, applied potential, and flow rate were carried out to obtain the best measurement. Under the optimal conditions, the proposed sensor yielded sensitivity of 0.0884 M/A·cm2, a wide linear range for detection of fenobucarb from 0.025 to 110 μM with a low detection, and quantification limits of 0.0089 μM and 0.0252 μM, respectively. Additionally, the developed sensor showed good repeatability (RSD = 3.5%, n = 10 measurements) and good reproducibility (RSD = 3.9%, n = 5 sensors). The proposed method could be effectively applied for the determination of fenobucarb in vegetable samples.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis",
volume = "855",
pages = "113630",
doi = "10.1016/j.jelechem.2019.113630"
}

Kunpatee, K., Chamsai, P., Mehmeti, E., Stanković, D., Ortner, A., Kalcher, K.,& Samphao, A.. (2019). A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis. in Journal of Electroanalytical Chemistry
Elsevier., 855, 113630.
https://doi.org/10.1016/j.jelechem.2019.113630

Kunpatee K, Chamsai P, Mehmeti E, Stanković D, Ortner A, Kalcher K, Samphao A. A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis. in Journal of Electroanalytical Chemistry. 2019;855:113630.
doi:10.1016/j.jelechem.2019.113630 .

Kunpatee, Kanjana, Chamsai, Phuktra, Mehmeti, Eda, Stanković, Dalibor, Ortner, Astrid, Kalcher, Kurt, Samphao, Anchalee, "A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis" in Journal of Electroanalytical Chemistry, 855 (2019):113630,
https://doi.org/10.1016/j.jelechem.2019.113630 . .

TY  - JOUR
AU  - Vukojević, Vesna
AU  - Đurđić, Slađana Z.
AU  - Ognjanović, Miloš
AU  - Fabian, Martin
AU  - Samphao, Anchalee
AU  - Kalcher, Kurt
AU  - Stanković, Dalibor
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2987
AB  - A disposable glucose biosensor was prepared using nanoparticles of MnO2 decorated on graphene nanoribbons by surface modification with drop coating with the GOx and Nafion (R). Tested material was synthesized and characterized using several techniques. The biosensor could be operated under physiological conditions (0.1 M phosphate buffer, pH 7.4) and exhibited good reproducibility and stability. The linear range for the amperometric response of the biosensor at operating potential of +0.50 (versus Ag/AgCl) was from 0.1 to 1.4 mmol/l, with a detection limit of 0.05 mmol/l and high sensitivity of 56.32 mu A/mmol cm(2). Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons
VL  - 823
SP  - 610
EP  - 616
DO  - 10.1016/j.jelechem.2018.07.013
ER  - 

@article{
author = "Vukojević, Vesna and Đurđić, Slađana Z. and Ognjanović, Miloš and Fabian, Martin and Samphao, Anchalee and Kalcher, Kurt and Stanković, Dalibor",
year = "2018",
abstract = "A disposable glucose biosensor was prepared using nanoparticles of MnO2 decorated on graphene nanoribbons by surface modification with drop coating with the GOx and Nafion (R). Tested material was synthesized and characterized using several techniques. The biosensor could be operated under physiological conditions (0.1 M phosphate buffer, pH 7.4) and exhibited good reproducibility and stability. The linear range for the amperometric response of the biosensor at operating potential of +0.50 (versus Ag/AgCl) was from 0.1 to 1.4 mmol/l, with a detection limit of 0.05 mmol/l and high sensitivity of 56.32 mu A/mmol cm(2). Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons",
volume = "823",
pages = "610-616",
doi = "10.1016/j.jelechem.2018.07.013"
}

Vukojević, V., Đurđić, S. Z., Ognjanović, M., Fabian, M., Samphao, A., Kalcher, K.,& Stanković, D.. (2018). Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 823, 610-616.
https://doi.org/10.1016/j.jelechem.2018.07.013

Vukojević V, Đurđić SZ, Ognjanović M, Fabian M, Samphao A, Kalcher K, Stanković D. Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons. in Journal of Electroanalytical Chemistry. 2018;823:610-616.
doi:10.1016/j.jelechem.2018.07.013 .

Vukojević, Vesna, Đurđić, Slađana Z., Ognjanović, Miloš, Fabian, Martin, Samphao, Anchalee, Kalcher, Kurt, Stanković, Dalibor, "Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons" in Journal of Electroanalytical Chemistry, 823 (2018):610-616,
https://doi.org/10.1016/j.jelechem.2018.07.013 . .

TY  - DATA
AU  - Vukojević, Vesna
AU  - Đurđić, Slađana Z.
AU  - Ognjanović, Miloš
AU  - Fabian, Martin
AU  - Samphao, Anchalee
AU  - Kalcher, Kurt
AU  - Stanković, Dalibor
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2988
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Supplementary material for the article: Vukojević, V.; Djurdjić, S.; Ognjanović, M.; Fabián, M.; Samphao, A.; Kalcher, K.; Stanković, D. M. Enzymatic Glucose Biosensor Based on Manganese Dioxide Nanoparticles Decorated on Graphene Nanoribbons. Journal of Electroanalytical Chemistry 2018, 823, 610–616. https://doi.org/10.1016/j.jelechem.2018.07.013
UR  - https://hdl.handle.net/21.15107/rcub_cherry_2988
ER  - 

@misc{
author = "Vukojević, Vesna and Đurđić, Slađana Z. and Ognjanović, Miloš and Fabian, Martin and Samphao, Anchalee and Kalcher, Kurt and Stanković, Dalibor",
year = "2018",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Supplementary material for the article: Vukojević, V.; Djurdjić, S.; Ognjanović, M.; Fabián, M.; Samphao, A.; Kalcher, K.; Stanković, D. M. Enzymatic Glucose Biosensor Based on Manganese Dioxide Nanoparticles Decorated on Graphene Nanoribbons. Journal of Electroanalytical Chemistry 2018, 823, 610–616. https://doi.org/10.1016/j.jelechem.2018.07.013",
url = "https://hdl.handle.net/21.15107/rcub_cherry_2988"
}

Vukojević, V., Đurđić, S. Z., Ognjanović, M., Fabian, M., Samphao, A., Kalcher, K.,& Stanković, D.. (2018). Supplementary material for the article: Vukojević, V.; Djurdjić, S.; Ognjanović, M.; Fabián, M.; Samphao, A.; Kalcher, K.; Stanković, D. M. Enzymatic Glucose Biosensor Based on Manganese Dioxide Nanoparticles Decorated on Graphene Nanoribbons. Journal of Electroanalytical Chemistry 2018, 823, 610–616. https://doi.org/10.1016/j.jelechem.2018.07.013. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne..
https://hdl.handle.net/21.15107/rcub_cherry_2988

Vukojević V, Đurđić SZ, Ognjanović M, Fabian M, Samphao A, Kalcher K, Stanković D. Supplementary material for the article: Vukojević, V.; Djurdjić, S.; Ognjanović, M.; Fabián, M.; Samphao, A.; Kalcher, K.; Stanković, D. M. Enzymatic Glucose Biosensor Based on Manganese Dioxide Nanoparticles Decorated on Graphene Nanoribbons. Journal of Electroanalytical Chemistry 2018, 823, 610–616. https://doi.org/10.1016/j.jelechem.2018.07.013. in Journal of Electroanalytical Chemistry. 2018;.
https://hdl.handle.net/21.15107/rcub_cherry_2988 .

Vukojević, Vesna, Đurđić, Slađana Z., Ognjanović, Miloš, Fabian, Martin, Samphao, Anchalee, Kalcher, Kurt, Stanković, Dalibor, "Supplementary material for the article: Vukojević, V.; Djurdjić, S.; Ognjanović, M.; Fabián, M.; Samphao, A.; Kalcher, K.; Stanković, D. M. Enzymatic Glucose Biosensor Based on Manganese Dioxide Nanoparticles Decorated on Graphene Nanoribbons. Journal of Electroanalytical Chemistry 2018, 823, 610–616. https://doi.org/10.1016/j.jelechem.2018.07.013" in Journal of Electroanalytical Chemistry (2018),
https://hdl.handle.net/21.15107/rcub_cherry_2988 .

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  - Vukojević, Vesna
AU  - Đurđić, Slađana Z.
AU  - Ognjanović, Miloš
AU  - Fabian, Martin
AU  - Samphao, Anchalee
AU  - Kalcher, Kurt
AU  - Stanković, Dalibor
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2214
AB  - A disposable glucose biosensor was prepared using nanoparticles of MnO2 decorated on graphene nanoribbons by surface modification with drop coating with the GOx and Nafion (R). Tested material was synthesized and characterized using several techniques. The biosensor could be operated under physiological conditions (0.1 M phosphate buffer, pH 7.4) and exhibited good reproducibility and stability. The linear range for the amperometric response of the biosensor at operating potential of +0.50 (versus Ag/AgCl) was from 0.1 to 1.4 mmol/l, with a detection limit of 0.05 mmol/l and high sensitivity of 56.32 mu A/mmol cm(2). Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons
VL  - 823
SP  - 610
EP  - 616
DO  - 10.1016/j.jelechem.2018.07.013
ER  - 

@article{
author = "Vukojević, Vesna and Đurđić, Slađana Z. and Ognjanović, Miloš and Fabian, Martin and Samphao, Anchalee and Kalcher, Kurt and Stanković, Dalibor",
year = "2018",
abstract = "A disposable glucose biosensor was prepared using nanoparticles of MnO2 decorated on graphene nanoribbons by surface modification with drop coating with the GOx and Nafion (R). Tested material was synthesized and characterized using several techniques. The biosensor could be operated under physiological conditions (0.1 M phosphate buffer, pH 7.4) and exhibited good reproducibility and stability. The linear range for the amperometric response of the biosensor at operating potential of +0.50 (versus Ag/AgCl) was from 0.1 to 1.4 mmol/l, with a detection limit of 0.05 mmol/l and high sensitivity of 56.32 mu A/mmol cm(2). Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons",
volume = "823",
pages = "610-616",
doi = "10.1016/j.jelechem.2018.07.013"
}

Vukojević, V., Đurđić, S. Z., Ognjanović, M., Fabian, M., Samphao, A., Kalcher, K.,& Stanković, D.. (2018). Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 823, 610-616.
https://doi.org/10.1016/j.jelechem.2018.07.013

Vukojević V, Đurđić SZ, Ognjanović M, Fabian M, Samphao A, Kalcher K, Stanković D. Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons. in Journal of Electroanalytical Chemistry. 2018;823:610-616.
doi:10.1016/j.jelechem.2018.07.013 .

Vukojević, Vesna, Đurđić, Slađana Z., Ognjanović, Miloš, Fabian, Martin, Samphao, Anchalee, Kalcher, Kurt, Stanković, Dalibor, "Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons" in Journal of Electroanalytical Chemistry, 823 (2018):610-616,
https://doi.org/10.1016/j.jelechem.2018.07.013 . .

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  - Stanković, Dalibor
AU  - Samphao, Anchalee
AU  - Dojčinović, Biljana P.
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2353
AB  - This work presents the electrochemical behavior of levodopa (L-DOPA), at boron-doped diamond (BDD) electrodes, using cycling voltammetry (CV), in Britton-Robinson (BR) buffer solution, and application of the proposed electrode for the determination of L-DOPA in extracts from the seeds of velvet bean (Mucuna prurita Hook or Mucuna pruriens (L.) DC.). L-DOPA provides a well-defined and single oval-shape oxidation peak at +0.8 V vs. Ag/AgCl (3 M KCl) reference electrode in BR buffer solution at pH 3.0. Experimental parameters, such as pH of supporting electrolyte and square wave voltammetry (SWV) operating parameters (frequency and modulation amplitude) were optimized. The effect of possible interferences was evaluated. Under optimal conditions the detection limit of the developed method was 0.8 mu M and the calibration curve for L-DOPA was linear in the range from 2 to 100 mu M. The proposed method was successfully applied to the determination of L-DOPA in an extract from the seeds of Mucuna prurita. The obtained result was in good agreement with obtained by photometry with 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS). The developed approach can be beneficial for the quantification of L-DOPA using a BDD electrode as up-to-date potential alternative sensor for electroanalytical applications.
PB  - Slovensko Kemijsko Drustvo, Ljubljana
T2  - Acta Chimica Slovenica
T1  - Rapid Electrochemical Method for the Determination of L-DOPA in Extract From the Seeds of Mucuna Prurita
VL  - 63
IS  - 2
SP  - 220
EP  - 226
DO  - 10.17344/acsi.2015.1541
ER  - 

@article{
author = "Stanković, Dalibor and Samphao, Anchalee and Dojčinović, Biljana P. and Kalcher, Kurt",
year = "2016",
abstract = "This work presents the electrochemical behavior of levodopa (L-DOPA), at boron-doped diamond (BDD) electrodes, using cycling voltammetry (CV), in Britton-Robinson (BR) buffer solution, and application of the proposed electrode for the determination of L-DOPA in extracts from the seeds of velvet bean (Mucuna prurita Hook or Mucuna pruriens (L.) DC.). L-DOPA provides a well-defined and single oval-shape oxidation peak at +0.8 V vs. Ag/AgCl (3 M KCl) reference electrode in BR buffer solution at pH 3.0. Experimental parameters, such as pH of supporting electrolyte and square wave voltammetry (SWV) operating parameters (frequency and modulation amplitude) were optimized. The effect of possible interferences was evaluated. Under optimal conditions the detection limit of the developed method was 0.8 mu M and the calibration curve for L-DOPA was linear in the range from 2 to 100 mu M. The proposed method was successfully applied to the determination of L-DOPA in an extract from the seeds of Mucuna prurita. The obtained result was in good agreement with obtained by photometry with 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS). The developed approach can be beneficial for the quantification of L-DOPA using a BDD electrode as up-to-date potential alternative sensor for electroanalytical applications.",
publisher = "Slovensko Kemijsko Drustvo, Ljubljana",
journal = "Acta Chimica Slovenica",
title = "Rapid Electrochemical Method for the Determination of L-DOPA in Extract From the Seeds of Mucuna Prurita",
volume = "63",
number = "2",
pages = "220-226",
doi = "10.17344/acsi.2015.1541"
}

Stanković, D., Samphao, A., Dojčinović, B. P.,& Kalcher, K.. (2016). Rapid Electrochemical Method for the Determination of L-DOPA in Extract From the Seeds of Mucuna Prurita. in Acta Chimica Slovenica
Slovensko Kemijsko Drustvo, Ljubljana., 63(2), 220-226.
https://doi.org/10.17344/acsi.2015.1541

Stanković D, Samphao A, Dojčinović BP, Kalcher K. Rapid Electrochemical Method for the Determination of L-DOPA in Extract From the Seeds of Mucuna Prurita. in Acta Chimica Slovenica. 2016;63(2):220-226.
doi:10.17344/acsi.2015.1541 .

Stanković, Dalibor, Samphao, Anchalee, Dojčinović, Biljana P., Kalcher, Kurt, "Rapid Electrochemical Method for the Determination of L-DOPA in Extract From the Seeds of Mucuna Prurita" in Acta Chimica Slovenica, 63, no. 2 (2016):220-226,
https://doi.org/10.17344/acsi.2015.1541 . .

TY  - JOUR
AU  - Šovrc, Ľubomír
AU  - Cinková, Kristína
AU  - Samphao, Anchalee
AU  - Stanković, Dalibor
AU  - Mehmeti, Eda
AU  - Kalcher, Kurt
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1702
AB  - A novel analytical approach for the sensitive determination of a beta-carboline alkaloid, harmaline, was developed using pulse voltammetric techniques with a boron-doped diamond electrode. Cyclic voltammetry showed two irreversible oxidation peaks at about +0.90 and +1.20 V (vs. Ag/AgCl) in Britton-Robinson buffer solution at pH 5. Under optimized experimental conditions, differential pulse and square-wave voltammetry were elaborated for the determination of harmaline in a linear concentration range from 0.2 to 100.7 and from 0.4 to 104.5 mu mol L-1, respectively, with detection limits of 0.08 and 0.2 mu mol L-1, respectively. The practical feasibility of the developed method was demonstrated by quantification of harmaline in the extracts of natural food products such as Syrian rue (Peganum harmala, also known as esphant, harmal, yiizerlik) seeds, locally used as condiment and medicine in Turkey and the Near and Middle East, and the South American shamanic drink component Ayahuasca liane (Banisteriopsis caapi) with results in good agreement with those obtained by high-performance liquid chromatography as a reference method. The proposed sensor represents an effective electrochemical tool and inexpensive alternative for quality control analysis of food products containing harmaline.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Voltammetric determination of harmaline in natural food products using boron-doped diamond electrode
VL  - 744
SP  - 37
EP  - 44
DO  - 10.1016/j.jelechem.2015.03.004
ER  - 

@article{
author = "Šovrc, Ľubomír and Cinková, Kristína and Samphao, Anchalee and Stanković, Dalibor and Mehmeti, Eda and Kalcher, Kurt",
year = "2015",
abstract = "A novel analytical approach for the sensitive determination of a beta-carboline alkaloid, harmaline, was developed using pulse voltammetric techniques with a boron-doped diamond electrode. Cyclic voltammetry showed two irreversible oxidation peaks at about +0.90 and +1.20 V (vs. Ag/AgCl) in Britton-Robinson buffer solution at pH 5. Under optimized experimental conditions, differential pulse and square-wave voltammetry were elaborated for the determination of harmaline in a linear concentration range from 0.2 to 100.7 and from 0.4 to 104.5 mu mol L-1, respectively, with detection limits of 0.08 and 0.2 mu mol L-1, respectively. The practical feasibility of the developed method was demonstrated by quantification of harmaline in the extracts of natural food products such as Syrian rue (Peganum harmala, also known as esphant, harmal, yiizerlik) seeds, locally used as condiment and medicine in Turkey and the Near and Middle East, and the South American shamanic drink component Ayahuasca liane (Banisteriopsis caapi) with results in good agreement with those obtained by high-performance liquid chromatography as a reference method. The proposed sensor represents an effective electrochemical tool and inexpensive alternative for quality control analysis of food products containing harmaline.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Voltammetric determination of harmaline in natural food products using boron-doped diamond electrode",
volume = "744",
pages = "37-44",
doi = "10.1016/j.jelechem.2015.03.004"
}

Šovrc, Ľ., Cinková, K., Samphao, A., Stanković, D., Mehmeti, E.,& Kalcher, K.. (2015). Voltammetric determination of harmaline in natural food products using boron-doped diamond electrode. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 744, 37-44.
https://doi.org/10.1016/j.jelechem.2015.03.004

Šovrc Ľ, Cinková K, Samphao A, Stanković D, Mehmeti E, Kalcher K. Voltammetric determination of harmaline in natural food products using boron-doped diamond electrode. in Journal of Electroanalytical Chemistry. 2015;744:37-44.
doi:10.1016/j.jelechem.2015.03.004 .

Šovrc, Ľubomír, Cinková, Kristína, Samphao, Anchalee, Stanković, Dalibor, Mehmeti, Eda, Kalcher, Kurt, "Voltammetric determination of harmaline in natural food products using boron-doped diamond electrode" in Journal of Electroanalytical Chemistry, 744 (2015):37-44,
https://doi.org/10.1016/j.jelechem.2015.03.004 . .

TY  - JOUR
AU  - Stanković, Dalibor
AU  - Samphao, Anchalee
AU  - Kuzmanović, Darko
AU  - Kalcher, Kurt
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1725
AB  - This paper presents, for the first time, electrochemical behavior of diterpene lactone andrographolide and its voltammetric determination using differential pulse voltammetry (DPV) at boron-doped diamond electrode, in human urine and oil extract from Andrographis paniculata seeds. Andrographolide, due to its chemical structure, provides well defined peak at +1.55 V vs. Ag/AgCl electrode (3 M) in Britton-Robinson buffer solution pH 12. The proposed method, under optimum experimental parameters displays excellent selectivity towards andrographolide in the presence of some interference, as ascorbic acid, uric acid and dopamine, with detection limit of 0.75 mu M. Calibration curves were found to be linear in the range from 2 to 40 mu M, with two linear ranges, first from 2 to 10 mu M and second from 10 to 40 mu M with corresponding equations I (mu A) = (4.00 +/- 0.12) c (mu M) + (13.42 +/- 0.66) (R-2 = 0.9975) and I (mu A) = (0.87 +/- 0.05) c (mu M) + (46.33 +/- 1.53) (R-2 = 0.9767), respectively. Relative standard deviation of 7 measurements was 4% which verified excellent repeatability of proposed method and this method was successfully applied for the determination of andrographolide in human urine sample and extract from the A. paniculata seeds. The Prussian blue method was used for validation of the proposed elactroanalytical method. (C) 2015 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - Microchemical Journal
T1  - Novel electroanalyical method for the determination of andrographolide from Andrographis paniculata extract and urine samples
VL  - 122
SP  - 16
EP  - 19
DO  - 10.1016/j.microc.2015.04.005
ER  - 

@article{
author = "Stanković, Dalibor and Samphao, Anchalee and Kuzmanović, Darko and Kalcher, Kurt",
year = "2015",
abstract = "This paper presents, for the first time, electrochemical behavior of diterpene lactone andrographolide and its voltammetric determination using differential pulse voltammetry (DPV) at boron-doped diamond electrode, in human urine and oil extract from Andrographis paniculata seeds. Andrographolide, due to its chemical structure, provides well defined peak at +1.55 V vs. Ag/AgCl electrode (3 M) in Britton-Robinson buffer solution pH 12. The proposed method, under optimum experimental parameters displays excellent selectivity towards andrographolide in the presence of some interference, as ascorbic acid, uric acid and dopamine, with detection limit of 0.75 mu M. Calibration curves were found to be linear in the range from 2 to 40 mu M, with two linear ranges, first from 2 to 10 mu M and second from 10 to 40 mu M with corresponding equations I (mu A) = (4.00 +/- 0.12) c (mu M) + (13.42 +/- 0.66) (R-2 = 0.9975) and I (mu A) = (0.87 +/- 0.05) c (mu M) + (46.33 +/- 1.53) (R-2 = 0.9767), respectively. Relative standard deviation of 7 measurements was 4% which verified excellent repeatability of proposed method and this method was successfully applied for the determination of andrographolide in human urine sample and extract from the A. paniculata seeds. The Prussian blue method was used for validation of the proposed elactroanalytical method. (C) 2015 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Microchemical Journal",
title = "Novel electroanalyical method for the determination of andrographolide from Andrographis paniculata extract and urine samples",
volume = "122",
pages = "16-19",
doi = "10.1016/j.microc.2015.04.005"
}

Stanković, D., Samphao, A., Kuzmanović, D.,& Kalcher, K.. (2015). Novel electroanalyical method for the determination of andrographolide from Andrographis paniculata extract and urine samples. in Microchemical Journal
Elsevier Science Bv, Amsterdam., 122, 16-19.
https://doi.org/10.1016/j.microc.2015.04.005

Stanković D, Samphao A, Kuzmanović D, Kalcher K. Novel electroanalyical method for the determination of andrographolide from Andrographis paniculata extract and urine samples. in Microchemical Journal. 2015;122:16-19.
doi:10.1016/j.microc.2015.04.005 .

Stanković, Dalibor, Samphao, Anchalee, Kuzmanović, Darko, Kalcher, Kurt, "Novel electroanalyical method for the determination of andrographolide from Andrographis paniculata extract and urine samples" in Microchemical Journal, 122 (2015):16-19,
https://doi.org/10.1016/j.microc.2015.04.005 . .

TY  - JOUR
AU  - Stanković, Dalibor
AU  - Samphao, Anchalee
AU  - Kalcher, Kurt
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2033
AB  - Determination of berberine, an isoquinoline plant alkaloid, with antibacterial, antiparasitic, antifungal, hypotensive and antitumoral effects, was proposed by introducing square wave voltammetry on boron-doped diamond electrode. At optimized experimental parameters, in Britton-Robinson buffer solution pH 5 berberine provides 3 oxidation peaks (+0.63; +1.14 and +1.34 V) and one reduction (+0.15 V) ( vs. Ag/AgCl electrode), with good repeatability (relative standard deviation of 2.6% and 1.9% for 8 measurements at 0.5 and 10 mu M concentration level, respectively). Calibration curve was linear in wade linear range from 0.1 to 50 mu M with limit of detection of 0.04 mu M. The proposed procedure was successfully applied for the determination of berberine in seed extract from Argemone mexicana with satisfactory recovery ( 102-102.6%). The developed method may represent a sensitive alternative to highly toxic mercury electrodes, modified electrodes and chromatographic methods.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Electroanalysis
T1  - Anti-cancer Herbal Drug Berberine - Sensitive Determination Using Boron-doped Diamond Electrode
VL  - 27
IS  - 12
SP  - 2753
EP  - 2759
DO  - 10.1002/elan.201500356
ER  - 

@article{
author = "Stanković, Dalibor and Samphao, Anchalee and Kalcher, Kurt",
year = "2015",
abstract = "Determination of berberine, an isoquinoline plant alkaloid, with antibacterial, antiparasitic, antifungal, hypotensive and antitumoral effects, was proposed by introducing square wave voltammetry on boron-doped diamond electrode. At optimized experimental parameters, in Britton-Robinson buffer solution pH 5 berberine provides 3 oxidation peaks (+0.63; +1.14 and +1.34 V) and one reduction (+0.15 V) ( vs. Ag/AgCl electrode), with good repeatability (relative standard deviation of 2.6% and 1.9% for 8 measurements at 0.5 and 10 mu M concentration level, respectively). Calibration curve was linear in wade linear range from 0.1 to 50 mu M with limit of detection of 0.04 mu M. The proposed procedure was successfully applied for the determination of berberine in seed extract from Argemone mexicana with satisfactory recovery ( 102-102.6%). The developed method may represent a sensitive alternative to highly toxic mercury electrodes, modified electrodes and chromatographic methods.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Electroanalysis",
title = "Anti-cancer Herbal Drug Berberine - Sensitive Determination Using Boron-doped Diamond Electrode",
volume = "27",
number = "12",
pages = "2753-2759",
doi = "10.1002/elan.201500356"
}

Stanković, D., Samphao, A.,& Kalcher, K.. (2015). Anti-cancer Herbal Drug Berberine - Sensitive Determination Using Boron-doped Diamond Electrode. in Electroanalysis
Wiley-V C H Verlag Gmbh, Weinheim., 27(12), 2753-2759.
https://doi.org/10.1002/elan.201500356

Stanković D, Samphao A, Kalcher K. Anti-cancer Herbal Drug Berberine - Sensitive Determination Using Boron-doped Diamond Electrode. in Electroanalysis. 2015;27(12):2753-2759.
doi:10.1002/elan.201500356 .

Stanković, Dalibor, Samphao, Anchalee, Kalcher, Kurt, "Anti-cancer Herbal Drug Berberine - Sensitive Determination Using Boron-doped Diamond Electrode" in Electroanalysis, 27, no. 12 (2015):2753-2759,
https://doi.org/10.1002/elan.201500356 . .

TY  - JOUR
AU  - Samphao, Anchalee
AU  - Kunpatee, Kanjana
AU  - Prayoonpokarach, Sanchai
AU  - Wittayakun, Jatuporn
AU  - Šovrc, Ľubomír
AU  - Stanković, Dalibor
AU  - Zagar, Kristina
AU  - Ceh, Miran
AU  - Kalcher, Kurt
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2034
AB  - An ethanol biosensor based on alcohol dehydrogenase (ADH) attached to Au seeds decorated on magnetic nanoparticles (Fe3O4"Au NPs) is presented. ADH was immobilized on Fe3O4"Au NPs, which were subsequently fixed by a magnet on a carbon paste electrode modified with 5% (m:m) MnO2. Optimum conditions for the amperometric determination of ethanol with the biosensor were as follows: working potential +0.1 V (vs. Ag/AgCl); supporting electrolyte: 0.1 M phosphate buffer solution at pH 6.8 containing 0.25 mM of the coenzyme (NAD+); working electrode: carbon paste with magnetically attached Fe3O4"Au NPs (0.012 mg . cm(-2) electrode area) with immobilized alcohol dehydrogenase (120 units per cm(2) of electrode area). Linearity between signal and concentration was found for the range from 0.1 to 2.0 M ethanol (r(2) = 0.995) with a detection limit of 0.07 M, a sensitivity of 0.02 mu A . mM(-1) . cm(-2), a reproducibility of 4.0% RSD, and a repeatability of 2.7% RSD. The results for the determination of ethanol in alcoholic beverages showed good agreement with gas chromatography (GC) with recovery of 96.0-108.8%.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Electroanalysis
T1  - An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles
VL  - 27
IS  - 12
SP  - 2829
EP  - 2837
DO  - 10.1002/elan.201500315
ER  - 

@article{
author = "Samphao, Anchalee and Kunpatee, Kanjana and Prayoonpokarach, Sanchai and Wittayakun, Jatuporn and Šovrc, Ľubomír and Stanković, Dalibor and Zagar, Kristina and Ceh, Miran and Kalcher, Kurt",
year = "2015",
abstract = "An ethanol biosensor based on alcohol dehydrogenase (ADH) attached to Au seeds decorated on magnetic nanoparticles (Fe3O4"Au NPs) is presented. ADH was immobilized on Fe3O4"Au NPs, which were subsequently fixed by a magnet on a carbon paste electrode modified with 5% (m:m) MnO2. Optimum conditions for the amperometric determination of ethanol with the biosensor were as follows: working potential +0.1 V (vs. Ag/AgCl); supporting electrolyte: 0.1 M phosphate buffer solution at pH 6.8 containing 0.25 mM of the coenzyme (NAD+); working electrode: carbon paste with magnetically attached Fe3O4"Au NPs (0.012 mg . cm(-2) electrode area) with immobilized alcohol dehydrogenase (120 units per cm(2) of electrode area). Linearity between signal and concentration was found for the range from 0.1 to 2.0 M ethanol (r(2) = 0.995) with a detection limit of 0.07 M, a sensitivity of 0.02 mu A . mM(-1) . cm(-2), a reproducibility of 4.0% RSD, and a repeatability of 2.7% RSD. The results for the determination of ethanol in alcoholic beverages showed good agreement with gas chromatography (GC) with recovery of 96.0-108.8%.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Electroanalysis",
title = "An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles",
volume = "27",
number = "12",
pages = "2829-2837",
doi = "10.1002/elan.201500315"
}

Samphao, A., Kunpatee, K., Prayoonpokarach, S., Wittayakun, J., Šovrc, Ľ., Stanković, D., Zagar, K., Ceh, M.,& Kalcher, K.. (2015). An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. in Electroanalysis
Wiley-V C H Verlag Gmbh, Weinheim., 27(12), 2829-2837.
https://doi.org/10.1002/elan.201500315

Samphao A, Kunpatee K, Prayoonpokarach S, Wittayakun J, Šovrc Ľ, Stanković D, Zagar K, Ceh M, Kalcher K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. in Electroanalysis. 2015;27(12):2829-2837.
doi:10.1002/elan.201500315 .

Samphao, Anchalee, Kunpatee, Kanjana, Prayoonpokarach, Sanchai, Wittayakun, Jatuporn, Šovrc, Ľubomír, Stanković, Dalibor, Zagar, Kristina, Ceh, Miran, Kalcher, Kurt, "An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles" in Electroanalysis, 27, no. 12 (2015):2829-2837,
https://doi.org/10.1002/elan.201500315 . .

TY  - DATA
AU  - Samphao, Anchalee
AU  - Kunpatee, Kanjana
AU  - Prayoonpokarach, Sanchai
AU  - Wittayakun, Jatuporn
AU  - Šovrc, Ľubomír
AU  - Stanković, Dalibor
AU  - Zagar, Kristina
AU  - Ceh, Miran
AU  - Kalcher, Kurt
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3331
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Electroanalysis
T1  - Supplementary data for the article: Samphao, A.; Kunpatee, K.; Prayoonpokarach, S.; Wittayakun, J.; Švorc, L.; Stankovic, D. M.; Zagar, K.; Ceh, M.; Kalcher, K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. Electroanalysis 2015, 27 (12), 2829–2837. https://doi.org/10.1002/elan.201500315
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3331
ER  - 

@misc{
author = "Samphao, Anchalee and Kunpatee, Kanjana and Prayoonpokarach, Sanchai and Wittayakun, Jatuporn and Šovrc, Ľubomír and Stanković, Dalibor and Zagar, Kristina and Ceh, Miran and Kalcher, Kurt",
year = "2015",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Electroanalysis",
title = "Supplementary data for the article: Samphao, A.; Kunpatee, K.; Prayoonpokarach, S.; Wittayakun, J.; Švorc, L.; Stankovic, D. M.; Zagar, K.; Ceh, M.; Kalcher, K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. Electroanalysis 2015, 27 (12), 2829–2837. https://doi.org/10.1002/elan.201500315",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3331"
}

Samphao, A., Kunpatee, K., Prayoonpokarach, S., Wittayakun, J., Šovrc, Ľ., Stanković, D., Zagar, K., Ceh, M.,& Kalcher, K.. (2015). Supplementary data for the article: Samphao, A.; Kunpatee, K.; Prayoonpokarach, S.; Wittayakun, J.; Švorc, L.; Stankovic, D. M.; Zagar, K.; Ceh, M.; Kalcher, K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. Electroanalysis 2015, 27 (12), 2829–2837. https://doi.org/10.1002/elan.201500315. in Electroanalysis
Wiley-V C H Verlag Gmbh, Weinheim..
https://hdl.handle.net/21.15107/rcub_cherry_3331

Samphao A, Kunpatee K, Prayoonpokarach S, Wittayakun J, Šovrc Ľ, Stanković D, Zagar K, Ceh M, Kalcher K. Supplementary data for the article: Samphao, A.; Kunpatee, K.; Prayoonpokarach, S.; Wittayakun, J.; Švorc, L.; Stankovic, D. M.; Zagar, K.; Ceh, M.; Kalcher, K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. Electroanalysis 2015, 27 (12), 2829–2837. https://doi.org/10.1002/elan.201500315. in Electroanalysis. 2015;.
https://hdl.handle.net/21.15107/rcub_cherry_3331 .

Samphao, Anchalee, Kunpatee, Kanjana, Prayoonpokarach, Sanchai, Wittayakun, Jatuporn, Šovrc, Ľubomír, Stanković, Dalibor, Zagar, Kristina, Ceh, Miran, Kalcher, Kurt, "Supplementary data for the article: Samphao, A.; Kunpatee, K.; Prayoonpokarach, S.; Wittayakun, J.; Švorc, L.; Stankovic, D. M.; Zagar, K.; Ceh, M.; Kalcher, K. An Ethanol Biosensor Based on Simple Immobilization of Alcohol Dehydrogenase on Fe3O4"Au Nanoparticles. Electroanalysis 2015, 27 (12), 2829–2837. https://doi.org/10.1002/elan.201500315" in Electroanalysis (2015),
https://hdl.handle.net/21.15107/rcub_cherry_3331 .