TY  - JOUR
AU  - Đurđić, Slađana
AU  - Stanković, Vesna
AU  - Vlahović, Filip
AU  - Ognjanović, Miloš
AU  - Kalcher, Kurt
AU  - Manojlović, Dragan D.
AU  - Mutić, Jelena
AU  - Stanković, Dalibor M.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9816
AB  - L-DOPA (L-3,4-dihydroxyphenylalanine), the precursor of dopamine, is widely used in the treatment of Parkinson’s disease, thus determining and monitoring the concentration of L-DOPA is of utmost importance for both medical and scientific purposes. Although many analytical approaches, designed for drug detection and quantification, already exist, there is a constant need for modification of old and tailoring of new, faster, and selective methods. Redox active chemical species, such as L-DOPA, can be measured directly by electrochemical means, whereas electrochemical sensors combine sensitivity and selectivity within a small analytical device. This work demonstrates the development of such electrochemical sensor, based on carboxylated single-wall carbon nanotubes (SWCNT-COOH) decorated with SiO2 coated-Nd2O3 nanoparticles, and further application for the detection of L-DOPA. Developed SWCNT-COOH@Nd2O3-SiO2 sensor shows linear response in the range from 2 µmol L−1 to 52 µmol L−1 analyte concentration, and beside the low detection limit, it is characterized by a fast response time, as well as good life-time, reproducibility and repeatability.
T2  - Microchemical Journal
T1  - Carboxylated single-wall carbon nanotubes decorated with SiO2 coated-Nd2O3 nanoparticles as an electrochemical sensor for L-DOPA detection
VL  - 168
SP  - 106416
DO  - 10.1016/j.microc.2021.106416
ER  - 

@article{
author = "Đurđić, Slađana and Stanković, Vesna and Vlahović, Filip and Ognjanović, Miloš and Kalcher, Kurt and Manojlović, Dragan D. and Mutić, Jelena and Stanković, Dalibor M.",
year = "2021",
abstract = "L-DOPA (L-3,4-dihydroxyphenylalanine), the precursor of dopamine, is widely used in the treatment of Parkinson’s disease, thus determining and monitoring the concentration of L-DOPA is of utmost importance for both medical and scientific purposes. Although many analytical approaches, designed for drug detection and quantification, already exist, there is a constant need for modification of old and tailoring of new, faster, and selective methods. Redox active chemical species, such as L-DOPA, can be measured directly by electrochemical means, whereas electrochemical sensors combine sensitivity and selectivity within a small analytical device. This work demonstrates the development of such electrochemical sensor, based on carboxylated single-wall carbon nanotubes (SWCNT-COOH) decorated with SiO2 coated-Nd2O3 nanoparticles, and further application for the detection of L-DOPA. Developed SWCNT-COOH@Nd2O3-SiO2 sensor shows linear response in the range from 2 µmol L−1 to 52 µmol L−1 analyte concentration, and beside the low detection limit, it is characterized by a fast response time, as well as good life-time, reproducibility and repeatability.",
journal = "Microchemical Journal",
title = "Carboxylated single-wall carbon nanotubes decorated with SiO2 coated-Nd2O3 nanoparticles as an electrochemical sensor for L-DOPA detection",
volume = "168",
pages = "106416",
doi = "10.1016/j.microc.2021.106416"
}

Đurđić, S., Stanković, V., Vlahović, F., Ognjanović, M., Kalcher, K., Manojlović, D. D., Mutić, J.,& Stanković, D. M.. (2021). Carboxylated single-wall carbon nanotubes decorated with SiO2 coated-Nd2O3 nanoparticles as an electrochemical sensor for L-DOPA detection. in Microchemical Journal, 168, 106416.
https://doi.org/10.1016/j.microc.2021.106416

Đurđić S, Stanković V, Vlahović F, Ognjanović M, Kalcher K, Manojlović DD, Mutić J, Stanković DM. Carboxylated single-wall carbon nanotubes decorated with SiO2 coated-Nd2O3 nanoparticles as an electrochemical sensor for L-DOPA detection. in Microchemical Journal. 2021;168:106416.
doi:10.1016/j.microc.2021.106416 .

Đurđić, Slađana, Stanković, Vesna, Vlahović, Filip, Ognjanović, Miloš, Kalcher, Kurt, Manojlović, Dragan D., Mutić, Jelena, Stanković, Dalibor M., "Carboxylated single-wall carbon nanotubes decorated with SiO2 coated-Nd2O3 nanoparticles as an electrochemical sensor for L-DOPA detection" in Microchemical Journal, 168 (2021):106416,
https://doi.org/10.1016/j.microc.2021.106416 . .

TY  - JOUR
AU  - Stanković, Vesna
AU  - Đurđić, Slađana
AU  - Ognjanović, Miloš
AU  - Antić, Bratislav
AU  - Kalcher, Kurt
AU  - Mutić, Jelena J.
AU  - Stanković, Dalibor M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8819
AB  - Diagnosis and treatment of some important diseased and metabolic disorders is based on successful detection of albumin. In this work, we aim to develop a simple immunosensor for the detection of human serum albumin in biological fluids. Anti-human albumin antibody was covalently attached to the activated surface of screen-printed carbon electrodes enriched with carboxyl graphene/gold nanoparticles composite. Microstructure (TEM, FE-SEM, XRD) and electrochemical (CV, EIS) characterization methods were used to investigate composite properties and to confirm the successful modification of the electrodes. Under the optimal conditions, linear working range and limit of detection were 2.5–500 μg/mL and 1.55 μg/mL, respectively. Additionally, the effect of some possibly interfering compounds was investigated and the immunosensor was used for real sample analysis. The results showed that the sensor exhibited accurate, precise and sensitive characteristics and can be promising replacement to the convention methods for albumin detection in clinical practice.
T2  - Journal of Electroanalytical Chemistry
T1  - Anti-human albumin monoclonal antibody immobilized on EDC-NHS functionalized carboxylic graphene/AuNPs composite as promising electrochemical HSA immunosensor
VL  - 860
SP  - 113928
DO  - 10.1016/j.jelechem.2020.113928
ER  - 

@article{
author = "Stanković, Vesna and Đurđić, Slađana and Ognjanović, Miloš and Antić, Bratislav and Kalcher, Kurt and Mutić, Jelena J. and Stanković, Dalibor M.",
year = "2020",
abstract = "Diagnosis and treatment of some important diseased and metabolic disorders is based on successful detection of albumin. In this work, we aim to develop a simple immunosensor for the detection of human serum albumin in biological fluids. Anti-human albumin antibody was covalently attached to the activated surface of screen-printed carbon electrodes enriched with carboxyl graphene/gold nanoparticles composite. Microstructure (TEM, FE-SEM, XRD) and electrochemical (CV, EIS) characterization methods were used to investigate composite properties and to confirm the successful modification of the electrodes. Under the optimal conditions, linear working range and limit of detection were 2.5–500 μg/mL and 1.55 μg/mL, respectively. Additionally, the effect of some possibly interfering compounds was investigated and the immunosensor was used for real sample analysis. The results showed that the sensor exhibited accurate, precise and sensitive characteristics and can be promising replacement to the convention methods for albumin detection in clinical practice.",
journal = "Journal of Electroanalytical Chemistry",
title = "Anti-human albumin monoclonal antibody immobilized on EDC-NHS functionalized carboxylic graphene/AuNPs composite as promising electrochemical HSA immunosensor",
volume = "860",
pages = "113928",
doi = "10.1016/j.jelechem.2020.113928"
}

Stanković, V., Đurđić, S., Ognjanović, M., Antić, B., Kalcher, K., Mutić, J. J.,& Stanković, D. M.. (2020). Anti-human albumin monoclonal antibody immobilized on EDC-NHS functionalized carboxylic graphene/AuNPs composite as promising electrochemical HSA immunosensor. in Journal of Electroanalytical Chemistry, 860, 113928.
https://doi.org/10.1016/j.jelechem.2020.113928

Stanković V, Đurđić S, Ognjanović M, Antić B, Kalcher K, Mutić JJ, Stanković DM. Anti-human albumin monoclonal antibody immobilized on EDC-NHS functionalized carboxylic graphene/AuNPs composite as promising electrochemical HSA immunosensor. in Journal of Electroanalytical Chemistry. 2020;860:113928.
doi:10.1016/j.jelechem.2020.113928 .

Stanković, Vesna, Đurđić, Slađana, Ognjanović, Miloš, Antić, Bratislav, Kalcher, Kurt, Mutić, Jelena J., Stanković, Dalibor M., "Anti-human albumin monoclonal antibody immobilized on EDC-NHS functionalized carboxylic graphene/AuNPs composite as promising electrochemical HSA immunosensor" in Journal of Electroanalytical Chemistry, 860 (2020):113928,
https://doi.org/10.1016/j.jelechem.2020.113928 . .

TY  - JOUR
AU  - Zrinski, Ivana
AU  - Pungjunun, Kingkan
AU  - Martinez, Sanja
AU  - Zavašnik, Janez
AU  - Stanković, Dalibor M.
AU  - Kalcher, Kurt
AU  - Mehmeti, Eda
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8588
AB  - A simple and highly sensitive electrochemical biosensor based on laccase immobilized onto a gold nanoparticles/graphene nanoplatelets-modified screen-printed carbon electrode (LACC/AuNP/GNPl/SPCE) was developed for the determination of hydroquinone (HQ) and other phenolic compounds. The biosensor shows excellent electro-catalytic activity towards oxidation of hydroquinone at a potential of -0.05 V (vs Ag/AgCl, 3 M KCl) in phosphate buffer as supporting electrolyte (0.1 M, pH 7.0) using hydrodynamic amperometry. Analytical characteristics uncover that the LACC/AuNP/GNPl/SPCE comprises a wide linear range for the dependence of the signal on HQ concentrations from 4 to 130 µM with a detection limit (3σ) of 1.5 µM. The repeatability (5 measurements, 100 µM hydroquinone) is ±2% and the reproducibility (5 biosensors, 100 µM hydroquinone) is ±3%. Interference studies of most common compounds with the determination of hydroquinone demonstrated negligible effects. Finally, the biosensor and the analytical method were applied to the determination of phenolic antioxidant capacity (AOC) in wine and blueberry syrup based on Trolox (6‑hydroxy‑2,5,7,8-tetramethylchromane-2-carboxylic acid) and hydroquinone equivalents. The results were evaluated by using their calibration curves which were satisfactory and agreed well with the results obtained by the reference method Trolox Equivalent Antioxidant Capacity assay (TEAC-Assay).
T2  - Microchemical Journal
T1  - Evaluation of phenolic antioxidant capacity in beverages based on laccase immobilized on screen-printed carbon electrode modified with graphene nanoplatelets and gold nanoparticles
VL  - 152
SP  - 104282
DO  - 10.1016/j.microc.2019.104282
ER  - 

@article{
author = "Zrinski, Ivana and Pungjunun, Kingkan and Martinez, Sanja and Zavašnik, Janez and Stanković, Dalibor M. and Kalcher, Kurt and Mehmeti, Eda",
year = "2020",
abstract = "A simple and highly sensitive electrochemical biosensor based on laccase immobilized onto a gold nanoparticles/graphene nanoplatelets-modified screen-printed carbon electrode (LACC/AuNP/GNPl/SPCE) was developed for the determination of hydroquinone (HQ) and other phenolic compounds. The biosensor shows excellent electro-catalytic activity towards oxidation of hydroquinone at a potential of -0.05 V (vs Ag/AgCl, 3 M KCl) in phosphate buffer as supporting electrolyte (0.1 M, pH 7.0) using hydrodynamic amperometry. Analytical characteristics uncover that the LACC/AuNP/GNPl/SPCE comprises a wide linear range for the dependence of the signal on HQ concentrations from 4 to 130 µM with a detection limit (3σ) of 1.5 µM. The repeatability (5 measurements, 100 µM hydroquinone) is ±2% and the reproducibility (5 biosensors, 100 µM hydroquinone) is ±3%. Interference studies of most common compounds with the determination of hydroquinone demonstrated negligible effects. Finally, the biosensor and the analytical method were applied to the determination of phenolic antioxidant capacity (AOC) in wine and blueberry syrup based on Trolox (6‑hydroxy‑2,5,7,8-tetramethylchromane-2-carboxylic acid) and hydroquinone equivalents. The results were evaluated by using their calibration curves which were satisfactory and agreed well with the results obtained by the reference method Trolox Equivalent Antioxidant Capacity assay (TEAC-Assay).",
journal = "Microchemical Journal",
title = "Evaluation of phenolic antioxidant capacity in beverages based on laccase immobilized on screen-printed carbon electrode modified with graphene nanoplatelets and gold nanoparticles",
volume = "152",
pages = "104282",
doi = "10.1016/j.microc.2019.104282"
}

Zrinski, I., Pungjunun, K., Martinez, S., Zavašnik, J., Stanković, D. M., Kalcher, K.,& Mehmeti, E.. (2020). Evaluation of phenolic antioxidant capacity in beverages based on laccase immobilized on screen-printed carbon electrode modified with graphene nanoplatelets and gold nanoparticles. in Microchemical Journal, 152, 104282.
https://doi.org/10.1016/j.microc.2019.104282

Zrinski I, Pungjunun K, Martinez S, Zavašnik J, Stanković DM, Kalcher K, Mehmeti E. Evaluation of phenolic antioxidant capacity in beverages based on laccase immobilized on screen-printed carbon electrode modified with graphene nanoplatelets and gold nanoparticles. in Microchemical Journal. 2020;152:104282.
doi:10.1016/j.microc.2019.104282 .

Zrinski, Ivana, Pungjunun, Kingkan, Martinez, Sanja, Zavašnik, Janez, Stanković, Dalibor M., Kalcher, Kurt, Mehmeti, Eda, "Evaluation of phenolic antioxidant capacity in beverages based on laccase immobilized on screen-printed carbon electrode modified with graphene nanoplatelets and gold nanoparticles" in Microchemical Journal, 152 (2020):104282,
https://doi.org/10.1016/j.microc.2019.104282 . .

TY  - JOUR
AU  - Stanković, Vesna
AU  - Đurđić, Slađana Z.
AU  - Ognjanović, Miloš
AU  - Mutić, Jelena
AU  - Kalcher, Kurt
AU  - Stanković, Dalibor M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9111
AB  - A nonenzymatic hydrogen-peroxide sensor was developed by utilization of silver nanoparticles and graphene nanoribbons. The mentioned composite was inflicted on a screen-printed carbon electrode which provides disposable, ready-to-use sensor. The structure and morphology of the nanocomposite were analyzed by scanning electron microscopy and X-ray diffraction. The sensor has excellent performance toward H2O2 amperometric detection. Figures of merit include dynamic response range from 0.05 to 5 mM and detection limit of 20 μM (at S/N = 3). The fabricated sensor was used for the determination of H2O2 in milk samples. The obtained results showed that the proposed AgNp@GNR/SPCE sensor can be used for the determination of hydrogen peroxide in real samples.
T2  - Journal of Electroanalytical Chemistry
T1  - A novel nonenzymatic hydrogen peroxide amperometric sensor based on AgNp@GNR nanocomposites modified screen-printed carbon electrode
VL  - 876
SP  - 114487
DO  - 10.1016/j.jelechem.2020.114487
ER  - 

@article{
author = "Stanković, Vesna and Đurđić, Slađana Z. and Ognjanović, Miloš and Mutić, Jelena and Kalcher, Kurt and Stanković, Dalibor M.",
year = "2020",
abstract = "A nonenzymatic hydrogen-peroxide sensor was developed by utilization of silver nanoparticles and graphene nanoribbons. The mentioned composite was inflicted on a screen-printed carbon electrode which provides disposable, ready-to-use sensor. The structure and morphology of the nanocomposite were analyzed by scanning electron microscopy and X-ray diffraction. The sensor has excellent performance toward H2O2 amperometric detection. Figures of merit include dynamic response range from 0.05 to 5 mM and detection limit of 20 μM (at S/N = 3). The fabricated sensor was used for the determination of H2O2 in milk samples. The obtained results showed that the proposed AgNp@GNR/SPCE sensor can be used for the determination of hydrogen peroxide in real samples.",
journal = "Journal of Electroanalytical Chemistry",
title = "A novel nonenzymatic hydrogen peroxide amperometric sensor based on AgNp@GNR nanocomposites modified screen-printed carbon electrode",
volume = "876",
pages = "114487",
doi = "10.1016/j.jelechem.2020.114487"
}

Stanković, V., Đurđić, S. Z., Ognjanović, M., Mutić, J., Kalcher, K.,& Stanković, D. M.. (2020). A novel nonenzymatic hydrogen peroxide amperometric sensor based on AgNp@GNR nanocomposites modified screen-printed carbon electrode. in Journal of Electroanalytical Chemistry, 876, 114487.
https://doi.org/10.1016/j.jelechem.2020.114487

Stanković V, Đurđić SZ, Ognjanović M, Mutić J, Kalcher K, Stanković DM. A novel nonenzymatic hydrogen peroxide amperometric sensor based on AgNp@GNR nanocomposites modified screen-printed carbon electrode. in Journal of Electroanalytical Chemistry. 2020;876:114487.
doi:10.1016/j.jelechem.2020.114487 .

Stanković, Vesna, Đurđić, Slađana Z., Ognjanović, Miloš, Mutić, Jelena, Kalcher, Kurt, Stanković, Dalibor M., "A novel nonenzymatic hydrogen peroxide amperometric sensor based on AgNp@GNR nanocomposites modified screen-printed carbon electrode" in Journal of Electroanalytical Chemistry, 876 (2020):114487,
https://doi.org/10.1016/j.jelechem.2020.114487 . .

TY  - JOUR
AU  - Butmee, P.
AU  - Tumcharern, G.
AU  - Saejueng, P.
AU  - Stanković, Dalibor M.
AU  - Ortner, Astrid
AU  - Jitcharoen, J.
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10624
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 M. 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. M., 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 DM, 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 M., 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  - Đurđić, Slađana
AU  - Vukojević, Vesna
AU  - Vlahović, Filip
AU  - Ognjanović, Miloš
AU  - Švorc, Lubomir
AU  - Kalcher, Kurt
AU  - Mutić, Jelena J.
AU  - Stanković, Dalibor M.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8498
AB  - In present work we report application of bismuth (III) oxide (Bi2O3) decorated graphene nanoribbons (GNR) composite for modification of screen printed electrode, and use of resulting modified screen-printed electrode (SPCE/GNR/Bi2O3) as a disposable glucose biosensor. The composite was synthesized by use of co-precipitation method followed by ultra-sonication. After characterization, the material was applied on the surface of the screen-printed electrode in a ‘drop casting’ fashion. Glucose oxidase (GOx) was added to the modified surface and finally covered by Nafion film. Resulting biosensor electrode (SPCE/GNR/Bi2O3/GOx/Naf) shows excellent performance toward glucose detection, with working linear range from 0.28 to 1.70 mM and detection limit of 0.07 mM. Prepared biosensor was applied for the estimation of glucose level in standard honey samples with declared glucose level, in order to validate the methods (PT scheme). Obtained results are indicating excellent stability, reproducibility, accuracy and precision of the method for the determination of glucose in such samples with negligible matrix effect. Developed biosensor showed high precision, accuracy and selectivity even when employed for determination of glucose content in blood serum and urine samples. Proposed biosensor construction shows promising results and can be considered as stabile and reproducible tool for detection and quantification of glucose in investigated samples. © 2019 Elsevier B.V.
T2  - Journal of Electroanalytical Chemistry
T1  - Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing
VL  - 850
SP  - 113400
DO  - 10.1016/j.jelechem.2019.113400
ER  - 

@article{
author = "Đurđić, Slađana and Vukojević, Vesna and Vlahović, Filip and Ognjanović, Miloš and Švorc, Lubomir and Kalcher, Kurt and Mutić, Jelena J. and Stanković, Dalibor M.",
year = "2019",
abstract = "In present work we report application of bismuth (III) oxide (Bi2O3) decorated graphene nanoribbons (GNR) composite for modification of screen printed electrode, and use of resulting modified screen-printed electrode (SPCE/GNR/Bi2O3) as a disposable glucose biosensor. The composite was synthesized by use of co-precipitation method followed by ultra-sonication. After characterization, the material was applied on the surface of the screen-printed electrode in a ‘drop casting’ fashion. Glucose oxidase (GOx) was added to the modified surface and finally covered by Nafion film. Resulting biosensor electrode (SPCE/GNR/Bi2O3/GOx/Naf) shows excellent performance toward glucose detection, with working linear range from 0.28 to 1.70 mM and detection limit of 0.07 mM. Prepared biosensor was applied for the estimation of glucose level in standard honey samples with declared glucose level, in order to validate the methods (PT scheme). Obtained results are indicating excellent stability, reproducibility, accuracy and precision of the method for the determination of glucose in such samples with negligible matrix effect. Developed biosensor showed high precision, accuracy and selectivity even when employed for determination of glucose content in blood serum and urine samples. Proposed biosensor construction shows promising results and can be considered as stabile and reproducible tool for detection and quantification of glucose in investigated samples. © 2019 Elsevier B.V.",
journal = "Journal of Electroanalytical Chemistry",
title = "Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing",
volume = "850",
pages = "113400",
doi = "10.1016/j.jelechem.2019.113400"
}

Đurđić, S., Vukojević, V., Vlahović, F., Ognjanović, M., Švorc, L., Kalcher, K., Mutić, J. J.,& Stanković, D. M.. (2019). Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing. in Journal of Electroanalytical Chemistry, 850, 113400.
https://doi.org/10.1016/j.jelechem.2019.113400

Đurđić S, Vukojević V, Vlahović F, Ognjanović M, Švorc L, Kalcher K, Mutić JJ, Stanković DM. Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing. in Journal of Electroanalytical Chemistry. 2019;850:113400.
doi:10.1016/j.jelechem.2019.113400 .

Đurđić, Slađana, Vukojević, Vesna, Vlahović, Filip, Ognjanović, Miloš, Švorc, Lubomir, Kalcher, Kurt, Mutić, Jelena J., Stanković, Dalibor M., "Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing" in Journal of Electroanalytical Chemistry, 850 (2019):113400,
https://doi.org/10.1016/j.jelechem.2019.113400 . .

TY  - JOUR
AU  - Butmee, Preeyanut
AU  - Tumcharern, Gamolwan
AU  - Saejueng, Pranorm
AU  - Stanković, Dalibor M.
AU  - Ortner, Astrid
AU  - Jitcharoen, Juthamas
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7989
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. © 2018
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, Preeyanut and Tumcharern, Gamolwan and Saejueng, Pranorm and Stanković, Dalibor M. and Ortner, Astrid and Jitcharoen, Juthamas 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. © 2018",
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. M., 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 DM, 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, Preeyanut, Tumcharern, Gamolwan, Saejueng, Pranorm, Stanković, Dalibor M., Ortner, Astrid, Jitcharoen, Juthamas, 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 M.
AU  - Ortner, Astrid
AU  - Kalcher, Kurt
AU  - Samphao, Anchalee
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8667
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.
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 M. 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.",
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. M., 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, 855, 113630.
https://doi.org/10.1016/j.jelechem.2019.113630

Kunpatee K, Chamsai P, Mehmeti E, Stanković DM, 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 M., 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
AU  - Ognjanović, Miloš
AU  - Antić, Bratislav
AU  - Kalcher, Kurt
AU  - Mutić, Jelena J.
AU  - Stanković, Dalibor M.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0956566318304688
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7766
AB  - In this work, we aimed to propose a newly synthesized composite material with enhanced electrocatalytic properties as a novel screen-printed sensor for the quantification of NADH. Additionally, the surface was modified with alcohol dehydrogenase for the preparation of an amperometric biosensor for analysis of ethanol. Synthesized material was characterized using several microstructural (FE-SEM, HR-TEM, XRD) and electrochemical (CV, EIS) techniques. The electrochemical response of the tested analytes was investigated as a function of important parameters. Under optimal conditions, the working linear range and limit of detection for ethanol sensing was 1–1800 µM and 0.19 µM, respectively. For NADH, the linear range was from 1 to 1300 µM with limit of detection of 0.52 µM. Moreover, effects of some possible interfering compounds were investigated and the developed procedure was applied to commercial alcoholic beverages. The results obtained showed satisfactory precision and accuracy of the developed method and confirm the proposed approach could be a possible replacement for the currently used techniques for ethanol and NADH quantification.
T2  - Biosensors and Bioelectronics
T1  - RuO2/graphene nanoribbon composite supported on screen printed electrode with enhanced electrocatalytic performances toward ethanol and NADH biosensing
VL  - 117
SP  - 392
EP  - 397
DO  - 10.1016/j.bios.2018.06.038
ER  - 

@article{
author = "Vukojević, Vesna and Đurđić, Slađana and Ognjanović, Miloš and Antić, Bratislav and Kalcher, Kurt and Mutić, Jelena J. and Stanković, Dalibor M.",
year = "2018",
abstract = "In this work, we aimed to propose a newly synthesized composite material with enhanced electrocatalytic properties as a novel screen-printed sensor for the quantification of NADH. Additionally, the surface was modified with alcohol dehydrogenase for the preparation of an amperometric biosensor for analysis of ethanol. Synthesized material was characterized using several microstructural (FE-SEM, HR-TEM, XRD) and electrochemical (CV, EIS) techniques. The electrochemical response of the tested analytes was investigated as a function of important parameters. Under optimal conditions, the working linear range and limit of detection for ethanol sensing was 1–1800 µM and 0.19 µM, respectively. For NADH, the linear range was from 1 to 1300 µM with limit of detection of 0.52 µM. Moreover, effects of some possible interfering compounds were investigated and the developed procedure was applied to commercial alcoholic beverages. The results obtained showed satisfactory precision and accuracy of the developed method and confirm the proposed approach could be a possible replacement for the currently used techniques for ethanol and NADH quantification.",
journal = "Biosensors and Bioelectronics",
title = "RuO2/graphene nanoribbon composite supported on screen printed electrode with enhanced electrocatalytic performances toward ethanol and NADH biosensing",
volume = "117",
pages = "392-397",
doi = "10.1016/j.bios.2018.06.038"
}

Vukojević, V., Đurđić, S., Ognjanović, M., Antić, B., Kalcher, K., Mutić, J. J.,& Stanković, D. M.. (2018). RuO2/graphene nanoribbon composite supported on screen printed electrode with enhanced electrocatalytic performances toward ethanol and NADH biosensing. in Biosensors and Bioelectronics, 117, 392-397.
https://doi.org/10.1016/j.bios.2018.06.038

Vukojević V, Đurđić S, Ognjanović M, Antić B, Kalcher K, Mutić JJ, Stanković DM. RuO2/graphene nanoribbon composite supported on screen printed electrode with enhanced electrocatalytic performances toward ethanol and NADH biosensing. in Biosensors and Bioelectronics. 2018;117:392-397.
doi:10.1016/j.bios.2018.06.038 .

Vukojević, Vesna, Đurđić, Slađana, Ognjanović, Miloš, Antić, Bratislav, Kalcher, Kurt, Mutić, Jelena J., Stanković, Dalibor M., "RuO2/graphene nanoribbon composite supported on screen printed electrode with enhanced electrocatalytic performances toward ethanol and NADH biosensing" in Biosensors and Bioelectronics, 117 (2018):392-397,
https://doi.org/10.1016/j.bios.2018.06.038 . .

TY  - JOUR
AU  - Vukojević, Vesna
AU  - Đurđić, Slađana
AU  - Ognjanović, Miloš
AU  - Fabian, Martin
AU  - Samphao, Anchalee
AU  - Kalcher, Kurt
AU  - Stanković, Dalibor M.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S157266571830479X
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7780
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®. 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 μA/mmol cm2. Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.
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 and Ognjanović, Miloš and Fabian, Martin and Samphao, Anchalee and Kalcher, Kurt and Stanković, Dalibor M.",
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®. 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 μA/mmol cm2. Developed method was tested toward glucose quantification in real samples with satisfactory accuracy and precision.",
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., Ognjanović, M., Fabian, M., Samphao, A., Kalcher, K.,& Stanković, D. M.. (2018). Enzymatic glucose biosensor based on manganese dioxide nanoparticles decorated on graphene nanoribbons. in Journal of Electroanalytical Chemistry, 823, 610-616.
https://doi.org/10.1016/j.jelechem.2018.07.013

Vukojević V, Đurđić S, Ognjanović M, Fabian M, Samphao A, Kalcher K, Stanković DM. 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, Ognjanović, Miloš, Fabian, Martin, Samphao, Anchalee, Kalcher, Kurt, Stanković, Dalibor M., "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  - Mehmeti, Eda
AU  - Stanković, Dalibor M.
AU  - Chaiyo, Sudkate
AU  - Zavasnik, Janez
AU  - Zagar, Kristina
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1477
AB  - A reagentless third generation electrochemical glucose biosensor was fabricated based on wiring the template enzyme glucose oxidase (GOx) with graphene nanoribbons (GN) in order to create direct electron transfer between the co-factor (flavin adenine dinucleotide, FAD) and the electrode. The strategy involved: (i) isolation of the apo-enzyme by separating it from its co-enzyme; (ii) preparation of graphene nanoribbons (GN) by oxidative unzipping of multi-walled carbon nanotubes; (iii) adsorptive immobilization of GNs on the surface of a screen printed carbon electrode (SPCE); (iv) covalent attachment of FAD to the nanoribbons; (v) recombination of the apo-enzyme with the covalently bound FAD to the holoenzyme; and (vi) stabilization of the bio-layer with a thin membrane of Nafion. The biosensor (referred to as GN/FAD/apo-GOx/Nafion/SPCE) is operated at a potential of +0.475 V vs Ag/AgCl/{3 M KCl} in flow-injection mode with an oxygen-free phosphate buffer (pH 7.5) acting as a carrier. The signals are linearly proportional to the concentration of glucose in the range from 50 to 2000 mgai...L-1 with a detection limit of 20 mgai...L-1. The repeatability (10 measurements, at 1000 mgai...L-1 glucose) is +/- 1.4% and the reproducibility (5 sensors, 1000 mgai...L-1 glucose) is +/- 1.8%. The biosensor was applied to the determination of glucose in human serum.
T2  - Microchimica Acta
T1  - Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor
VL  - 184
IS  - 4
SP  - 1127
EP  - 1134
DO  - 10.1007/s00604-017-2115-5
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor M. and Chaiyo, Sudkate and Zavasnik, Janez and Zagar, Kristina and Kalcher, Kurt",
year = "2017",
abstract = "A reagentless third generation electrochemical glucose biosensor was fabricated based on wiring the template enzyme glucose oxidase (GOx) with graphene nanoribbons (GN) in order to create direct electron transfer between the co-factor (flavin adenine dinucleotide, FAD) and the electrode. The strategy involved: (i) isolation of the apo-enzyme by separating it from its co-enzyme; (ii) preparation of graphene nanoribbons (GN) by oxidative unzipping of multi-walled carbon nanotubes; (iii) adsorptive immobilization of GNs on the surface of a screen printed carbon electrode (SPCE); (iv) covalent attachment of FAD to the nanoribbons; (v) recombination of the apo-enzyme with the covalently bound FAD to the holoenzyme; and (vi) stabilization of the bio-layer with a thin membrane of Nafion. The biosensor (referred to as GN/FAD/apo-GOx/Nafion/SPCE) is operated at a potential of +0.475 V vs Ag/AgCl/{3 M KCl} in flow-injection mode with an oxygen-free phosphate buffer (pH 7.5) acting as a carrier. The signals are linearly proportional to the concentration of glucose in the range from 50 to 2000 mgai...L-1 with a detection limit of 20 mgai...L-1. The repeatability (10 measurements, at 1000 mgai...L-1 glucose) is +/- 1.4% and the reproducibility (5 sensors, 1000 mgai...L-1 glucose) is +/- 1.8%. The biosensor was applied to the determination of glucose in human serum.",
journal = "Microchimica Acta",
title = "Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor",
volume = "184",
number = "4",
pages = "1127-1134",
doi = "10.1007/s00604-017-2115-5"
}

Mehmeti, E., Stanković, D. M., Chaiyo, S., Zavasnik, J., Zagar, K.,& Kalcher, K.. (2017). Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor. in Microchimica Acta, 184(4), 1127-1134.
https://doi.org/10.1007/s00604-017-2115-5

Mehmeti E, Stanković DM, Chaiyo S, Zavasnik J, Zagar K, Kalcher K. Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor. in Microchimica Acta. 2017;184(4):1127-1134.
doi:10.1007/s00604-017-2115-5 .

Mehmeti, Eda, Stanković, Dalibor M., Chaiyo, Sudkate, Zavasnik, Janez, Zagar, Kristina, Kalcher, Kurt, "Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor" in Microchimica Acta, 184, no. 4 (2017):1127-1134,
https://doi.org/10.1007/s00604-017-2115-5 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor M.
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1892
AB  - In this work a new electrochemical method will be presented for the determination of enalapril in pharmaceutical tablets using unmodified screen printed electrode (SPE). The studies were done using amperommetric detection. Enalapril provides well defined, ovalshape oxidation peak at +1.05 V (vs. Ag/AgCl, 3.0 M KCl) in Britton-Robinson buffer solution (BRBS) at pH 5.0. After optimization of the experimental conditions, the influence of most common interferent compounds was tested. Under optimized experimental conditions, the signals were linearly proportional to the concentration of enalapril in the range from 2.5 to 90 mu M with a detection limit of 0.9 mu M. Repeatability of ten replicate measurements of 5 mu M enalapril was estimated to be 1.5%. Proposed method was successfully applied for the determination of the total amount of enalapril content in pharmaceutical preparations. Nevertheless, proposed method could be beneficial for the quick quantifications of enalapril in drugs using unmodified SPE electrode without any further treatment.
T2  - Analytical and Bioanalytical Electrochemistry
T1  - Determination of Enalapril in Pharmaceuticals using Electrochemical Sensing with Amperometric Detection
VL  - 9
IS  - 8
SP  - 1000
EP  - 1007
UR  - https://hdl.handle.net/21.15107/rcub_vinar_1892
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor M. and Kalcher, Kurt",
year = "2017",
abstract = "In this work a new electrochemical method will be presented for the determination of enalapril in pharmaceutical tablets using unmodified screen printed electrode (SPE). The studies were done using amperommetric detection. Enalapril provides well defined, ovalshape oxidation peak at +1.05 V (vs. Ag/AgCl, 3.0 M KCl) in Britton-Robinson buffer solution (BRBS) at pH 5.0. After optimization of the experimental conditions, the influence of most common interferent compounds was tested. Under optimized experimental conditions, the signals were linearly proportional to the concentration of enalapril in the range from 2.5 to 90 mu M with a detection limit of 0.9 mu M. Repeatability of ten replicate measurements of 5 mu M enalapril was estimated to be 1.5%. Proposed method was successfully applied for the determination of the total amount of enalapril content in pharmaceutical preparations. Nevertheless, proposed method could be beneficial for the quick quantifications of enalapril in drugs using unmodified SPE electrode without any further treatment.",
journal = "Analytical and Bioanalytical Electrochemistry",
title = "Determination of Enalapril in Pharmaceuticals using Electrochemical Sensing with Amperometric Detection",
volume = "9",
number = "8",
pages = "1000-1007",
url = "https://hdl.handle.net/21.15107/rcub_vinar_1892"
}

Mehmeti, E., Stanković, D. M.,& Kalcher, K.. (2017). Determination of Enalapril in Pharmaceuticals using Electrochemical Sensing with Amperometric Detection. in Analytical and Bioanalytical Electrochemistry, 9(8), 1000-1007.
https://hdl.handle.net/21.15107/rcub_vinar_1892

Mehmeti E, Stanković DM, Kalcher K. Determination of Enalapril in Pharmaceuticals using Electrochemical Sensing with Amperometric Detection. in Analytical and Bioanalytical Electrochemistry. 2017;9(8):1000-1007.
https://hdl.handle.net/21.15107/rcub_vinar_1892 .

Mehmeti, Eda, Stanković, Dalibor M., Kalcher, Kurt, "Determination of Enalapril in Pharmaceuticals using Electrochemical Sensing with Amperometric Detection" in Analytical and Bioanalytical Electrochemistry, 9, no. 8 (2017):1000-1007,
https://hdl.handle.net/21.15107/rcub_vinar_1892 .

TY  - JOUR
AU  - Stanković, Dalibor M.
AU  - Švorc, Lubomir
AU  - Mariano, Jose F. M. L.
AU  - Ortner, Astrid
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1771
AB  - Colchicine (COLC) is a natural toxic product and secondary metabolite most commonly used to treat gout. In this study, its electrochemical behavior and determination was investigated by employing modification-free boron-doped diamond electrode (BDDE). Besides, its interaction with DNA was monitored using electrochemical methods. It was found that oxidation of this compound proceeds in two steps, where first sharp and well defined oxidation peak occurs at potential of around 1.19V, and second one at around 1.37V, in Britton-Robinson buffer solution at pH7.5. Wide dynamic range from 1 to 100 mu M was obtained with a detection limit (3 sigma(intercept)/slope) of a 0.26 mu M, based on the evaluation of first oxidation peak using differential pulse voltammetry. The proposed method was also found to be suitable for monitoring interaction of this drug with DNA as important segment for medical use. Concerning the validation, the analytical procedure shows excellent selectivity and sensitivity toward COLC detection and after method development it was successfully used for its quantification in pharmaceutical preparation and human serum sample, with satisfactory recovery. Obviously, this approach can be promising replacement for time-consuming and expensive separation methods.
T2  - Electroanalysis
T1  - Electrochemical Determination of Natural Drug Colchicine in Pharmaceuticals and Human Serum Sample and its Interaction with DNA
VL  - 29
IS  - 10
SP  - 2276
EP  - 2281
DO  - 10.1002/elan.201700233
ER  - 

@article{
author = "Stanković, Dalibor M. and Švorc, Lubomir and Mariano, Jose F. M. L. and Ortner, Astrid and Kalcher, Kurt",
year = "2017",
abstract = "Colchicine (COLC) is a natural toxic product and secondary metabolite most commonly used to treat gout. In this study, its electrochemical behavior and determination was investigated by employing modification-free boron-doped diamond electrode (BDDE). Besides, its interaction with DNA was monitored using electrochemical methods. It was found that oxidation of this compound proceeds in two steps, where first sharp and well defined oxidation peak occurs at potential of around 1.19V, and second one at around 1.37V, in Britton-Robinson buffer solution at pH7.5. Wide dynamic range from 1 to 100 mu M was obtained with a detection limit (3 sigma(intercept)/slope) of a 0.26 mu M, based on the evaluation of first oxidation peak using differential pulse voltammetry. The proposed method was also found to be suitable for monitoring interaction of this drug with DNA as important segment for medical use. Concerning the validation, the analytical procedure shows excellent selectivity and sensitivity toward COLC detection and after method development it was successfully used for its quantification in pharmaceutical preparation and human serum sample, with satisfactory recovery. Obviously, this approach can be promising replacement for time-consuming and expensive separation methods.",
journal = "Electroanalysis",
title = "Electrochemical Determination of Natural Drug Colchicine in Pharmaceuticals and Human Serum Sample and its Interaction with DNA",
volume = "29",
number = "10",
pages = "2276-2281",
doi = "10.1002/elan.201700233"
}

Stanković, D. M., Švorc, L., Mariano, J. F. M. L., Ortner, A.,& Kalcher, K.. (2017). Electrochemical Determination of Natural Drug Colchicine in Pharmaceuticals and Human Serum Sample and its Interaction with DNA. in Electroanalysis, 29(10), 2276-2281.
https://doi.org/10.1002/elan.201700233

Stanković DM, Švorc L, Mariano JFML, Ortner A, Kalcher K. Electrochemical Determination of Natural Drug Colchicine in Pharmaceuticals and Human Serum Sample and its Interaction with DNA. in Electroanalysis. 2017;29(10):2276-2281.
doi:10.1002/elan.201700233 .

Stanković, Dalibor M., Švorc, Lubomir, Mariano, Jose F. M. L., Ortner, Astrid, Kalcher, Kurt, "Electrochemical Determination of Natural Drug Colchicine in Pharmaceuticals and Human Serum Sample and its Interaction with DNA" in Electroanalysis, 29, no. 10 (2017):2276-2281,
https://doi.org/10.1002/elan.201700233 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor M.
AU  - Ortner, Astrid
AU  - Zavasnik, Janez
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1763
AB  - A boron-doped diamond electrode was used as an electrochemical sensor for the determination of phlorizin (aka phloridzin, phlorrhizin) using square wave voltammetry (SWV). Phlorizin (Phl) exhibited a well-defined oxidation peak at +0.9 V (versus Ag/AgCl electrode 3 M KCl) in solutions with a pH value of 6.0. Parameters such as pH value and scan rate were optimized for cyclic voltammetry as well as amplitude and frequency for SWV. The sensor gave excellent response with a wide linear dynamic range for concentrations of phlorizin from 3 to 100 mu M with a detection limit of 0.23 mu M and a good repeatability (+/- 0.9%, n = 7 measurements, c = 10 mu M). The effect of interferences by most common compounds was tested, and the method was successfully applied to the determination of the title compound in apple root extracts and urine samples with satisfactory recovery.
T2  - Food Analytical Methods
T1  - Highly Selective Electrochemical Determination of Phlorizin Using Square Wave Voltammetry at a Boron-Doped Diamond Electrode
VL  - 10
IS  - 11
SP  - 3747
EP  - 3752
DO  - 10.1007/s12161-017-0935-x
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor M. and Ortner, Astrid and Zavasnik, Janez and Kalcher, Kurt",
year = "2017",
abstract = "A boron-doped diamond electrode was used as an electrochemical sensor for the determination of phlorizin (aka phloridzin, phlorrhizin) using square wave voltammetry (SWV). Phlorizin (Phl) exhibited a well-defined oxidation peak at +0.9 V (versus Ag/AgCl electrode 3 M KCl) in solutions with a pH value of 6.0. Parameters such as pH value and scan rate were optimized for cyclic voltammetry as well as amplitude and frequency for SWV. The sensor gave excellent response with a wide linear dynamic range for concentrations of phlorizin from 3 to 100 mu M with a detection limit of 0.23 mu M and a good repeatability (+/- 0.9%, n = 7 measurements, c = 10 mu M). The effect of interferences by most common compounds was tested, and the method was successfully applied to the determination of the title compound in apple root extracts and urine samples with satisfactory recovery.",
journal = "Food Analytical Methods",
title = "Highly Selective Electrochemical Determination of Phlorizin Using Square Wave Voltammetry at a Boron-Doped Diamond Electrode",
volume = "10",
number = "11",
pages = "3747-3752",
doi = "10.1007/s12161-017-0935-x"
}

Mehmeti, E., Stanković, D. M., Ortner, A., Zavasnik, J.,& Kalcher, K.. (2017). Highly Selective Electrochemical Determination of Phlorizin Using Square Wave Voltammetry at a Boron-Doped Diamond Electrode. in Food Analytical Methods, 10(11), 3747-3752.
https://doi.org/10.1007/s12161-017-0935-x

Mehmeti E, Stanković DM, Ortner A, Zavasnik J, Kalcher K. Highly Selective Electrochemical Determination of Phlorizin Using Square Wave Voltammetry at a Boron-Doped Diamond Electrode. in Food Analytical Methods. 2017;10(11):3747-3752.
doi:10.1007/s12161-017-0935-x .

Mehmeti, Eda, Stanković, Dalibor M., Ortner, Astrid, Zavasnik, Janez, Kalcher, Kurt, "Highly Selective Electrochemical Determination of Phlorizin Using Square Wave Voltammetry at a Boron-Doped Diamond Electrode" in Food Analytical Methods, 10, no. 11 (2017):3747-3752,
https://doi.org/10.1007/s12161-017-0935-x . .

TY  - JOUR
AU  - Lakić, Mladen
AU  - Vukadinović, Aleksandar
AU  - Kalcher, Kurt
AU  - Nikolić, Aleksandar S.
AU  - Stanković, Dalibor M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1292
AB  - This work presents the simultaneous determination of catechol (CC) and hydroquinone (HQ), employing a modified carbon paste electrode (CPE) with ferrite nanomaterial. Ferrite nanomaterial was doped with different amount of cobalt and this was investigated toward simultaneous oxidation of CC and HQ. It was shown that this modification strongly increases electrochemical characteristics of the CPE. Also, electrocatalytic activity of such materials strongly depends on the level of substituted Co in the ferrite nanoparticles. The modified electrodes, labeled as CoFerrite/CPE, showed two pairs of well-defined redox peaks for the electrochemical processes of catechol and hydroquinone. Involving of ferrite material in the structure of CPE, cause increase in the potentials differences between redox couples of the investigated compounds, accompanied with increases in peaks currents. Several important parameters were optimized and calibration curves, with limits of detection (LOD) of 0.15 and 0.3 mu M for catechol and hydroquinone, respectively, were constructed by employing amperometric detection. Effect of possible interfering compounds was also studied, and proposed method was successfully applied for CC and HQ quantification in real samples.
T2  - Talanta
T1  - Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone
VL  - 161
SP  - 668
EP  - 674
DO  - 10.1016/j.talanta.2016.09.029
ER  - 

@article{
author = "Lakić, Mladen and Vukadinović, Aleksandar and Kalcher, Kurt and Nikolić, Aleksandar S. and Stanković, Dalibor M.",
year = "2016",
abstract = "This work presents the simultaneous determination of catechol (CC) and hydroquinone (HQ), employing a modified carbon paste electrode (CPE) with ferrite nanomaterial. Ferrite nanomaterial was doped with different amount of cobalt and this was investigated toward simultaneous oxidation of CC and HQ. It was shown that this modification strongly increases electrochemical characteristics of the CPE. Also, electrocatalytic activity of such materials strongly depends on the level of substituted Co in the ferrite nanoparticles. The modified electrodes, labeled as CoFerrite/CPE, showed two pairs of well-defined redox peaks for the electrochemical processes of catechol and hydroquinone. Involving of ferrite material in the structure of CPE, cause increase in the potentials differences between redox couples of the investigated compounds, accompanied with increases in peaks currents. Several important parameters were optimized and calibration curves, with limits of detection (LOD) of 0.15 and 0.3 mu M for catechol and hydroquinone, respectively, were constructed by employing amperometric detection. Effect of possible interfering compounds was also studied, and proposed method was successfully applied for CC and HQ quantification in real samples.",
journal = "Talanta",
title = "Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone",
volume = "161",
pages = "668-674",
doi = "10.1016/j.talanta.2016.09.029"
}

Lakić, M., Vukadinović, A., Kalcher, K., Nikolić, A. S.,& Stanković, D. M.. (2016). Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone. in Talanta, 161, 668-674.
https://doi.org/10.1016/j.talanta.2016.09.029

Lakić M, Vukadinović A, Kalcher K, Nikolić AS, Stanković DM. Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone. in Talanta. 2016;161:668-674.
doi:10.1016/j.talanta.2016.09.029 .

Lakić, Mladen, Vukadinović, Aleksandar, Kalcher, Kurt, Nikolić, Aleksandar S., Stanković, Dalibor M., "Effect of cobalt doping level of ferrites in enhancing sensitivity of analytical performances of carbon paste electrode for simultaneous determination of catechol and hydroquinone" in Talanta, 161 (2016):668-674,
https://doi.org/10.1016/j.talanta.2016.09.029 . .