TY  - DATA
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Chaiyo, Sudkate
AU  - Zavašnik, Janez
AU  - Žagar, Kristina
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3104
PB  - Springer Wien, Wien
T2  - Microchimica Acta
T1  - Supplementary data for article:           Mehmeti, E.; Stanković, D. M.; Chaiyo, S.; Zavasnik, J.; Žagar, K.; Kalcher, K. Wiring of Glucose Oxidase with Graphene Nanoribbons: An Electrochemical Third Generation Glucose Biosensor. Microchimica Acta 2017, 184 (4), 1127–1134. https://doi.org/10.1007/s00604-017-2115-5
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3104
ER  - 

@misc{
author = "Mehmeti, Eda and Stanković, Dalibor and Chaiyo, Sudkate and Zavašnik, Janez and Žagar, Kristina and Kalcher, Kurt",
year = "2017",
publisher = "Springer Wien, Wien",
journal = "Microchimica Acta",
title = "Supplementary data for article:           Mehmeti, E.; Stanković, D. M.; Chaiyo, S.; Zavasnik, J.; Žagar, K.; Kalcher, K. Wiring of Glucose Oxidase with Graphene Nanoribbons: An Electrochemical Third Generation Glucose Biosensor. Microchimica Acta 2017, 184 (4), 1127–1134. https://doi.org/10.1007/s00604-017-2115-5",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3104"
}

Mehmeti, E., Stanković, D., Chaiyo, S., Zavašnik, J., Žagar, K.,& Kalcher, K.. (2017). Supplementary data for article:           Mehmeti, E.; Stanković, D. M.; Chaiyo, S.; Zavasnik, J.; Žagar, K.; Kalcher, K. Wiring of Glucose Oxidase with Graphene Nanoribbons: An Electrochemical Third Generation Glucose Biosensor. Microchimica Acta 2017, 184 (4), 1127–1134. https://doi.org/10.1007/s00604-017-2115-5. in Microchimica Acta
Springer Wien, Wien..
https://hdl.handle.net/21.15107/rcub_cherry_3104

Mehmeti E, Stanković D, Chaiyo S, Zavašnik J, Žagar K, Kalcher K. Supplementary data for article:           Mehmeti, E.; Stanković, D. M.; Chaiyo, S.; Zavasnik, J.; Žagar, K.; Kalcher, K. Wiring of Glucose Oxidase with Graphene Nanoribbons: An Electrochemical Third Generation Glucose Biosensor. Microchimica Acta 2017, 184 (4), 1127–1134. https://doi.org/10.1007/s00604-017-2115-5. in Microchimica Acta. 2017;.
https://hdl.handle.net/21.15107/rcub_cherry_3104 .

Mehmeti, Eda, Stanković, Dalibor, Chaiyo, Sudkate, Zavašnik, Janez, Žagar, Kristina, Kalcher, Kurt, "Supplementary data for article:           Mehmeti, E.; Stanković, D. M.; Chaiyo, S.; Zavasnik, J.; Žagar, K.; Kalcher, K. Wiring of Glucose Oxidase with Graphene Nanoribbons: An Electrochemical Third Generation Glucose Biosensor. Microchimica Acta 2017, 184 (4), 1127–1134. https://doi.org/10.1007/s00604-017-2115-5" in Microchimica Acta (2017),
https://hdl.handle.net/21.15107/rcub_cherry_3104 .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Chaiyo, Sudkate
AU  - Zavašnik, Janez
AU  - Zagar, Kristina
AU  - Kalcher, Kurt
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2438
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.
PB  - Springer Wien, Wien
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 and Chaiyo, Sudkate and Zavašnik, 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.",
publisher = "Springer Wien, Wien",
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., Chaiyo, S., Zavašnik, J., Zagar, K.,& Kalcher, K.. (2017). Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor. in Microchimica Acta
Springer Wien, Wien., 184(4), 1127-1134.
https://doi.org/10.1007/s00604-017-2115-5

Mehmeti E, Stanković D, Chaiyo S, Zavašnik 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, Chaiyo, Sudkate, Zavašnik, 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  - Stojanović, Zorica S.
AU  - Mehmeti, Eda
AU  - Kalcher, Kurt
AU  - Guzsvany, Valeria
AU  - Stanković, Dalibor
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2302
AB  - In this work, a simple and rapid electrochemical method is presented for the voltammetric determination of histamine based on carbon paste electrodes bulk-modified with single-walled carbon nanotubes. As monitored in cyclic voltammetry histamine undergoes an irreversible electrochemical oxidation with a peak potential of ca. +1.25 V (vs. Ag/AgCl, 3 mol L-1 KCl) in phosphate buffer solution (PBS, 0.1 mol L-1, pH 6.0). At optimized differential pulse voltammetric parameters, the current response of histamine was linearly proportional to its concentration in the range from 4.5 to 720 mu mol L-1. A low limit of detection of 1.26 mu mol L-1 and a limit of quantification of 3.78 mu mol L-1 of histamine, as well as good reproducibility (RSD = 0.48-3.40 %) were obtained using the carbon paste electrode modified with single-walled carbon nanotubes. The proposed sensor was successfully applied to the determination of histamine in commercial beer and wine samples.
PB  - Springer, New York
T2  - Food Analytical Methods
T1  - SWCNT-modified carbon paste electrode as an electrochemical sensor for histamine determination in alcoholic beverages
VL  - 9
IS  - 10
SP  - 2701
EP  - 2710
DO  - 10.1007/s12161-016-0452-3
ER  - 

@article{
author = "Stojanović, Zorica S. and Mehmeti, Eda and Kalcher, Kurt and Guzsvany, Valeria and Stanković, Dalibor",
year = "2016",
abstract = "In this work, a simple and rapid electrochemical method is presented for the voltammetric determination of histamine based on carbon paste electrodes bulk-modified with single-walled carbon nanotubes. As monitored in cyclic voltammetry histamine undergoes an irreversible electrochemical oxidation with a peak potential of ca. +1.25 V (vs. Ag/AgCl, 3 mol L-1 KCl) in phosphate buffer solution (PBS, 0.1 mol L-1, pH 6.0). At optimized differential pulse voltammetric parameters, the current response of histamine was linearly proportional to its concentration in the range from 4.5 to 720 mu mol L-1. A low limit of detection of 1.26 mu mol L-1 and a limit of quantification of 3.78 mu mol L-1 of histamine, as well as good reproducibility (RSD = 0.48-3.40 %) were obtained using the carbon paste electrode modified with single-walled carbon nanotubes. The proposed sensor was successfully applied to the determination of histamine in commercial beer and wine samples.",
publisher = "Springer, New York",
journal = "Food Analytical Methods",
title = "SWCNT-modified carbon paste electrode as an electrochemical sensor for histamine determination in alcoholic beverages",
volume = "9",
number = "10",
pages = "2701-2710",
doi = "10.1007/s12161-016-0452-3"
}

Stojanović, Z. S., Mehmeti, E., Kalcher, K., Guzsvany, V.,& Stanković, D.. (2016). SWCNT-modified carbon paste electrode as an electrochemical sensor for histamine determination in alcoholic beverages. in Food Analytical Methods
Springer, New York., 9(10), 2701-2710.
https://doi.org/10.1007/s12161-016-0452-3

Stojanović ZS, Mehmeti E, Kalcher K, Guzsvany V, Stanković D. SWCNT-modified carbon paste electrode as an electrochemical sensor for histamine determination in alcoholic beverages. in Food Analytical Methods. 2016;9(10):2701-2710.
doi:10.1007/s12161-016-0452-3 .

Stojanović, Zorica S., Mehmeti, Eda, Kalcher, Kurt, Guzsvany, Valeria, Stanković, Dalibor, "SWCNT-modified carbon paste electrode as an electrochemical sensor for histamine determination in alcoholic beverages" in Food Analytical Methods, 9, no. 10 (2016):2701-2710,
https://doi.org/10.1007/s12161-016-0452-3 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Hajrizi, Ahmet
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3653
AB  - In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9 V (vs. Ag/AgCI, 3.0 M KCI) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105 mu M with the detection limit of 0.22 mu M. Reproducibility of ten replicate measurements of 1 M of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - Talanta
T1  - The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination
VL  - 159
SP  - 34
EP  - 39
DO  - 10.1016/j.talanta.2016.05.079
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor and Hajrizi, Ahmet and Kalcher, Kurt",
year = "2016",
abstract = "In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9 V (vs. Ag/AgCI, 3.0 M KCI) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105 mu M with the detection limit of 0.22 mu M. Reproducibility of ten replicate measurements of 1 M of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Talanta",
title = "The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination",
volume = "159",
pages = "34-39",
doi = "10.1016/j.talanta.2016.05.079"
}

Mehmeti, E., Stanković, D., Hajrizi, A.,& Kalcher, K.. (2016). The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination. in Talanta
Elsevier Science Bv, Amsterdam., 159, 34-39.
https://doi.org/10.1016/j.talanta.2016.05.079

Mehmeti E, Stanković D, Hajrizi A, Kalcher K. The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination. in Talanta. 2016;159:34-39.
doi:10.1016/j.talanta.2016.05.079 .

Mehmeti, Eda, Stanković, Dalibor, Hajrizi, Ahmet, Kalcher, Kurt, "The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination" in Talanta, 159 (2016):34-39,
https://doi.org/10.1016/j.talanta.2016.05.079 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Chaiyo, Sudkate
AU  - Šovrc, Ľubomír
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1926
AB  - A carbon paste electrode bulk was modified with MnO2 and investigated for use as an electrochemical sensor for riboflavin (vitamin B-2) using differential pulse voltammetry (DPV). Riboflavin displays a well expressed oxidation peak at -0.15 V (versus Ag/AgCl) in solutions with a pH value of 2. Effects of pH value, pulse amplitude and pulse time were optimized by employing DPV. The signals obtained are linearly related to the concentrations of riboflavin in the range from 0.02 to 9 mu M. Other features include a 15 nM detection limit, and good reproducibility (+/- 3 %) and repeatability (+/- 2 %). Interferences by common compounds were tested, and the method was successfully applied to the determination of riboflavin in pharmaceutical formulations where is gave recoveries in the range from 95 to 97 %.
PB  - Springer Wien, Wien
T2  - Microchimica Acta
T1  - Manganese dioxide-modified carbon paste electrode for voltammetric determination of riboflavin
VL  - 183
IS  - 5
SP  - 1619
EP  - 1624
DO  - 10.1007/s00604-016-1789-4
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor and Chaiyo, Sudkate and Šovrc, Ľubomír and Kalcher, Kurt",
year = "2016",
abstract = "A carbon paste electrode bulk was modified with MnO2 and investigated for use as an electrochemical sensor for riboflavin (vitamin B-2) using differential pulse voltammetry (DPV). Riboflavin displays a well expressed oxidation peak at -0.15 V (versus Ag/AgCl) in solutions with a pH value of 2. Effects of pH value, pulse amplitude and pulse time were optimized by employing DPV. The signals obtained are linearly related to the concentrations of riboflavin in the range from 0.02 to 9 mu M. Other features include a 15 nM detection limit, and good reproducibility (+/- 3 %) and repeatability (+/- 2 %). Interferences by common compounds were tested, and the method was successfully applied to the determination of riboflavin in pharmaceutical formulations where is gave recoveries in the range from 95 to 97 %.",
publisher = "Springer Wien, Wien",
journal = "Microchimica Acta",
title = "Manganese dioxide-modified carbon paste electrode for voltammetric determination of riboflavin",
volume = "183",
number = "5",
pages = "1619-1624",
doi = "10.1007/s00604-016-1789-4"
}

Mehmeti, E., Stanković, D., Chaiyo, S., Šovrc, Ľ.,& Kalcher, K.. (2016). Manganese dioxide-modified carbon paste electrode for voltammetric determination of riboflavin. in Microchimica Acta
Springer Wien, Wien., 183(5), 1619-1624.
https://doi.org/10.1007/s00604-016-1789-4

Mehmeti E, Stanković D, Chaiyo S, Šovrc Ľ, Kalcher K. Manganese dioxide-modified carbon paste electrode for voltammetric determination of riboflavin. in Microchimica Acta. 2016;183(5):1619-1624.
doi:10.1007/s00604-016-1789-4 .

Mehmeti, Eda, Stanković, Dalibor, Chaiyo, Sudkate, Šovrc, Ľubomír, Kalcher, Kurt, "Manganese dioxide-modified carbon paste electrode for voltammetric determination of riboflavin" in Microchimica Acta, 183, no. 5 (2016):1619-1624,
https://doi.org/10.1007/s00604-016-1789-4 . .

TY  - JOUR
AU  - Stanković, Dalibor
AU  - Mehmeti, Eda
AU  - Zavašnik, Janez
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2298
AB  - In this work, a comparative study between three different novel synthesized materials, cerium, titanium and selenium dioxide doped reduced graphene oxide, was done toward detection of nitrite in tap water. It was found that best response and analytical performance were achieved with acerium dioxide reduced graphene oxide modified glassy carbon electrode. The materials were synthesized and characterized with transmission electron microscopy (TEM), electrochemical impedance spectroscopy and UV-vis spectroscopy. The prepared electrode has a wide linear range from 0.7 to 385 mu M witha detection of 0.18 mu M using amperometric detection. Various parameters were optimized and the sensor was successfully applied for the nitrite ion quantification in tap water samples. Inclusion of different dopants in the graphene structure for novel materials to modify solid electrodes was found to enhance the catalytic effect toward nitrite detection. (C) 2016 Elsevier B.V. All Rights reserved.
PB  - Elsevier Science Sa, Lausanne
T2  - Sensors and Actuators B: Chemical
T1  - Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes
VL  - 236
SP  - 311
EP  - 317
DO  - 10.1016/j.snb.2016.06.018
ER  - 

@article{
author = "Stanković, Dalibor and Mehmeti, Eda and Zavašnik, Janez and Kalcher, Kurt",
year = "2016",
abstract = "In this work, a comparative study between three different novel synthesized materials, cerium, titanium and selenium dioxide doped reduced graphene oxide, was done toward detection of nitrite in tap water. It was found that best response and analytical performance were achieved with acerium dioxide reduced graphene oxide modified glassy carbon electrode. The materials were synthesized and characterized with transmission electron microscopy (TEM), electrochemical impedance spectroscopy and UV-vis spectroscopy. The prepared electrode has a wide linear range from 0.7 to 385 mu M witha detection of 0.18 mu M using amperometric detection. Various parameters were optimized and the sensor was successfully applied for the nitrite ion quantification in tap water samples. Inclusion of different dopants in the graphene structure for novel materials to modify solid electrodes was found to enhance the catalytic effect toward nitrite detection. (C) 2016 Elsevier B.V. All Rights reserved.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Sensors and Actuators B: Chemical",
title = "Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes",
volume = "236",
pages = "311-317",
doi = "10.1016/j.snb.2016.06.018"
}

Stanković, D., Mehmeti, E., Zavašnik, J.,& Kalcher, K.. (2016). Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes. in Sensors and Actuators B: Chemical
Elsevier Science Sa, Lausanne., 236, 311-317.
https://doi.org/10.1016/j.snb.2016.06.018

Stanković D, Mehmeti E, Zavašnik J, Kalcher K. Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes. in Sensors and Actuators B: Chemical. 2016;236:311-317.
doi:10.1016/j.snb.2016.06.018 .

Stanković, Dalibor, Mehmeti, Eda, Zavašnik, Janez, Kalcher, Kurt, "Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes" in Sensors and Actuators B: Chemical, 236 (2016):311-317,
https://doi.org/10.1016/j.snb.2016.06.018 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Hajrizi, Ahmet
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2292
AB  - In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9 V (vs. Ag/AgCI, 3.0 M KCI) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105 mu M with the detection limit of 0.22 mu M. Reproducibility of ten replicate measurements of 1 M of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - Talanta
T1  - The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination
VL  - 159
SP  - 34
EP  - 39
DO  - 10.1016/j.talanta.2016.05.079
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor and Hajrizi, Ahmet and Kalcher, Kurt",
year = "2016",
abstract = "In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9 V (vs. Ag/AgCI, 3.0 M KCI) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105 mu M with the detection limit of 0.22 mu M. Reproducibility of ten replicate measurements of 1 M of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Talanta",
title = "The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination",
volume = "159",
pages = "34-39",
doi = "10.1016/j.talanta.2016.05.079"
}

Mehmeti, E., Stanković, D., Hajrizi, A.,& Kalcher, K.. (2016). The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination. in Talanta
Elsevier Science Bv, Amsterdam., 159, 34-39.
https://doi.org/10.1016/j.talanta.2016.05.079

Mehmeti E, Stanković D, Hajrizi A, Kalcher K. The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination. in Talanta. 2016;159:34-39.
doi:10.1016/j.talanta.2016.05.079 .

Mehmeti, Eda, Stanković, Dalibor, Hajrizi, Ahmet, Kalcher, Kurt, "The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination" in Talanta, 159 (2016):34-39,
https://doi.org/10.1016/j.talanta.2016.05.079 . .

TY  - JOUR
AU  - Mehmeti, Eda
AU  - Stanković, Dalibor
AU  - Chaiyo, Sudkate
AU  - Šovrc, Ľubomír
AU  - Ortner, Astrid
AU  - Kalcher, Kurt
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2259
AB  - A simple, sensitive, and economically viable electrochemical method for the determination of ajmalicine was developed. The procedure involves a glassy carbon electrode modified with gold nanoparticles (GCE/AuNPs). In the work presented here gold nanoparticles were attached to the glassy carbon electrode by adsorption. Cyclic voltammetry was used for the first time for the electrochemical characterization of ajmalicine and differential pulse voltammetry for its quantitative determination. Britton-Robinson buffer solution in a range of pH values served as supporting electrolyte. The experimental conditions were optimized and it was found that ajmalicine provided a well-defined oxidation peak at a potential of +0.8 V vs. Ag/AgCl (3 M KCl). The method for the determination of ajmalicine showed a dynamic range for concentrations from 5 to 50 A mu M with a detection limit of 1.7 A mu M, good repeatability (RSD of 1.4 %) and reproducibility (RSD of 2.5 %). The effect of possible interferents (yohimbine, reserpine) appeared to be negligible. The proposed procedure was successfully applied for the first time to the determination of ajmalicine in commercially available oral solutions for medical applications with results in good agreement with the declared content of ajmalicine. [GRAPHICS]
PB  - Springer Wien, Wien
T2  - Monatshefte Fur Chemie
T1  - Electrochemical determination of ajmalicine using glassy carbon electrode modified with gold nanoparticles
VL  - 147
IS  - 7
SP  - 1161
EP  - 1166
DO  - 10.1007/s00706-016-1741-7
ER  - 

@article{
author = "Mehmeti, Eda and Stanković, Dalibor and Chaiyo, Sudkate and Šovrc, Ľubomír and Ortner, Astrid and Kalcher, Kurt",
year = "2016",
abstract = "A simple, sensitive, and economically viable electrochemical method for the determination of ajmalicine was developed. The procedure involves a glassy carbon electrode modified with gold nanoparticles (GCE/AuNPs). In the work presented here gold nanoparticles were attached to the glassy carbon electrode by adsorption. Cyclic voltammetry was used for the first time for the electrochemical characterization of ajmalicine and differential pulse voltammetry for its quantitative determination. Britton-Robinson buffer solution in a range of pH values served as supporting electrolyte. The experimental conditions were optimized and it was found that ajmalicine provided a well-defined oxidation peak at a potential of +0.8 V vs. Ag/AgCl (3 M KCl). The method for the determination of ajmalicine showed a dynamic range for concentrations from 5 to 50 A mu M with a detection limit of 1.7 A mu M, good repeatability (RSD of 1.4 %) and reproducibility (RSD of 2.5 %). The effect of possible interferents (yohimbine, reserpine) appeared to be negligible. The proposed procedure was successfully applied for the first time to the determination of ajmalicine in commercially available oral solutions for medical applications with results in good agreement with the declared content of ajmalicine. [GRAPHICS]",
publisher = "Springer Wien, Wien",
journal = "Monatshefte Fur Chemie",
title = "Electrochemical determination of ajmalicine using glassy carbon electrode modified with gold nanoparticles",
volume = "147",
number = "7",
pages = "1161-1166",
doi = "10.1007/s00706-016-1741-7"
}

Mehmeti, E., Stanković, D., Chaiyo, S., Šovrc, Ľ., Ortner, A.,& Kalcher, K.. (2016). Electrochemical determination of ajmalicine using glassy carbon electrode modified with gold nanoparticles. in Monatshefte Fur Chemie
Springer Wien, Wien., 147(7), 1161-1166.
https://doi.org/10.1007/s00706-016-1741-7

Mehmeti E, Stanković D, Chaiyo S, Šovrc Ľ, Ortner A, Kalcher K. Electrochemical determination of ajmalicine using glassy carbon electrode modified with gold nanoparticles. in Monatshefte Fur Chemie. 2016;147(7):1161-1166.
doi:10.1007/s00706-016-1741-7 .

Mehmeti, Eda, Stanković, Dalibor, Chaiyo, Sudkate, Šovrc, Ľubomír, Ortner, Astrid, Kalcher, Kurt, "Electrochemical determination of ajmalicine using glassy carbon electrode modified with gold nanoparticles" in Monatshefte Fur Chemie, 147, no. 7 (2016):1161-1166,
https://doi.org/10.1007/s00706-016-1741-7 . .