TY  - JOUR
AU  - Ognjanović, Miloš
AU  - Nikolić, Katarina
AU  - Radenković, Marina
AU  - Lolić, Aleksandar
AU  - Stanković, Dalibor
AU  - Živković, Sanja
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5675
AB  - Gallic acid (GA) is one of the most important and present natural phenolic compounds due to its well-known biological properties, and its detection and monitoring is of great importance. Silver nanoparticles (AgNPs) are one of the most studied metallic nanomaterials used in various fields, from biomedical applications to electrochemical sensing devices. In this work, we used the pulsed laser ablation technique in liquid for the one-step preparation of nanoparticles of silver from a pure silver plate base in N,N-dimethylformamide. Obtained nanomaterial was characterized using morphological and electrochemical methods and used for modification of screen-printed carbon electrodes (SPCE). Successful immobilization at the surface is confirmed using the surface profiling method. A newly obtained sensor was used for the detection of GA. After parameters optimization, a differential pulse voltammetric protocol was developed, using two approaches - concentration vs. current (GA determination) and peak area vs. current (estimation of the antioxidant capacity). For the first approach sensor linearity was found to be in the range from 0.50 µM to 10 µM, with the limit of detection (LOD) of 0.16 µM and limit of quantification (LOQ) of 0.50 µM. In the second system operating linear range was the same, while LOD and LOQ were 0.11 µM and 0.34 µM, respectively. Practical application of the method was tested using two approaches: direct measurement of gallic acid in biological fluids and estimation of the antioxidant capacity and food quality purpose.
PB  - Elsevier
T2  - Surfaces and Interfaces
T1  - Picosecond laser-assisted synthesis of silver nanoparticles with high practical application as electroanalytical sensor
VL  - 35
SP  - 102464
DO  - 10.1016/j.surfin.2022.102464
ER  - 

@article{
author = "Ognjanović, Miloš and Nikolić, Katarina and Radenković, Marina and Lolić, Aleksandar and Stanković, Dalibor and Živković, Sanja",
year = "2022",
abstract = "Gallic acid (GA) is one of the most important and present natural phenolic compounds due to its well-known biological properties, and its detection and monitoring is of great importance. Silver nanoparticles (AgNPs) are one of the most studied metallic nanomaterials used in various fields, from biomedical applications to electrochemical sensing devices. In this work, we used the pulsed laser ablation technique in liquid for the one-step preparation of nanoparticles of silver from a pure silver plate base in N,N-dimethylformamide. Obtained nanomaterial was characterized using morphological and electrochemical methods and used for modification of screen-printed carbon electrodes (SPCE). Successful immobilization at the surface is confirmed using the surface profiling method. A newly obtained sensor was used for the detection of GA. After parameters optimization, a differential pulse voltammetric protocol was developed, using two approaches - concentration vs. current (GA determination) and peak area vs. current (estimation of the antioxidant capacity). For the first approach sensor linearity was found to be in the range from 0.50 µM to 10 µM, with the limit of detection (LOD) of 0.16 µM and limit of quantification (LOQ) of 0.50 µM. In the second system operating linear range was the same, while LOD and LOQ were 0.11 µM and 0.34 µM, respectively. Practical application of the method was tested using two approaches: direct measurement of gallic acid in biological fluids and estimation of the antioxidant capacity and food quality purpose.",
publisher = "Elsevier",
journal = "Surfaces and Interfaces",
title = "Picosecond laser-assisted synthesis of silver nanoparticles with high practical application as electroanalytical sensor",
volume = "35",
pages = "102464",
doi = "10.1016/j.surfin.2022.102464"
}

Ognjanović, M., Nikolić, K., Radenković, M., Lolić, A., Stanković, D.,& Živković, S.. (2022). Picosecond laser-assisted synthesis of silver nanoparticles with high practical application as electroanalytical sensor. in Surfaces and Interfaces
Elsevier., 35, 102464.
https://doi.org/10.1016/j.surfin.2022.102464

Ognjanović M, Nikolić K, Radenković M, Lolić A, Stanković D, Živković S. Picosecond laser-assisted synthesis of silver nanoparticles with high practical application as electroanalytical sensor. in Surfaces and Interfaces. 2022;35:102464.
doi:10.1016/j.surfin.2022.102464 .

Ognjanović, Miloš, Nikolić, Katarina, Radenković, Marina, Lolić, Aleksandar, Stanković, Dalibor, Živković, Sanja, "Picosecond laser-assisted synthesis of silver nanoparticles with high practical application as electroanalytical sensor" in Surfaces and Interfaces, 35 (2022):102464,
https://doi.org/10.1016/j.surfin.2022.102464 . .

TY  - JOUR
AU  - Ognjanović, Miloš
AU  - Nikolić, Katarina
AU  - Bošković, Marko
AU  - Pastor, Ferenc
AU  - Popov, Nina
AU  - Marciuš, Marijan
AU  - Krehula, Stjepko
AU  - Antić, Bratislav
AU  - Stanković, Dalibor
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5682
AB  - Morphine (MORPH) is natural alkaloid and mainly used as a pain reliever. Its monitoring in human body fluids is crucial for modern medicine. In this paper, we have developed an electrochemical sensor for submicromolar detection of MORPH. The sensor is based on modified carbon paste electrode (CPE) by investigating the FexW1-xO4 ratio in iron tungstate (FeWO4), as well as the ratio of this material in CPE. For the first time, the effect of the iron–tungsten ratio in terms of achieving the best possible electrochemical characteristics for the detection of an important molecule for humans was examined. Morphological and electrochemical characteristics of materials were studied. The best results were obtained using Fe1W3 and 7.5% of modifier in CPE. For MORPH detection, square wave voltammetry (SWV) was optimized. Under the optimized conditions, Fe1W3@CPE resulted in limit of detection (LOD) of the method of 0.58 µM and limit of quantification (LOQ) of 1.94 µM. The linear operating range between 5 and 85 µM of MORPH in the Britton–Robinson buffer solution (BRBS) at pH 8 as supporting electrolyte was obtained. The Fe1W3@CPE sensor resulted in good selectivity and excellent repeatability with relative standard deviation (RSD) and was applied in real-world samples of human urine. Application for direct MORPH detection, without tedious sample pretreatment procedures, suggests that developed electrochemical sensor has appeared to be a suitable competitor for efficient, precise, and accurate monitoring of the MORPH in biological fluids.
PB  - MDPI
T2  - Biosensors
T1  - Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor
VL  - 12
IS  - 11
SP  - 932
DO  - 10.3390/bios12110932
ER  - 

@article{
author = "Ognjanović, Miloš and Nikolić, Katarina and Bošković, Marko and Pastor, Ferenc and Popov, Nina and Marciuš, Marijan and Krehula, Stjepko and Antić, Bratislav and Stanković, Dalibor",
year = "2022",
abstract = "Morphine (MORPH) is natural alkaloid and mainly used as a pain reliever. Its monitoring in human body fluids is crucial for modern medicine. In this paper, we have developed an electrochemical sensor for submicromolar detection of MORPH. The sensor is based on modified carbon paste electrode (CPE) by investigating the FexW1-xO4 ratio in iron tungstate (FeWO4), as well as the ratio of this material in CPE. For the first time, the effect of the iron–tungsten ratio in terms of achieving the best possible electrochemical characteristics for the detection of an important molecule for humans was examined. Morphological and electrochemical characteristics of materials were studied. The best results were obtained using Fe1W3 and 7.5% of modifier in CPE. For MORPH detection, square wave voltammetry (SWV) was optimized. Under the optimized conditions, Fe1W3@CPE resulted in limit of detection (LOD) of the method of 0.58 µM and limit of quantification (LOQ) of 1.94 µM. The linear operating range between 5 and 85 µM of MORPH in the Britton–Robinson buffer solution (BRBS) at pH 8 as supporting electrolyte was obtained. The Fe1W3@CPE sensor resulted in good selectivity and excellent repeatability with relative standard deviation (RSD) and was applied in real-world samples of human urine. Application for direct MORPH detection, without tedious sample pretreatment procedures, suggests that developed electrochemical sensor has appeared to be a suitable competitor for efficient, precise, and accurate monitoring of the MORPH in biological fluids.",
publisher = "MDPI",
journal = "Biosensors",
title = "Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor",
volume = "12",
number = "11",
pages = "932",
doi = "10.3390/bios12110932"
}

Ognjanović, M., Nikolić, K., Bošković, M., Pastor, F., Popov, N., Marciuš, M., Krehula, S., Antić, B.,& Stanković, D.. (2022). Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor. in Biosensors
MDPI., 12(11), 932.
https://doi.org/10.3390/bios12110932

Ognjanović M, Nikolić K, Bošković M, Pastor F, Popov N, Marciuš M, Krehula S, Antić B, Stanković D. Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor. in Biosensors. 2022;12(11):932.
doi:10.3390/bios12110932 .

Ognjanović, Miloš, Nikolić, Katarina, Bošković, Marko, Pastor, Ferenc, Popov, Nina, Marciuš, Marijan, Krehula, Stjepko, Antić, Bratislav, Stanković, Dalibor, "Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor" in Biosensors, 12, no. 11 (2022):932,
https://doi.org/10.3390/bios12110932 . .

TY  - THES
AU  - Nikolić, Katarina
PY  - 2021
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4600
AB  - Srebrne nanočestice (AgNPs) su jedan od najproučavanijih metalnih nanomaterijala koja se primenjuju u različitim poljima, od biomedicine do uređaja sa elektrohemijskim senzorima. U ovom radu primenjena je tehnika pulsne laserske ablacije za direktnu sintezu nanočestica srebra. Dejstvom pikosekundnog laserskog zračenja na srebrnu ploćicu postavljenu u rastvor N,N dimetilformamidu dobijene su nanočestice koje su detaljno okarakterisane morfološkim i elektrohemijskim metodama. Srebrne nanočestice uniformnih dimenzija su zatim korišćene za modifikaciju površine štampanih ugljeničnih elektroda. Novodobijeni senzor je korišćen za detekciju galne kiseline u realnim uzorcima hrane primenom optimizovane diferencijalno pulsne voltametrijske metode. Rezultati dobijeni u ovoj studiji ukazuju da ovaj pristup nudi pouzdanu, preciznu i tačnu metodu za kvantifikaciju galne kiseline, sa dokazanom i izvodljivom praktičnom primenom ovog senzora u kontroli kvaliteta hrane.
T1  - Sinteza srebrnih nanočestica pikosekundnim laserom i njihova primena za dobijanje novog elektroanalitičkog senzora
SP  - 1
EP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4600
ER  - 

@mastersthesis{
author = "Nikolić, Katarina",
year = "2021",
abstract = "Srebrne nanočestice (AgNPs) su jedan od najproučavanijih metalnih nanomaterijala koja se primenjuju u različitim poljima, od biomedicine do uređaja sa elektrohemijskim senzorima. U ovom radu primenjena je tehnika pulsne laserske ablacije za direktnu sintezu nanočestica srebra. Dejstvom pikosekundnog laserskog zračenja na srebrnu ploćicu postavljenu u rastvor N,N dimetilformamidu dobijene su nanočestice koje su detaljno okarakterisane morfološkim i elektrohemijskim metodama. Srebrne nanočestice uniformnih dimenzija su zatim korišćene za modifikaciju površine štampanih ugljeničnih elektroda. Novodobijeni senzor je korišćen za detekciju galne kiseline u realnim uzorcima hrane primenom optimizovane diferencijalno pulsne voltametrijske metode. Rezultati dobijeni u ovoj studiji ukazuju da ovaj pristup nudi pouzdanu, preciznu i tačnu metodu za kvantifikaciju galne kiseline, sa dokazanom i izvodljivom praktičnom primenom ovog senzora u kontroli kvaliteta hrane.",
title = "Sinteza srebrnih nanočestica pikosekundnim laserom i njihova primena za dobijanje novog elektroanalitičkog senzora",
pages = "1-24",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4600"
}

Nikolić, K.. (2021). Sinteza srebrnih nanočestica pikosekundnim laserom i njihova primena za dobijanje novog elektroanalitičkog senzora. , 1-24.
https://hdl.handle.net/21.15107/rcub_cherry_4600

Nikolić K. Sinteza srebrnih nanočestica pikosekundnim laserom i njihova primena za dobijanje novog elektroanalitičkog senzora. 2021;:1-24.
https://hdl.handle.net/21.15107/rcub_cherry_4600 .

Nikolić, Katarina, "Sinteza srebrnih nanočestica pikosekundnim laserom i njihova primena za dobijanje novog elektroanalitičkog senzora" (2021):1-24,
https://hdl.handle.net/21.15107/rcub_cherry_4600 .

TY  - THES
AU  - Nikolić, Katarina
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4185
AB  - U ovom radu opisan je senzor za određivanje olova u uzorcima vina pomoću anodne striping voltametrije sa linearnom promenom potencijala (eng. linear sweep anodic stripping voltammetry, LSASV). Radna elektroda od staklastog ugljenika je modifikovana nanočesticama MnCo2O4. Ova metoda ne zahteva posebnu pripremu uzorka, radi razlaganja organskih komponenti iz rastvora. Optimizovani su uslovi pripreme uzorka (razblaženje) kao i parametri depozicije olova na elektrodi (potencijal i vreme depozicije). Sva merenja su izvedena u kiseloj sredini (HCl, 0,1 mol/dm3) sa dodatkom 0,1 mol/dm3 KCl kao pomoćnog elektrolita. Koncentracija olova u kompleksnom matriksu je određivana pomoću metode standardnog dodatka uz optimizovane uslove, potencijal depozicije i vreme depozicije su 1,4 V i 480 s. Rezultati dobijeni elektohemijskim senzorom su upoređeni sa rezultatima dobijenih atomskom apsorpcionom spektroskopijom na grafitnoj kiveti (eng. graphite furnace – atomic absorption spectrometry, GF-AAS), i t-test je pokazao dobro slaganje.
T1  - Voltametrijsko određivanje olova u uzorcima vina na elektrodi od staklastog ugljenika modifikovanoj nanočesticama
SP  - 2
EP  - 21
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4185
ER  - 

@misc{
author = "Nikolić, Katarina",
year = "2020",
abstract = "U ovom radu opisan je senzor za određivanje olova u uzorcima vina pomoću anodne striping voltametrije sa linearnom promenom potencijala (eng. linear sweep anodic stripping voltammetry, LSASV). Radna elektroda od staklastog ugljenika je modifikovana nanočesticama MnCo2O4. Ova metoda ne zahteva posebnu pripremu uzorka, radi razlaganja organskih komponenti iz rastvora. Optimizovani su uslovi pripreme uzorka (razblaženje) kao i parametri depozicije olova na elektrodi (potencijal i vreme depozicije). Sva merenja su izvedena u kiseloj sredini (HCl, 0,1 mol/dm3) sa dodatkom 0,1 mol/dm3 KCl kao pomoćnog elektrolita. Koncentracija olova u kompleksnom matriksu je određivana pomoću metode standardnog dodatka uz optimizovane uslove, potencijal depozicije i vreme depozicije su 1,4 V i 480 s. Rezultati dobijeni elektohemijskim senzorom su upoređeni sa rezultatima dobijenih atomskom apsorpcionom spektroskopijom na grafitnoj kiveti (eng. graphite furnace – atomic absorption spectrometry, GF-AAS), i t-test je pokazao dobro slaganje.",
title = "Voltametrijsko određivanje olova u uzorcima vina na elektrodi od staklastog ugljenika modifikovanoj nanočesticama",
pages = "2-21",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4185"
}

Nikolić, K.. (2020). Voltametrijsko određivanje olova u uzorcima vina na elektrodi od staklastog ugljenika modifikovanoj nanočesticama. , 2-21.
https://hdl.handle.net/21.15107/rcub_cherry_4185

Nikolić K. Voltametrijsko određivanje olova u uzorcima vina na elektrodi od staklastog ugljenika modifikovanoj nanočesticama. 2020;:2-21.
https://hdl.handle.net/21.15107/rcub_cherry_4185 .

Nikolić, Katarina, "Voltametrijsko određivanje olova u uzorcima vina na elektrodi od staklastog ugljenika modifikovanoj nanočesticama" (2020):2-21,
https://hdl.handle.net/21.15107/rcub_cherry_4185 .