TY  - JOUR
AU  - Knežević, Sara
AU  - Ostojić, Jelena
AU  - Ognjanović, Miloš
AU  - Savić, Slađana D.
AU  - Kovačević, Aleksandra
AU  - Manojlović, Dragan D.
AU  - Stanković, Vesna
AU  - Stanković, Dalibor
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5694
AB  - Triclosan (TCS) is a polychlorinated phenoxy phenol (PCPPs) used as a disinfectant and a broad-spectrum antibacterial and antifungal agent in personal hygiene products. TCS easily forms diphenyl ethers and dioxins, which are persistent organic pollutants.

This work used a double approach for the TSC sensing: a) screen-printed (SPE) electrochemical platform for on-site application, modified with lanthanum iron oxide and graphitic carbon nitride composite (LaFeO3/Fe2O3@g-C3N4/SPE); and b) carbon paste electrode (CPE), modified with the same material and used in laboratory conditions. Linear range from 0.1 μM to 10 μM, the limit of detection (LOD) of 29 nM and the limit of quantification (LOQ) of 91 nM were obtained for CP electrode in BRBS pH 8. SPE showed the best analytical parameters in BRBS at pH 3, with a linear range from 0.3 μM to 7 μM, LOD of 0.09 μM and LOQ of 0.28 μM. Furthermore, the influence of potential interferents was investigated and proven to be negligible. Determination of TSC was performed to estimate the environmental impact of this compound as well as the practical usefulness of the proposed sensor in the real sample analysis, confirmed with a HPLC analysis.
PB  - Elsevier
T2  - Science of The Total Environment
T1  - The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan
IS  - 857
SP  - 159250
DO  - 10.1016/j.scitotenv.2022.159250
ER  - 

@article{
author = "Knežević, Sara and Ostojić, Jelena and Ognjanović, Miloš and Savić, Slađana D. and Kovačević, Aleksandra and Manojlović, Dragan D. and Stanković, Vesna and Stanković, Dalibor",
year = "2023",
abstract = "Triclosan (TCS) is a polychlorinated phenoxy phenol (PCPPs) used as a disinfectant and a broad-spectrum antibacterial and antifungal agent in personal hygiene products. TCS easily forms diphenyl ethers and dioxins, which are persistent organic pollutants.

This work used a double approach for the TSC sensing: a) screen-printed (SPE) electrochemical platform for on-site application, modified with lanthanum iron oxide and graphitic carbon nitride composite (LaFeO3/Fe2O3@g-C3N4/SPE); and b) carbon paste electrode (CPE), modified with the same material and used in laboratory conditions. Linear range from 0.1 μM to 10 μM, the limit of detection (LOD) of 29 nM and the limit of quantification (LOQ) of 91 nM were obtained for CP electrode in BRBS pH 8. SPE showed the best analytical parameters in BRBS at pH 3, with a linear range from 0.3 μM to 7 μM, LOD of 0.09 μM and LOQ of 0.28 μM. Furthermore, the influence of potential interferents was investigated and proven to be negligible. Determination of TSC was performed to estimate the environmental impact of this compound as well as the practical usefulness of the proposed sensor in the real sample analysis, confirmed with a HPLC analysis.",
publisher = "Elsevier",
journal = "Science of The Total Environment",
title = "The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan",
number = "857",
pages = "159250",
doi = "10.1016/j.scitotenv.2022.159250"
}

Knežević, S., Ostojić, J., Ognjanović, M., Savić, S. D., Kovačević, A., Manojlović, D. D., Stanković, V.,& Stanković, D.. (2023). The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan. in Science of The Total Environment
Elsevier.(857), 159250.
https://doi.org/10.1016/j.scitotenv.2022.159250

Knežević S, Ostojić J, Ognjanović M, Savić SD, Kovačević A, Manojlović DD, Stanković V, Stanković D. The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan. in Science of The Total Environment. 2023;(857):159250.
doi:10.1016/j.scitotenv.2022.159250 .

Knežević, Sara, Ostojić, Jelena, Ognjanović, Miloš, Savić, Slađana D., Kovačević, Aleksandra, Manojlović, Dragan D., Stanković, Vesna, Stanković, Dalibor, "The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan" in Science of The Total Environment, no. 857 (2023):159250,
https://doi.org/10.1016/j.scitotenv.2022.159250 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Ostojić, Jelena
AU  - Ognjanović, Miloš
AU  - Savić, Slađana D.
AU  - Kovačević, Aleksandra
AU  - Manojlović, Dragan D.
AU  - Stanković, Vesna
AU  - Stanković, Dalibor
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5775
AB  - Triclosan (TCS) is a polychlorinated phenoxy phenol (PCPPs) used as a disinfectant and a broad-spectrum antibacterial and antifungal agent in personal hygiene products. TCS easily forms diphenyl ethers and dioxins, which are persistent organic pollutants.This work used a double approach for the TSC sensing: a) screen-printed (SPE) electrochemical platform for on-site application, modified with lanthanum iron oxide and graphitic carbon nitride composite (LaFeO3/Fe2O3@g-C3N4/SPE); and b) carbon paste electrode (CPE), modified with the same material and used in laboratory conditions. Linear range from 0.1 μM to 10 μM, the limit of detection (LOD) of 29 nM and the limit of quantification (LOQ) of 91 nM were obtained for CP electrode in BRBS pH 8. SPE showed the best analytical parameters in BRBS at pH 3, with a linear range from 0.3 μM to 7 μM, LOD of 0.09 μM and LOQ of 0.28 μM. Furthermore, the influence of potential interferents was investigated and proven to be negligible. Determination of TSC was performed to estimate the environmental impact of this compound as well as the practical usefulness of the proposed sensor in the real sample analysis, confirmed with a HPLC analysis.
PB  - Elsevier
T2  - Science of The Total Environment
T1  - The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan
IS  - 857
SP  - 159250
DO  - 10.1016/j.scitotenv.2022.159250
ER  - 

@article{
author = "Knežević, Sara and Ostojić, Jelena and Ognjanović, Miloš and Savić, Slađana D. and Kovačević, Aleksandra and Manojlović, Dragan D. and Stanković, Vesna and Stanković, Dalibor",
year = "2023",
abstract = "Triclosan (TCS) is a polychlorinated phenoxy phenol (PCPPs) used as a disinfectant and a broad-spectrum antibacterial and antifungal agent in personal hygiene products. TCS easily forms diphenyl ethers and dioxins, which are persistent organic pollutants.This work used a double approach for the TSC sensing: a) screen-printed (SPE) electrochemical platform for on-site application, modified with lanthanum iron oxide and graphitic carbon nitride composite (LaFeO3/Fe2O3@g-C3N4/SPE); and b) carbon paste electrode (CPE), modified with the same material and used in laboratory conditions. Linear range from 0.1 μM to 10 μM, the limit of detection (LOD) of 29 nM and the limit of quantification (LOQ) of 91 nM were obtained for CP electrode in BRBS pH 8. SPE showed the best analytical parameters in BRBS at pH 3, with a linear range from 0.3 μM to 7 μM, LOD of 0.09 μM and LOQ of 0.28 μM. Furthermore, the influence of potential interferents was investigated and proven to be negligible. Determination of TSC was performed to estimate the environmental impact of this compound as well as the practical usefulness of the proposed sensor in the real sample analysis, confirmed with a HPLC analysis.",
publisher = "Elsevier",
journal = "Science of The Total Environment",
title = "The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan",
number = "857",
pages = "159250",
doi = "10.1016/j.scitotenv.2022.159250"
}

Knežević, S., Ostojić, J., Ognjanović, M., Savić, S. D., Kovačević, A., Manojlović, D. D., Stanković, V.,& Stanković, D.. (2023). The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan. in Science of The Total Environment
Elsevier.(857), 159250.
https://doi.org/10.1016/j.scitotenv.2022.159250

Knežević S, Ostojić J, Ognjanović M, Savić SD, Kovačević A, Manojlović DD, Stanković V, Stanković D. The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan. in Science of The Total Environment. 2023;(857):159250.
doi:10.1016/j.scitotenv.2022.159250 .

Knežević, Sara, Ostojić, Jelena, Ognjanović, Miloš, Savić, Slađana D., Kovačević, Aleksandra, Manojlović, Dragan D., Stanković, Vesna, Stanković, Dalibor, "The environmentally friendly approaches based on the heterojunction interface of the LaFeO3/Fe2O3@g-C3N4 composite for the disposable and laboratory sensing of triclosan" in Science of The Total Environment, no. 857 (2023):159250,
https://doi.org/10.1016/j.scitotenv.2022.159250 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Jovanović, Nataša Terzić
AU  - Vlahović, Filip
AU  - Ajdačić, Vladimir
AU  - Costache, Vlad
AU  - Vidić, Jasmina
AU  - Opsenica, Igor
AU  - Stanković, Dalibor
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6348
AB  - Covalent organic frameworks (COFs) are emerging as promising sensing materials due to their controllable structure and function properties, as well as excellent physicochemical characteristics. Here, specific interactions between a triazine-based COF and a mass-used herbicide – glyphosate (GLY) have been utilized to design a disposable sensing platform for GLY detection. This herbicide has been extensively used for decades, however, its harmful environmental impact and toxicity to humans have been recently proven, conditioning the necessity for the strict control and monitoring of its use and its presence in soil, water, and food. Glyphosate is an organophosphorus compound, and its detection in complex matrices usually requires laborious pretreatment. Here, we developed a direct, miniaturized, robust, and green approach for disposable electrochemical sensing of glyphosate, utilizing COF's ability to selectively capture and concentrate negatively charged glyphosate molecules inside its nanopores. This process generates the concentration gradient of GLY, accelerating its diffusion towards the electrode surface. Simultaneously, specific COF-glyphosate binding catalyses the oxidative cleavage of the C–P bond and, together with pore nanoconfinement, enables sensitive glyphosate detection. Detailed sensing principles and selectiveness were scrutinized using DFT-based modelling. The proposed electrochemical method has a linear working range from 0.1 μM to 10 μM, a low limit of detection of 96 nM, and a limit of quantification of 320 nM. The elaborated sensing approach is viable for use in real sample matrices and tested for GLY determination in soil and water samples, without pretreatment, preparation, or purification. The results showed the practical usefulness of the sensor in the real sample analysis and suggested its suitability for possible out-of-laboratory sensing.
PB  - Elsevier
T2  - Chemosphere
T1  - Direct glyphosate soil monitoring at the triazine-based covalent organic framework with the theoretical study of sensing principle
VL  - 341
SP  - 139930
DO  - 10.1016/j.chemosphere.2023.139930
ER  - 

@article{
author = "Knežević, Sara and Jovanović, Nataša Terzić and Vlahović, Filip and Ajdačić, Vladimir and Costache, Vlad and Vidić, Jasmina and Opsenica, Igor and Stanković, Dalibor",
year = "2023",
abstract = "Covalent organic frameworks (COFs) are emerging as promising sensing materials due to their controllable structure and function properties, as well as excellent physicochemical characteristics. Here, specific interactions between a triazine-based COF and a mass-used herbicide – glyphosate (GLY) have been utilized to design a disposable sensing platform for GLY detection. This herbicide has been extensively used for decades, however, its harmful environmental impact and toxicity to humans have been recently proven, conditioning the necessity for the strict control and monitoring of its use and its presence in soil, water, and food. Glyphosate is an organophosphorus compound, and its detection in complex matrices usually requires laborious pretreatment. Here, we developed a direct, miniaturized, robust, and green approach for disposable electrochemical sensing of glyphosate, utilizing COF's ability to selectively capture and concentrate negatively charged glyphosate molecules inside its nanopores. This process generates the concentration gradient of GLY, accelerating its diffusion towards the electrode surface. Simultaneously, specific COF-glyphosate binding catalyses the oxidative cleavage of the C–P bond and, together with pore nanoconfinement, enables sensitive glyphosate detection. Detailed sensing principles and selectiveness were scrutinized using DFT-based modelling. The proposed electrochemical method has a linear working range from 0.1 μM to 10 μM, a low limit of detection of 96 nM, and a limit of quantification of 320 nM. The elaborated sensing approach is viable for use in real sample matrices and tested for GLY determination in soil and water samples, without pretreatment, preparation, or purification. The results showed the practical usefulness of the sensor in the real sample analysis and suggested its suitability for possible out-of-laboratory sensing.",
publisher = "Elsevier",
journal = "Chemosphere",
title = "Direct glyphosate soil monitoring at the triazine-based covalent organic framework with the theoretical study of sensing principle",
volume = "341",
pages = "139930",
doi = "10.1016/j.chemosphere.2023.139930"
}

Knežević, S., Jovanović, N. T., Vlahović, F., Ajdačić, V., Costache, V., Vidić, J., Opsenica, I.,& Stanković, D.. (2023). Direct glyphosate soil monitoring at the triazine-based covalent organic framework with the theoretical study of sensing principle. in Chemosphere
Elsevier., 341, 139930.
https://doi.org/10.1016/j.chemosphere.2023.139930

Knežević S, Jovanović NT, Vlahović F, Ajdačić V, Costache V, Vidić J, Opsenica I, Stanković D. Direct glyphosate soil monitoring at the triazine-based covalent organic framework with the theoretical study of sensing principle. in Chemosphere. 2023;341:139930.
doi:10.1016/j.chemosphere.2023.139930 .

Knežević, Sara, Jovanović, Nataša Terzić, Vlahović, Filip, Ajdačić, Vladimir, Costache, Vlad, Vidić, Jasmina, Opsenica, Igor, Stanković, Dalibor, "Direct glyphosate soil monitoring at the triazine-based covalent organic framework with the theoretical study of sensing principle" in Chemosphere, 341 (2023):139930,
https://doi.org/10.1016/j.chemosphere.2023.139930 . .

TY  - JOUR
AU  - Milikić, Jadranka
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Stanković, Dalibor
AU  - Rakočević, Lazar
AU  - Šljukić, Biljana
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6250
AB  - Porous cobalt (III) oxide (Co3O4) and mixed cobalt (III) oxide - tin oxide (Co3O4/SnO2) were prepared by a novel template-based hydrothermal method resulting in their spherical morphology as confirmed by thorough physico-chemical characterisation. Two oxides were systematically examined as bifunctional electrocatalysts for oxygen reduction (ORR) and evolution (OER) reaction in alkaline media by voltammetry with rotating disk electrode, electrochemical impedance spectroscopy, and chronoamperometry. Low-cost Co3O4 and Co3O4/SnO2 electrocatalysts showed excellent ORR performance with low onset and half-wave potential, low Tafel slope, and the number of exchange electrons near 4, comparable to the commercial Pt/C electrocatalyst. Low OER onset potential of 1.52 and 1.57 V was observed for Co3O4 and Co3O4/SnO2, respectively, with low charge transfer resistance under anodic polarization conditions. Finally, to test bifunctional activity and durability of the two electrocatalyst, switch OER/ORR test was carried out.
PB  - Elsevier
T2  - International Journal of Hydrogen EnergyInternational Journal of Hydrogen Energy
T1  - Template-based synthesis of Co3O4 and Co3O4/SnO2 bifunctional catalysts with enhanced electrocatalytic properties for reversible oxygen evolution and reduction reaction
VL  - 48
IS  - 71
SP  - 27568
EP  - 27581
DO  - 10.1016/j.ijhydene.2023.03.433
ER  - 

@article{
author = "Milikić, Jadranka and Knežević, Sara and Ognjanović, Miloš and Stanković, Dalibor and Rakočević, Lazar and Šljukić, Biljana",
year = "2023",
abstract = "Porous cobalt (III) oxide (Co3O4) and mixed cobalt (III) oxide - tin oxide (Co3O4/SnO2) were prepared by a novel template-based hydrothermal method resulting in their spherical morphology as confirmed by thorough physico-chemical characterisation. Two oxides were systematically examined as bifunctional electrocatalysts for oxygen reduction (ORR) and evolution (OER) reaction in alkaline media by voltammetry with rotating disk electrode, electrochemical impedance spectroscopy, and chronoamperometry. Low-cost Co3O4 and Co3O4/SnO2 electrocatalysts showed excellent ORR performance with low onset and half-wave potential, low Tafel slope, and the number of exchange electrons near 4, comparable to the commercial Pt/C electrocatalyst. Low OER onset potential of 1.52 and 1.57 V was observed for Co3O4 and Co3O4/SnO2, respectively, with low charge transfer resistance under anodic polarization conditions. Finally, to test bifunctional activity and durability of the two electrocatalyst, switch OER/ORR test was carried out.",
publisher = "Elsevier",
journal = "International Journal of Hydrogen EnergyInternational Journal of Hydrogen Energy",
title = "Template-based synthesis of Co3O4 and Co3O4/SnO2 bifunctional catalysts with enhanced electrocatalytic properties for reversible oxygen evolution and reduction reaction",
volume = "48",
number = "71",
pages = "27568-27581",
doi = "10.1016/j.ijhydene.2023.03.433"
}

Milikić, J., Knežević, S., Ognjanović, M., Stanković, D., Rakočević, L.,& Šljukić, B.. (2023). Template-based synthesis of Co3O4 and Co3O4/SnO2 bifunctional catalysts with enhanced electrocatalytic properties for reversible oxygen evolution and reduction reaction. in International Journal of Hydrogen EnergyInternational Journal of Hydrogen Energy
Elsevier., 48(71), 27568-27581.
https://doi.org/10.1016/j.ijhydene.2023.03.433

Milikić J, Knežević S, Ognjanović M, Stanković D, Rakočević L, Šljukić B. Template-based synthesis of Co3O4 and Co3O4/SnO2 bifunctional catalysts with enhanced electrocatalytic properties for reversible oxygen evolution and reduction reaction. in International Journal of Hydrogen EnergyInternational Journal of Hydrogen Energy. 2023;48(71):27568-27581.
doi:10.1016/j.ijhydene.2023.03.433 .

Milikić, Jadranka, Knežević, Sara, Ognjanović, Miloš, Stanković, Dalibor, Rakočević, Lazar, Šljukić, Biljana, "Template-based synthesis of Co3O4 and Co3O4/SnO2 bifunctional catalysts with enhanced electrocatalytic properties for reversible oxygen evolution and reduction reaction" in International Journal of Hydrogen EnergyInternational Journal of Hydrogen Energy, 48, no. 71 (2023):27568-27581,
https://doi.org/10.1016/j.ijhydene.2023.03.433 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Dojčinović, Biljana P.
AU  - Antić, Bratislav
AU  - Vraneš-Đurić, Sanja
AU  - Manojlović, Dragan D.
AU  - Stanković, Dalibor
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10055
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4834
AB  - Honokiol is neolignan present in the magnolia bark. It displays versatile pharmacological properties—neuroprotective and anxiolytic effect, anti-cancer activity and antimicrobial effect being the most important. This paper aims to develop a voltammetric non-enzymatic biosensor for honokiol detection, quantification and monitoring in drugs and cosmetic products. The materials used in this study were synthesized and characterized by HR-XRPD, SEM, ATR-FTIR and electrochemical methods. Bi2O3, being a p-type semiconductor, was used as an electrode material. Both its semiconductivity and electrocatalytic properties result from lattice structure defects, which differ on the surface and in the bulk of the bismuth oxide crystal, and therefore are crystal size dependent. The influence of the particle size of Bi2O3 on its electrocatalytic properties was studied, and it was confirmed that Bi2O3 nanoparticles have better overall conductive/resistive and catalytic characteristics than microribbons and that the optimal electrode modification for sensing application was obtained by Bi2O3@SWCNT composite material preparation. Here, we established a sensitive electrochemical sensing platform for honokiol detection based on CP electrode modified with bismuth oxide nanoparticles and SWCNT with the 0.17 μM limit of detection, and linear operating range from 0.1 to 50 μM. The effect of potential interferents on honokiol detection was explored. Obtained results in the interference tests and the real sample analysis suggest that the developed approach is selective, accurate and reproducible. Due to the low detection limit and a wide working range, the proposed sensing platform opens great opportunities for further construction of sensors for honokiol detection and monitoring in the pharmaceutical industry and medicinal chemistry.
T2  - Food Analytical Methods
T1  - Sensing Platform Based on Carbon Paste Electrode Modified with Bismuth Oxide Nanoparticles and SWCNT for Submicromolar Quantification of Honokiol
VL  - 15
IS  - 4
SP  - 856
EP  - 867
DO  - 10.1007/s12161-021-02174-2
ER  - 

@article{
author = "Knežević, Sara and Ognjanović, Miloš and Dojčinović, Biljana P. and Antić, Bratislav and Vraneš-Đurić, Sanja and Manojlović, Dragan D. and Stanković, Dalibor",
year = "2022",
abstract = "Honokiol is neolignan present in the magnolia bark. It displays versatile pharmacological properties—neuroprotective and anxiolytic effect, anti-cancer activity and antimicrobial effect being the most important. This paper aims to develop a voltammetric non-enzymatic biosensor for honokiol detection, quantification and monitoring in drugs and cosmetic products. The materials used in this study were synthesized and characterized by HR-XRPD, SEM, ATR-FTIR and electrochemical methods. Bi2O3, being a p-type semiconductor, was used as an electrode material. Both its semiconductivity and electrocatalytic properties result from lattice structure defects, which differ on the surface and in the bulk of the bismuth oxide crystal, and therefore are crystal size dependent. The influence of the particle size of Bi2O3 on its electrocatalytic properties was studied, and it was confirmed that Bi2O3 nanoparticles have better overall conductive/resistive and catalytic characteristics than microribbons and that the optimal electrode modification for sensing application was obtained by Bi2O3@SWCNT composite material preparation. Here, we established a sensitive electrochemical sensing platform for honokiol detection based on CP electrode modified with bismuth oxide nanoparticles and SWCNT with the 0.17 μM limit of detection, and linear operating range from 0.1 to 50 μM. The effect of potential interferents on honokiol detection was explored. Obtained results in the interference tests and the real sample analysis suggest that the developed approach is selective, accurate and reproducible. Due to the low detection limit and a wide working range, the proposed sensing platform opens great opportunities for further construction of sensors for honokiol detection and monitoring in the pharmaceutical industry and medicinal chemistry.",
journal = "Food Analytical Methods",
title = "Sensing Platform Based on Carbon Paste Electrode Modified with Bismuth Oxide Nanoparticles and SWCNT for Submicromolar Quantification of Honokiol",
volume = "15",
number = "4",
pages = "856-867",
doi = "10.1007/s12161-021-02174-2"
}

Knežević, S., Ognjanović, M., Dojčinović, B. P., Antić, B., Vraneš-Đurić, S., Manojlović, D. D.,& Stanković, D.. (2022). Sensing Platform Based on Carbon Paste Electrode Modified with Bismuth Oxide Nanoparticles and SWCNT for Submicromolar Quantification of Honokiol. in Food Analytical Methods, 15(4), 856-867.
https://doi.org/10.1007/s12161-021-02174-2

Knežević S, Ognjanović M, Dojčinović BP, Antić B, Vraneš-Đurić S, Manojlović DD, Stanković D. Sensing Platform Based on Carbon Paste Electrode Modified with Bismuth Oxide Nanoparticles and SWCNT for Submicromolar Quantification of Honokiol. in Food Analytical Methods. 2022;15(4):856-867.
doi:10.1007/s12161-021-02174-2 .

Knežević, Sara, Ognjanović, Miloš, Dojčinović, Biljana P., Antić, Bratislav, Vraneš-Đurić, Sanja, Manojlović, Dragan D., Stanković, Dalibor, "Sensing Platform Based on Carbon Paste Electrode Modified with Bismuth Oxide Nanoparticles and SWCNT for Submicromolar Quantification of Honokiol" in Food Analytical Methods, 15, no. 4 (2022):856-867,
https://doi.org/10.1007/s12161-021-02174-2 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Gavrović-Jankulović, Marija
AU  - Đurašinović, Tatjana
AU  - Antić, Bratislav
AU  - Vranješ-Đurić, Sanja
AU  - Stanković, Dalibor
PY  - 2022
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4720
AB  - S-Adenosyl-L-Homocysteine (AdoHcy) is a crucial pathological factor in homocysteine-associated disorders. We developed an impedimetric approach for single drop S-Adenosyl-L-Homocysteine detection, based on S-Adenosyl-L-Homocysteine hydrolase (SAH), produced in the prokaryotic expression system (E. coli) by recombinant DNA technology, immobilized on citrate acid-coated gallium oxyhydroxide dispersed over single-walled carbon nanotubes (CA/GaO(OH)@SWCNT). The proposed biosensor offers detection of AdoHcy, with a limit of detection (LOD) of 0.17 μM. with operating linear range from 1 to 44 μM. The remarkable stability of gallium oxyhydroxide crystal was further improved by citric acid coating and its optical, electrical and physical anisotropy was skipped using SWCNTs.
PB  - Wiley
T2  - Electroanalysis
T1  - S-Adenosyl-L-Homocysteine Hydrolase Immobilized on Citric Acid-capped Gallium Oxyhydroxide on SWCNTs Modified Electrode for AdoHcy Impedimetric Sensing
VL  - 34
IS  - 1
SP  - 15
EP  - 24
DO  - 10.1002/elan.202100362
ER  - 

@article{
author = "Knežević, Sara and Ognjanović, Miloš and Gavrović-Jankulović, Marija and Đurašinović, Tatjana and Antić, Bratislav and Vranješ-Đurić, Sanja and Stanković, Dalibor",
year = "2022",
abstract = "S-Adenosyl-L-Homocysteine (AdoHcy) is a crucial pathological factor in homocysteine-associated disorders. We developed an impedimetric approach for single drop S-Adenosyl-L-Homocysteine detection, based on S-Adenosyl-L-Homocysteine hydrolase (SAH), produced in the prokaryotic expression system (E. coli) by recombinant DNA technology, immobilized on citrate acid-coated gallium oxyhydroxide dispersed over single-walled carbon nanotubes (CA/GaO(OH)@SWCNT). The proposed biosensor offers detection of AdoHcy, with a limit of detection (LOD) of 0.17 μM. with operating linear range from 1 to 44 μM. The remarkable stability of gallium oxyhydroxide crystal was further improved by citric acid coating and its optical, electrical and physical anisotropy was skipped using SWCNTs.",
publisher = "Wiley",
journal = "Electroanalysis",
title = "S-Adenosyl-L-Homocysteine Hydrolase Immobilized on Citric Acid-capped Gallium Oxyhydroxide on SWCNTs Modified Electrode for AdoHcy Impedimetric Sensing",
volume = "34",
number = "1",
pages = "15-24",
doi = "10.1002/elan.202100362"
}

Knežević, S., Ognjanović, M., Gavrović-Jankulović, M., Đurašinović, T., Antić, B., Vranješ-Đurić, S.,& Stanković, D.. (2022). S-Adenosyl-L-Homocysteine Hydrolase Immobilized on Citric Acid-capped Gallium Oxyhydroxide on SWCNTs Modified Electrode for AdoHcy Impedimetric Sensing. in Electroanalysis
Wiley., 34(1), 15-24.
https://doi.org/10.1002/elan.202100362

Knežević S, Ognjanović M, Gavrović-Jankulović M, Đurašinović T, Antić B, Vranješ-Đurić S, Stanković D. S-Adenosyl-L-Homocysteine Hydrolase Immobilized on Citric Acid-capped Gallium Oxyhydroxide on SWCNTs Modified Electrode for AdoHcy Impedimetric Sensing. in Electroanalysis. 2022;34(1):15-24.
doi:10.1002/elan.202100362 .

Knežević, Sara, Ognjanović, Miloš, Gavrović-Jankulović, Marija, Đurašinović, Tatjana, Antić, Bratislav, Vranješ-Đurić, Sanja, Stanković, Dalibor, "S-Adenosyl-L-Homocysteine Hydrolase Immobilized on Citric Acid-capped Gallium Oxyhydroxide on SWCNTs Modified Electrode for AdoHcy Impedimetric Sensing" in Electroanalysis, 34, no. 1 (2022):15-24,
https://doi.org/10.1002/elan.202100362 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Stanković, Vesna
AU  - Zlatanova, Milena
AU  - Nešić, Andrijana N.
AU  - Gavrović-Jankulović, Marija
AU  - Stanković, Dalibor
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5622
AB  - This paper aims to develop an amperometric, non-enzymatic sensor for detecting and quantifying UA as an alert signal induced by allergens with protease activity in human cell lines (HEK293 and HeLa). Uric acid (UA) has been classified as a damage-associated molecular pattern (DAMP) molecule that serves a physiological purpose inside the cell, while outside the cell it can be an indicator of cell damage. Cell damage or stress can be caused by different health problems or by environmental irritants, such as allergens. We can act and prevent the events that generate stress by determining the extent to which cells are under stress. Amperometric calibration measurements were performed with a carbon paste electrode modified with La(OH)3@MWCNT, at the potential of 0.3 V. The calibration curve was constructed in a linear operating range from 0.67 μM to 121 μM UA. The proposed sensor displayed good reproducibility with an RSD of 3.65% calculated for five subsequent measurements, and a low detection limit of 64.28 nM, determined using the 3 S/m method. Interference studies and the real sample analysis of allergen-treated cell lines proved that the proposed sensing platform possesses excellent sensitivity, reproducibility, and stability. Therefore, it can potentially be used to evaluate stress factors in medical research and clinical practice.
PB  - MDPI
T2  - Biosensors
T1  - La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells
VL  - 12
IS  - 9
SP  - 705
DO  - 10.3390/bios12090705
ER  - 

@article{
author = "Knežević, Sara and Ognjanović, Miloš and Stanković, Vesna and Zlatanova, Milena and Nešić, Andrijana N. and Gavrović-Jankulović, Marija and Stanković, Dalibor",
year = "2022",
abstract = "This paper aims to develop an amperometric, non-enzymatic sensor for detecting and quantifying UA as an alert signal induced by allergens with protease activity in human cell lines (HEK293 and HeLa). Uric acid (UA) has been classified as a damage-associated molecular pattern (DAMP) molecule that serves a physiological purpose inside the cell, while outside the cell it can be an indicator of cell damage. Cell damage or stress can be caused by different health problems or by environmental irritants, such as allergens. We can act and prevent the events that generate stress by determining the extent to which cells are under stress. Amperometric calibration measurements were performed with a carbon paste electrode modified with La(OH)3@MWCNT, at the potential of 0.3 V. The calibration curve was constructed in a linear operating range from 0.67 μM to 121 μM UA. The proposed sensor displayed good reproducibility with an RSD of 3.65% calculated for five subsequent measurements, and a low detection limit of 64.28 nM, determined using the 3 S/m method. Interference studies and the real sample analysis of allergen-treated cell lines proved that the proposed sensing platform possesses excellent sensitivity, reproducibility, and stability. Therefore, it can potentially be used to evaluate stress factors in medical research and clinical practice.",
publisher = "MDPI",
journal = "Biosensors",
title = "La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells",
volume = "12",
number = "9",
pages = "705",
doi = "10.3390/bios12090705"
}

Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A. N., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors
MDPI., 12(9), 705.
https://doi.org/10.3390/bios12090705

Knežević S, Ognjanović M, Stanković V, Zlatanova M, Nešić AN, Gavrović-Jankulović M, Stanković D. La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors. 2022;12(9):705.
doi:10.3390/bios12090705 .

Knežević, Sara, Ognjanović, Miloš, Stanković, Vesna, Zlatanova, Milena, Nešić, Andrijana N., Gavrović-Jankulović, Marija, Stanković, Dalibor, "La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells" in Biosensors, 12, no. 9 (2022):705,
https://doi.org/10.3390/bios12090705 . .

TY  - DATA
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Stanković, Vesna
AU  - Zlatanova, Milena
AU  - Nešić, Andrijana N.
AU  - Gavrović-Jankulović, Marija
AU  - Stanković, Dalibor
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5632
AB  - This paper aims to develop an amperometric, non-enzymatic sensor for detecting and quantifying UA as an alert signal induced by allergens with protease activity in human cell lines (HEK293 and HeLa). Uric acid (UA) has been classified as a damage-associated molecular pattern (DAMP) molecule that serves a physiological purpose inside the cell, while outside the cell it can be an indicator of cell damage. Cell damage or stress can be caused by different health problems or by environmental irritants, such as allergens. We can act and prevent the events that generate stress by determining the extent to which cells are under stress. Amperometric calibration measurements were performed with a carbon paste electrode modified with La(OH)3@MWCNT, at the potential of 0.3 V. The calibration curve was constructed in a linear operating range from 0.67 μM to 121 μM UA. The proposed sensor displayed good reproducibility with an RSD of 3.65% calculated for five subsequent measurements, and a low detection limit of 64.28 nM, determined using the 3 S/m method. Interference studies and the real sample analysis of allergen-treated cell lines proved that the proposed sensing platform possesses excellent sensitivity, reproducibility, and stability. Therefore, it can potentially be used to evaluate stress factors in medical research and clinical practice.
PB  - MDPI
T2  - Biosensors
T1  - Supplementary material for: Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors MDPI., 12(9), 705. https://doi.org/10.3390/bios12090705
VL  - 12
IS  - 9
SP  - 705
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5632
ER  - 

@misc{
author = "Knežević, Sara and Ognjanović, Miloš and Stanković, Vesna and Zlatanova, Milena and Nešić, Andrijana N. and Gavrović-Jankulović, Marija and Stanković, Dalibor",
year = "2022",
abstract = "This paper aims to develop an amperometric, non-enzymatic sensor for detecting and quantifying UA as an alert signal induced by allergens with protease activity in human cell lines (HEK293 and HeLa). Uric acid (UA) has been classified as a damage-associated molecular pattern (DAMP) molecule that serves a physiological purpose inside the cell, while outside the cell it can be an indicator of cell damage. Cell damage or stress can be caused by different health problems or by environmental irritants, such as allergens. We can act and prevent the events that generate stress by determining the extent to which cells are under stress. Amperometric calibration measurements were performed with a carbon paste electrode modified with La(OH)3@MWCNT, at the potential of 0.3 V. The calibration curve was constructed in a linear operating range from 0.67 μM to 121 μM UA. The proposed sensor displayed good reproducibility with an RSD of 3.65% calculated for five subsequent measurements, and a low detection limit of 64.28 nM, determined using the 3 S/m method. Interference studies and the real sample analysis of allergen-treated cell lines proved that the proposed sensing platform possesses excellent sensitivity, reproducibility, and stability. Therefore, it can potentially be used to evaluate stress factors in medical research and clinical practice.",
publisher = "MDPI",
journal = "Biosensors",
title = "Supplementary material for: Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors MDPI., 12(9), 705. https://doi.org/10.3390/bios12090705",
volume = "12",
number = "9",
pages = "705",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5632"
}

Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A. N., Gavrović-Jankulović, M.,& Stanković, D.. (2022). Supplementary material for: Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors MDPI., 12(9), 705. https://doi.org/10.3390/bios12090705. in Biosensors
MDPI., 12(9), 705.
https://hdl.handle.net/21.15107/rcub_cherry_5632

Knežević S, Ognjanović M, Stanković V, Zlatanova M, Nešić AN, Gavrović-Jankulović M, Stanković D. Supplementary material for: Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors MDPI., 12(9), 705. https://doi.org/10.3390/bios12090705. in Biosensors. 2022;12(9):705.
https://hdl.handle.net/21.15107/rcub_cherry_5632 .

Knežević, Sara, Ognjanović, Miloš, Stanković, Vesna, Zlatanova, Milena, Nešić, Andrijana N., Gavrović-Jankulović, Marija, Stanković, Dalibor, "Supplementary material for: Knežević, S., Ognjanović, M., Stanković, V., Zlatanova, M., Nešić, A., Gavrović-Jankulović, M.,& Stanković, D.. (2022). La(OH)3 Multi-Walled Carbon Nanotube/Carbon Paste-Based Sensing Approach for the Detection of Uric Acid—A Product of Environmentally Stressed Cells. in Biosensors MDPI., 12(9), 705. https://doi.org/10.3390/bios12090705" in Biosensors, 12, no. 9 (2022):705,
https://hdl.handle.net/21.15107/rcub_cherry_5632 .

TY  - JOUR
AU  - Milikić, Jadranka
AU  - Knežević, Sara
AU  - Stojadinović, Stevan
AU  - Alsaiari, Mabkhoot
AU  - Harraz, Farid A.
AU  - Santos, Diogo M. F.
AU  - Šljukić, Biljana
PY  - 2022
UR  - https://www.mdpi.com/2079-4991/12/15/2657
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5524
AB  - Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2).
PB  - MDPI
T2  - Nanomaterials
T1  - Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media
VL  - 12
IS  - 15
SP  - 2657
DO  - 10.3390/nano12152657
ER  - 

@article{
author = "Milikić, Jadranka and Knežević, Sara and Stojadinović, Stevan and Alsaiari, Mabkhoot and Harraz, Farid A. and Santos, Diogo M. F. and Šljukić, Biljana",
year = "2022",
abstract = "Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2).",
publisher = "MDPI",
journal = "Nanomaterials",
title = "Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media",
volume = "12",
number = "15",
pages = "2657",
doi = "10.3390/nano12152657"
}

Milikić, J., Knežević, S., Stojadinović, S., Alsaiari, M., Harraz, F. A., Santos, D. M. F.,& Šljukić, B.. (2022). Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media. in Nanomaterials
MDPI., 12(15), 2657.
https://doi.org/10.3390/nano12152657

Milikić J, Knežević S, Stojadinović S, Alsaiari M, Harraz FA, Santos DMF, Šljukić B. Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media. in Nanomaterials. 2022;12(15):2657.
doi:10.3390/nano12152657 .

Milikić, Jadranka, Knežević, Sara, Stojadinović, Stevan, Alsaiari, Mabkhoot, Harraz, Farid A., Santos, Diogo M. F., Šljukić, Biljana, "Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media" in Nanomaterials, 12, no. 15 (2022):2657,
https://doi.org/10.3390/nano12152657 . .

TY  - THES
AU  - Knežević, Sara
PY  - 2021
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4524
AB  - Honokiol je neolignan prisutan u kori drveta magnolije. Poseduje raznovrsne farmakološke osobine od kojih su najznačajnije neuroprotektivni i anksiolitički efekat, antikancerogena aktivnost i antimikrobni efekat. Cilj ovog istraživanja je razvoj voltametrijskog neenzimskog senzora za detekciju i kvantifikaciju honokiola, kao i praćenje njegove koncentracije u lekovima i kozmetičkim preparatima. Morfologija materijala sintetisanih u ovoj studiji je okarakterisana pomoću HR-XRPD, SEM, ATR-FTIR i elektrohemijskim metodama. Bi2O3, poluprovodnik p tipa, je korišćen kao elektrodni materijal. Njegova poluprovodljivost i elektrokatalitičke osobine su rezultat defekata u strukturi kristalne rešetke koji se razlikuju na površini i u unutrašnjosti kristala bizmut oksida, te stoga zavise od veličine kristala. Ispitan je uticaj veličine čestica Bi2O3 na njegove elektrokatalitičke osobine i potvrđeno je da nanočestice Bi2O3 imaju bolje provodne/otporne i katalitičke osobine od mikročestica i da je optimalna modifikacija elektrode za detekciju honokiola dobijena pripremom Bi2O3@SWCNT kompozitnog materijala. Limit detekcije ovakavog sistema, pri optimizovanim uslovima, je 0,17 μM, a opseg linearnosti metode je od 0,1 μM do 50 μM. Ispitan je uticaj potencijalnih interferirajućih vrsta na detekciju honokiola, kao i praktična upotrebljivost senzora za analizu realnih uzoraka čime je utvrđeno da razvijen pristup pokazuje veliku tačnost, selektivnost i reproduktivnost. Zahvaljujući niskoj granici detekcije i širokom radnom opsegu, predložena senzorska platforma otvara mogućnosti za konstrukciju senzora za detekciju i praćenje koncentracije honokiola u farmaceutskoj industriji i istraživanjima u medicinskoj hemiji.
T1  - Uticaj veličine čestica bizmut oksida na elektrokatalitičke osobine materijala
SP  - 1
EP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4524
ER  - 

@mastersthesis{
author = "Knežević, Sara",
year = "2021",
abstract = "Honokiol je neolignan prisutan u kori drveta magnolije. Poseduje raznovrsne farmakološke osobine od kojih su najznačajnije neuroprotektivni i anksiolitički efekat, antikancerogena aktivnost i antimikrobni efekat. Cilj ovog istraživanja je razvoj voltametrijskog neenzimskog senzora za detekciju i kvantifikaciju honokiola, kao i praćenje njegove koncentracije u lekovima i kozmetičkim preparatima. Morfologija materijala sintetisanih u ovoj studiji je okarakterisana pomoću HR-XRPD, SEM, ATR-FTIR i elektrohemijskim metodama. Bi2O3, poluprovodnik p tipa, je korišćen kao elektrodni materijal. Njegova poluprovodljivost i elektrokatalitičke osobine su rezultat defekata u strukturi kristalne rešetke koji se razlikuju na površini i u unutrašnjosti kristala bizmut oksida, te stoga zavise od veličine kristala. Ispitan je uticaj veličine čestica Bi2O3 na njegove elektrokatalitičke osobine i potvrđeno je da nanočestice Bi2O3 imaju bolje provodne/otporne i katalitičke osobine od mikročestica i da je optimalna modifikacija elektrode za detekciju honokiola dobijena pripremom Bi2O3@SWCNT kompozitnog materijala. Limit detekcije ovakavog sistema, pri optimizovanim uslovima, je 0,17 μM, a opseg linearnosti metode je od 0,1 μM do 50 μM. Ispitan je uticaj potencijalnih interferirajućih vrsta na detekciju honokiola, kao i praktična upotrebljivost senzora za analizu realnih uzoraka čime je utvrđeno da razvijen pristup pokazuje veliku tačnost, selektivnost i reproduktivnost. Zahvaljujući niskoj granici detekcije i širokom radnom opsegu, predložena senzorska platforma otvara mogućnosti za konstrukciju senzora za detekciju i praćenje koncentracije honokiola u farmaceutskoj industriji i istraživanjima u medicinskoj hemiji.",
title = "Uticaj veličine čestica bizmut oksida na elektrokatalitičke osobine materijala",
pages = "1-39",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4524"
}

Knežević, S.. (2021). Uticaj veličine čestica bizmut oksida na elektrokatalitičke osobine materijala. , 1-39.
https://hdl.handle.net/21.15107/rcub_cherry_4524

Knežević S. Uticaj veličine čestica bizmut oksida na elektrokatalitičke osobine materijala. 2021;:1-39.
https://hdl.handle.net/21.15107/rcub_cherry_4524 .

Knežević, Sara, "Uticaj veličine čestica bizmut oksida na elektrokatalitičke osobine materijala" (2021):1-39,
https://hdl.handle.net/21.15107/rcub_cherry_4524 .

TY  - JOUR
AU  - Ognjanović, Miloš
AU  - Stanković, Vesna
AU  - Knežević, Sara
AU  - Antić, Bratislav
AU  - Vranješ-Đurić, Sanja
AU  - Stanković, Dalibor
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4023
AB  - Herein, we proposed a novel approach and state-of-the-art technology for the improvement of the materials and enzyme immobilization at the electrode surface and construction of impedimetric glucose biosensor. We silanized titanium dioxide nanoparticles using (3-aminopropyl)triethoxysilane (APTES), for the preparation of cross-linked material nanoparticles, with carboxylic graphene. The silanization of titanium dioxide nanoparticles and an increase in electron shuttle was proven feasible when this composite was able to achieve about 30% higher current than non-silanized material. The proposed approach was used for the modification of the printed three-electrode system and the development of the impedimetric glucose biosensor. The material morphology and electrochemical characteristics were confirmed by spectroscopic and electrochemical methods. The present combination effectively modified the electrode surface and serve as a promising basis for the construction of Point-of-Care devices. Developed biosensor possesses wide operating linear range toward glucose detection from 50 µmol to 1000 µmol, with the limit of detection of 24 µmol. Finally, negligible interference effect and application in the real sample indicate that the proposed mechanism can be successfully applied to the assessment of glucose level in only one drop of real sample.
PB  - Elsevier
T2  - Microchemical Journal
T1  - TiO2/APTES cross-linked to carboxylic graphene based impedimetric glucose biosensor
VL  - 158
DO  - 10.1016/j.microc.2020.105150
ER  - 

@article{
author = "Ognjanović, Miloš and Stanković, Vesna and Knežević, Sara and Antić, Bratislav and Vranješ-Đurić, Sanja and Stanković, Dalibor",
year = "2020",
abstract = "Herein, we proposed a novel approach and state-of-the-art technology for the improvement of the materials and enzyme immobilization at the electrode surface and construction of impedimetric glucose biosensor. We silanized titanium dioxide nanoparticles using (3-aminopropyl)triethoxysilane (APTES), for the preparation of cross-linked material nanoparticles, with carboxylic graphene. The silanization of titanium dioxide nanoparticles and an increase in electron shuttle was proven feasible when this composite was able to achieve about 30% higher current than non-silanized material. The proposed approach was used for the modification of the printed three-electrode system and the development of the impedimetric glucose biosensor. The material morphology and electrochemical characteristics were confirmed by spectroscopic and electrochemical methods. The present combination effectively modified the electrode surface and serve as a promising basis for the construction of Point-of-Care devices. Developed biosensor possesses wide operating linear range toward glucose detection from 50 µmol to 1000 µmol, with the limit of detection of 24 µmol. Finally, negligible interference effect and application in the real sample indicate that the proposed mechanism can be successfully applied to the assessment of glucose level in only one drop of real sample.",
publisher = "Elsevier",
journal = "Microchemical Journal",
title = "TiO2/APTES cross-linked to carboxylic graphene based impedimetric glucose biosensor",
volume = "158",
doi = "10.1016/j.microc.2020.105150"
}

Ognjanović, M., Stanković, V., Knežević, S., Antić, B., Vranješ-Đurić, S.,& Stanković, D.. (2020). TiO2/APTES cross-linked to carboxylic graphene based impedimetric glucose biosensor. in Microchemical Journal
Elsevier., 158.
https://doi.org/10.1016/j.microc.2020.105150

Ognjanović M, Stanković V, Knežević S, Antić B, Vranješ-Đurić S, Stanković D. TiO2/APTES cross-linked to carboxylic graphene based impedimetric glucose biosensor. in Microchemical Journal. 2020;158.
doi:10.1016/j.microc.2020.105150 .

Ognjanović, Miloš, Stanković, Vesna, Knežević, Sara, Antić, Bratislav, Vranješ-Đurić, Sanja, Stanković, Dalibor, "TiO2/APTES cross-linked to carboxylic graphene based impedimetric glucose biosensor" in Microchemical Journal, 158 (2020),
https://doi.org/10.1016/j.microc.2020.105150 . .

TY  - JOUR
AU  - Knežević, Sara
AU  - Ognjanović, Miloš
AU  - Nedić, Nemanja
AU  - Mariano, José F.M.L.
AU  - Milanović, Zorana
AU  - Petković, Branka B.
AU  - Antić, Bratislav
AU  - Vranješ-Đurić, Sanja
AU  - Stanković, Dalibor
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3880
AB  - In order to ensure high food quality, one of the prime importance is the detection and quantification of histamine, well known marine food poison. In this work, we constructed novel electrochemical biosensor for the detection of histamine based on gold nanoparticles decorated on manganese dioxide (Au/MnO2) and used for modification of screen-printed carbon electrode (Au/MnO2@SPCE). The constructed sensor was then used for the estimation of histamine content in a single drop. Materials used in this study were synthesized and characterized using HR-TEM, XRPD and electrochemical methods. The amperometric detection method was optimized and, under selected operating parameters (supporting electrolyte pH 6, working potential of 1 V), the proposed sensor possesses linear working range from 0.3 µM to 5.1 µM, with a detection limit of 0.08 µM. The effect of selected interferences was investigated and it was found that the developed approach offers accurate, precise, selective, fast and reproducible quantification of histamine using only one drop of the sample. In the end, this work stands as a proof-of-concept of the modified electrodes and electrochemical detection as a promising and prospective approach for the applications in real-time monitoring of the food quality.
PB  - Elsevier
T2  - Microchemical Journal
T1  - A single drop histamine sensor based on AuNPs/MnO2 modified screen-printed electrode
VL  - 155
DO  - 10.1016/j.microc.2020.104778
ER  - 

@article{
author = "Knežević, Sara and Ognjanović, Miloš and Nedić, Nemanja and Mariano, José F.M.L. and Milanović, Zorana and Petković, Branka B. and Antić, Bratislav and Vranješ-Đurić, Sanja and Stanković, Dalibor",
year = "2020",
abstract = "In order to ensure high food quality, one of the prime importance is the detection and quantification of histamine, well known marine food poison. In this work, we constructed novel electrochemical biosensor for the detection of histamine based on gold nanoparticles decorated on manganese dioxide (Au/MnO2) and used for modification of screen-printed carbon electrode (Au/MnO2@SPCE). The constructed sensor was then used for the estimation of histamine content in a single drop. Materials used in this study were synthesized and characterized using HR-TEM, XRPD and electrochemical methods. The amperometric detection method was optimized and, under selected operating parameters (supporting electrolyte pH 6, working potential of 1 V), the proposed sensor possesses linear working range from 0.3 µM to 5.1 µM, with a detection limit of 0.08 µM. The effect of selected interferences was investigated and it was found that the developed approach offers accurate, precise, selective, fast and reproducible quantification of histamine using only one drop of the sample. In the end, this work stands as a proof-of-concept of the modified electrodes and electrochemical detection as a promising and prospective approach for the applications in real-time monitoring of the food quality.",
publisher = "Elsevier",
journal = "Microchemical Journal",
title = "A single drop histamine sensor based on AuNPs/MnO2 modified screen-printed electrode",
volume = "155",
doi = "10.1016/j.microc.2020.104778"
}

Knežević, S., Ognjanović, M., Nedić, N., Mariano, J. F.M.L., Milanović, Z., Petković, B. B., Antić, B., Vranješ-Đurić, S.,& Stanković, D.. (2020). A single drop histamine sensor based on AuNPs/MnO2 modified screen-printed electrode. in Microchemical Journal
Elsevier., 155.
https://doi.org/10.1016/j.microc.2020.104778

Knežević S, Ognjanović M, Nedić N, Mariano JF, Milanović Z, Petković BB, Antić B, Vranješ-Đurić S, Stanković D. A single drop histamine sensor based on AuNPs/MnO2 modified screen-printed electrode. in Microchemical Journal. 2020;155.
doi:10.1016/j.microc.2020.104778 .

Knežević, Sara, Ognjanović, Miloš, Nedić, Nemanja, Mariano, José F.M.L., Milanović, Zorana, Petković, Branka B., Antić, Bratislav, Vranješ-Đurić, Sanja, Stanković, Dalibor, "A single drop histamine sensor based on AuNPs/MnO2 modified screen-printed electrode" in Microchemical Journal, 155 (2020),
https://doi.org/10.1016/j.microc.2020.104778 . .

TY  - THES
AU  - Knežević, Sara
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4096
AB  - Hronična oboljenja karakteristična za stariju populaciju često su posledica povišenog nivoa homocisteina u telesnim tečnostima. Radi prevencije pojave bolesti neophodno je razviti brzu, jednostavnu i pouzdanu metodu za detekciju homocisteina, uz minimalnu prethodnu obradu uzorka. U ovom radu razvijen je nov pristup za impedimetrijsku detekciju homocisteina, baziran na upotrebi hidrolitičkog enzima S-Adenozil-L-Homocistein hidrolaza (SAH), koji je imobilisan na kompozitnom materijalu - nanočestice galijum oksida stabilizovane citratom i dispergovane na jednozidnim ugljeničnim nanocevima (CA/Ga2O3@SWCNTs). Kompozitni materijal je korišćen za modifikaciju površine štampane elektrode. Na taj način je dobijena selektivna, osetljiva i pouzdana patforma za detekciju homocisteina, sa granicom detekcije (LOD) 0.17 μM i linearnim radnim opegom od 1 do 44 μM. Stabilnost Ga2O3 je povećana oblaganjem citratima, a problem električne anizotropije prevaziđen građenjem kompozita sa jednozidnim ugljeničnim nanocevima (single walled carbon nanotubes - SWCNTs). Ovaj kompozit se pokazao kao stabilna podloga za imobilizaciju enzima. Karakterišu ga katalitičke osobine u reakciji prenosa elektrona i reakciji oksidacije homocisteina. Dobijen sistem nije podložan smetnjama koje potiču od interferenata iz biološkog matriksa, a sama elektroda poseduje veliku stabilnost i reproduktivnost. Praktična upotrebljivost senzora je dokazana izvođenjem merenja u realnim uzorcima. Predložen biosenzor predstavlja odličan alat za praćenje nivoa homocisteina, koji je pogodan za upotrebu u kliničkoj praksi i ima veliki potencijal za prevenciju pojave različitih i ozbiljnih oboljenja.
T1  - Impedimetrijski biosenzor za detekciju homocisteina baziran na S-Adenozil-L-Homocistein hidrolazi imobilisanoj na elektrodi modifikovanoj galijum oksidom i SWCNTs
SP  - 1
EP  - 28
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4096
ER  - 

@misc{
author = "Knežević, Sara",
year = "2020",
abstract = "Hronična oboljenja karakteristična za stariju populaciju često su posledica povišenog nivoa homocisteina u telesnim tečnostima. Radi prevencije pojave bolesti neophodno je razviti brzu, jednostavnu i pouzdanu metodu za detekciju homocisteina, uz minimalnu prethodnu obradu uzorka. U ovom radu razvijen je nov pristup za impedimetrijsku detekciju homocisteina, baziran na upotrebi hidrolitičkog enzima S-Adenozil-L-Homocistein hidrolaza (SAH), koji je imobilisan na kompozitnom materijalu - nanočestice galijum oksida stabilizovane citratom i dispergovane na jednozidnim ugljeničnim nanocevima (CA/Ga2O3@SWCNTs). Kompozitni materijal je korišćen za modifikaciju površine štampane elektrode. Na taj način je dobijena selektivna, osetljiva i pouzdana patforma za detekciju homocisteina, sa granicom detekcije (LOD) 0.17 μM i linearnim radnim opegom od 1 do 44 μM. Stabilnost Ga2O3 je povećana oblaganjem citratima, a problem električne anizotropije prevaziđen građenjem kompozita sa jednozidnim ugljeničnim nanocevima (single walled carbon nanotubes - SWCNTs). Ovaj kompozit se pokazao kao stabilna podloga za imobilizaciju enzima. Karakterišu ga katalitičke osobine u reakciji prenosa elektrona i reakciji oksidacije homocisteina. Dobijen sistem nije podložan smetnjama koje potiču od interferenata iz biološkog matriksa, a sama elektroda poseduje veliku stabilnost i reproduktivnost. Praktična upotrebljivost senzora je dokazana izvođenjem merenja u realnim uzorcima. Predložen biosenzor predstavlja odličan alat za praćenje nivoa homocisteina, koji je pogodan za upotrebu u kliničkoj praksi i ima veliki potencijal za prevenciju pojave različitih i ozbiljnih oboljenja.",
title = "Impedimetrijski biosenzor za detekciju homocisteina baziran na S-Adenozil-L-Homocistein hidrolazi imobilisanoj na elektrodi modifikovanoj galijum oksidom i SWCNTs",
pages = "1-28",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4096"
}

Knežević, S.. (2020). Impedimetrijski biosenzor za detekciju homocisteina baziran na S-Adenozil-L-Homocistein hidrolazi imobilisanoj na elektrodi modifikovanoj galijum oksidom i SWCNTs. , 1-28.
https://hdl.handle.net/21.15107/rcub_cherry_4096

Knežević S. Impedimetrijski biosenzor za detekciju homocisteina baziran na S-Adenozil-L-Homocistein hidrolazi imobilisanoj na elektrodi modifikovanoj galijum oksidom i SWCNTs. 2020;:1-28.
https://hdl.handle.net/21.15107/rcub_cherry_4096 .

Knežević, Sara, "Impedimetrijski biosenzor za detekciju homocisteina baziran na S-Adenozil-L-Homocistein hidrolazi imobilisanoj na elektrodi modifikovanoj galijum oksidom i SWCNTs" (2020):1-28,
https://hdl.handle.net/21.15107/rcub_cherry_4096 .