TY  - CONF
AU  - Rosić, Milena
AU  - Maksimović, Jelena
AU  - Senćanski, Jelena
AU  - Dodevski, Vladimir
AU  - Čebela, Maria
AU  - Simović-Pavlović, Marina
AU  - Pagnacco, Maja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11481
AB  - Cobalt molybdate is of importantce for the development of mobile telecommunication systems, such as mobile phones and high-quality microwave dielectric ceramics for high resonant frequency selectivity in microwave devices. Due to their special catalytic properties, cobalt molybdates have been used as catalysts in many chemical and petrochemical processes. The CoMoO4 nanoparticles ware synthetized in a simple, quick, and inexpensive way, by using a glycine nitrate procedure (GNP), with and without calcination at 450 °C [1], and investigated by applying the Briggs-Rauscher oscillatory reaction method [2]. The complex oscillatory BR reaction is sensitive to different insoluble analyte addition [3]. This feature of BR oscillatory reaction is used to investigate effect of different masses of GNP synthetized (with and without calcination at 450 °C) CoMoO4 samples on oscillatory dynamics. These two samples give the complete different effects in BR reaction. Obtained results strongly suggest that BR oscillatory reaction could be used for distinguishing these two samples, opening new direction in the investigation of ceramics materials.
PB  - Belgrade : University of Belgrade, Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade
T1  - Effect of CoMoO4 nanopowders synthesized by glycine nitrate procedure and calcinated at 450 °C on Briggs-Rauscher oscillatory dynamics
SP  - 120
EP  - 120
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11481
ER  - 

@conference{
author = "Rosić, Milena and Maksimović, Jelena and Senćanski, Jelena and Dodevski, Vladimir and Čebela, Maria and Simović-Pavlović, Marina and Pagnacco, Maja",
year = "2023",
abstract = "Cobalt molybdate is of importantce for the development of mobile telecommunication systems, such as mobile phones and high-quality microwave dielectric ceramics for high resonant frequency selectivity in microwave devices. Due to their special catalytic properties, cobalt molybdates have been used as catalysts in many chemical and petrochemical processes. The CoMoO4 nanoparticles ware synthetized in a simple, quick, and inexpensive way, by using a glycine nitrate procedure (GNP), with and without calcination at 450 °C [1], and investigated by applying the Briggs-Rauscher oscillatory reaction method [2]. The complex oscillatory BR reaction is sensitive to different insoluble analyte addition [3]. This feature of BR oscillatory reaction is used to investigate effect of different masses of GNP synthetized (with and without calcination at 450 °C) CoMoO4 samples on oscillatory dynamics. These two samples give the complete different effects in BR reaction. Obtained results strongly suggest that BR oscillatory reaction could be used for distinguishing these two samples, opening new direction in the investigation of ceramics materials.",
publisher = "Belgrade : University of Belgrade, Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade",
title = "Effect of CoMoO4 nanopowders synthesized by glycine nitrate procedure and calcinated at 450 °C on Briggs-Rauscher oscillatory dynamics",
pages = "120-120",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11481"
}

Rosić, M., Maksimović, J., Senćanski, J., Dodevski, V., Čebela, M., Simović-Pavlović, M.,& Pagnacco, M.. (2023). Effect of CoMoO4 nanopowders synthesized by glycine nitrate procedure and calcinated at 450 °C on Briggs-Rauscher oscillatory dynamics. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade
Belgrade : University of Belgrade, Institute for Multidisciplinary Research., 120-120.
https://hdl.handle.net/21.15107/rcub_vinar_11481

Rosić M, Maksimović J, Senćanski J, Dodevski V, Čebela M, Simović-Pavlović M, Pagnacco M. Effect of CoMoO4 nanopowders synthesized by glycine nitrate procedure and calcinated at 450 °C on Briggs-Rauscher oscillatory dynamics. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade. 2023;:120-120.
https://hdl.handle.net/21.15107/rcub_vinar_11481 .

Rosić, Milena, Maksimović, Jelena, Senćanski, Jelena, Dodevski, Vladimir, Čebela, Maria, Simović-Pavlović, Marina, Pagnacco, Maja, "Effect of CoMoO4 nanopowders synthesized by glycine nitrate procedure and calcinated at 450 °C on Briggs-Rauscher oscillatory dynamics" in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade (2023):120-120,
https://hdl.handle.net/21.15107/rcub_vinar_11481 .

TY  - CONF
AU  - Stevanović, Kristina
AU  - Maksimović, Jelena
AU  - Senćanski, Jelena
AU  - Pagnacco, Maja
AU  - Senćanski, Milan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12310
AB  - The organic pigments offer promising opportunities for developing new sustainable electrode materials for lithium batteries. Some of them have been identified as cathode material with very encouraging reversible lithium ion storage characteristics. One of them is a naturally occurring purpurin extracted from the Madder plant (Rubia tinctorum) for which we confirmed this good electrochemical behavior by cyclic voltammetry. One of the strategies towards obtaining materials with even better characteristics is a structural modification of already existing pigments. Building a theoretical model that could predict the redox properties of these new compounds can be very useful towards achieving that goal. In order to build a 3D QSAR (quantitative structure–activity relationship) model for material redox potential prediction, 9 organic pigments with known redox potentials were extracted from the literature. Based on molecular interaction field (MIF) probes we calculated standard GRIND (grid-independent) descriptors and constructed following principal PLS (partial least squares) model. By validation with the literature data, but also with the obtained experimental data for purpurin, this model proved very reliable in predicting the redox potential. A comparison was also made with the machine learning model that was formed in parallel.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - QSAR and machine learning models of redox potentials of some organic pigments
SP  - 35
EP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12310
ER  - 

@conference{
author = "Stevanović, Kristina and Maksimović, Jelena and Senćanski, Jelena and Pagnacco, Maja and Senćanski, Milan",
year = "2023",
abstract = "The organic pigments offer promising opportunities for developing new sustainable electrode materials for lithium batteries. Some of them have been identified as cathode material with very encouraging reversible lithium ion storage characteristics. One of them is a naturally occurring purpurin extracted from the Madder plant (Rubia tinctorum) for which we confirmed this good electrochemical behavior by cyclic voltammetry. One of the strategies towards obtaining materials with even better characteristics is a structural modification of already existing pigments. Building a theoretical model that could predict the redox properties of these new compounds can be very useful towards achieving that goal. In order to build a 3D QSAR (quantitative structure–activity relationship) model for material redox potential prediction, 9 organic pigments with known redox potentials were extracted from the literature. Based on molecular interaction field (MIF) probes we calculated standard GRIND (grid-independent) descriptors and constructed following principal PLS (partial least squares) model. By validation with the literature data, but also with the obtained experimental data for purpurin, this model proved very reliable in predicting the redox potential. A comparison was also made with the machine learning model that was formed in parallel.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "QSAR and machine learning models of redox potentials of some organic pigments",
pages = "35-35",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12310"
}

Stevanović, K., Maksimović, J., Senćanski, J., Pagnacco, M.,& Senćanski, M.. (2023). QSAR and machine learning models of redox potentials of some organic pigments. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12310

Stevanović K, Maksimović J, Senćanski J, Pagnacco M, Senćanski M. QSAR and machine learning models of redox potentials of some organic pigments. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12310 .

Stevanović, Kristina, Maksimović, Jelena, Senćanski, Jelena, Pagnacco, Maja, Senćanski, Milan, "QSAR and machine learning models of redox potentials of some organic pigments" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):35-35,
https://hdl.handle.net/21.15107/rcub_vinar_12310 .

TY  - JOUR
AU  - Pagnacco, Maja C.
AU  - Maksimović, Jelena P.
AU  - Nikolić, Nenad T.
AU  - Bajuk Bogdanović, Danica V.
AU  - Kragović, Milan M.
AU  - Stojmenović, Marija
AU  - Blagojević, Stevan N.
AU  - Senćanski, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10400
AB  - Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.).
T2  - Molecules
T1  - Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction
VL  - 27
IS  - 15
SP  - 4853
DO  - 10.3390/molecules27154853
ER  - 

@article{
author = "Pagnacco, Maja C. and Maksimović, Jelena P. and Nikolić, Nenad T. and Bajuk Bogdanović, Danica V. and Kragović, Milan M. and Stojmenović, Marija and Blagojević, Stevan N. and Senćanski, Jelena",
year = "2022",
abstract = "Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.).",
journal = "Molecules",
title = "Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction",
volume = "27",
number = "15",
pages = "4853",
doi = "10.3390/molecules27154853"
}

Pagnacco, M. C., Maksimović, J. P., Nikolić, N. T., Bajuk Bogdanović, D. V., Kragović, M. M., Stojmenović, M., Blagojević, S. N.,& Senćanski, J.. (2022). Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction. in Molecules, 27(15), 4853.
https://doi.org/10.3390/molecules27154853

Pagnacco MC, Maksimović JP, Nikolić NT, Bajuk Bogdanović DV, Kragović MM, Stojmenović M, Blagojević SN, Senćanski J. Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction. in Molecules. 2022;27(15):4853.
doi:10.3390/molecules27154853 .

Pagnacco, Maja C., Maksimović, Jelena P., Nikolić, Nenad T., Bajuk Bogdanović, Danica V., Kragović, Milan M., Stojmenović, Marija, Blagojević, Stevan N., Senćanski, Jelena, "Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction" in Molecules, 27, no. 15 (2022):4853,
https://doi.org/10.3390/molecules27154853 . .

TY  - JOUR
AU  - Maksimović, Tijana V.
AU  - Maksimović, Jelena P.
AU  - Tančić, Pavle I.
AU  - Potkonjak, Nebojša I.
AU  - Nedić, Zoran P.
AU  - Joksović, Ljubinka G.
AU  - Pagnacco, Maja C.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9878
AB  - The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.
T2  - Science of Sintering
T1  - A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response
VL  - 53
IS  - 2
SP  - 223
EP  - 235
DO  - 10.2298/SOS2102223M
ER  - 

@article{
author = "Maksimović, Tijana V. and Maksimović, Jelena P. and Tančić, Pavle I. and Potkonjak, Nebojša I. and Nedić, Zoran P. and Joksović, Ljubinka G. and Pagnacco, Maja C.",
year = "2021",
abstract = "The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.",
journal = "Science of Sintering",
title = "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response",
volume = "53",
number = "2",
pages = "223-235",
doi = "10.2298/SOS2102223M"
}

Maksimović, T. V., Maksimović, J. P., Tančić, P. I., Potkonjak, N. I., Nedić, Z. P., Joksović, L. G.,& Pagnacco, M. C.. (2021). A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering, 53(2), 223-235.
https://doi.org/10.2298/SOS2102223M

Maksimović TV, Maksimović JP, Tančić PI, Potkonjak NI, Nedić ZP, Joksović LG, Pagnacco MC. A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering. 2021;53(2):223-235.
doi:10.2298/SOS2102223M .

Maksimović, Tijana V., Maksimović, Jelena P., Tančić, Pavle I., Potkonjak, Nebojša I., Nedić, Zoran P., Joksović, Ljubinka G., Pagnacco, Maja C., "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response" in Science of Sintering, 53, no. 2 (2021):223-235,
https://doi.org/10.2298/SOS2102223M . .

TY  - CONF
AU  - Pešić, Ana
AU  - Joksimović, Danijela
AU  - Janković, Marija
AU  - Sarap, Nataša
AU  - Maksimović, Jelena
AU  - Pagnacco, Maja
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12584
AB  - Over the last few decades, heavy metal pollution has become an issue of great interest, primarily because of the potential human health risks. Contamination of seawater with heavy metals, and thus of marine species, is a direct consequence of urban and industrial pollution. Therefore, two fish samples Sardina pilchardus (S. pilchardus) collected from the Boka Kotorska Bay and the coastal part of the open sea on the Montenegrin coast were compared in terms of heavy metals: lead, mercury, copper and zinc concentration. Results show that metal concentrations in S. pilchardus samples in both sampling areas were lower than the maximum permitted concentrations defined by national and European legislation in fisheries and fish muscle tissue, meaning S. pilchardus obtained from the Boka Kotorska Bay and the coastal part of the open Adriatic Sea safe for human nutrition.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - 7th Workshop Specific Methods for Food Safety and Quality, September 22nd, 2021, Belgrade, Serbia, 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry
T1  - The Comparison of Heavy Metal Content of Sardina Pilchardus Species Collected from Bay and Open Adriatic Sea
SP  - 103
EP  - 106
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12584
ER  - 

@conference{
author = "Pešić, Ana and Joksimović, Danijela and Janković, Marija and Sarap, Nataša and Maksimović, Jelena and Pagnacco, Maja",
year = "2021",
abstract = "Over the last few decades, heavy metal pollution has become an issue of great interest, primarily because of the potential human health risks. Contamination of seawater with heavy metals, and thus of marine species, is a direct consequence of urban and industrial pollution. Therefore, two fish samples Sardina pilchardus (S. pilchardus) collected from the Boka Kotorska Bay and the coastal part of the open sea on the Montenegrin coast were compared in terms of heavy metals: lead, mercury, copper and zinc concentration. Results show that metal concentrations in S. pilchardus samples in both sampling areas were lower than the maximum permitted concentrations defined by national and European legislation in fisheries and fish muscle tissue, meaning S. pilchardus obtained from the Boka Kotorska Bay and the coastal part of the open Adriatic Sea safe for human nutrition.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "7th Workshop Specific Methods for Food Safety and Quality, September 22nd, 2021, Belgrade, Serbia, 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry",
title = "The Comparison of Heavy Metal Content of Sardina Pilchardus Species Collected from Bay and Open Adriatic Sea",
pages = "103-106",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12584"
}

Pešić, A., Joksimović, D., Janković, M., Sarap, N., Maksimović, J.,& Pagnacco, M.. (2021). The Comparison of Heavy Metal Content of Sardina Pilchardus Species Collected from Bay and Open Adriatic Sea. in 7th Workshop Specific Methods for Food Safety and Quality, September 22nd, 2021, Belgrade, Serbia, 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry
Belgrade : Vinča Institute of Nuclear Sciences., 103-106.
https://hdl.handle.net/21.15107/rcub_vinar_12584

Pešić A, Joksimović D, Janković M, Sarap N, Maksimović J, Pagnacco M. The Comparison of Heavy Metal Content of Sardina Pilchardus Species Collected from Bay and Open Adriatic Sea. in 7th Workshop Specific Methods for Food Safety and Quality, September 22nd, 2021, Belgrade, Serbia, 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry. 2021;:103-106.
https://hdl.handle.net/21.15107/rcub_vinar_12584 .

Pešić, Ana, Joksimović, Danijela, Janković, Marija, Sarap, Nataša, Maksimović, Jelena, Pagnacco, Maja, "The Comparison of Heavy Metal Content of Sardina Pilchardus Species Collected from Bay and Open Adriatic Sea" in 7th Workshop Specific Methods for Food Safety and Quality, September 22nd, 2021, Belgrade, Serbia, 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry (2021):103-106,
https://hdl.handle.net/21.15107/rcub_vinar_12584 .

TY  - JOUR
AU  - Pagnacco, Maja C.
AU  - Maksimović, Jelena P.
AU  - Potkonjak, Nebojša I.
AU  - Božić, Bojan D.
AU  - Horvath, Attila K.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1919
AB  - The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.
T2  - Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
T1  - Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior
VL  - 122
IS  - 2
SP  - 482
EP  - 491
DO  - 10.1021/acs.jpca.7b11774
ER  - 

@article{
author = "Pagnacco, Maja C. and Maksimović, Jelena P. and Potkonjak, Nebojša I. and Božić, Bojan D. and Horvath, Attila K.",
year = "2018",
abstract = "The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.",
journal = "Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory",
title = "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior",
volume = "122",
number = "2",
pages = "482-491",
doi = "10.1021/acs.jpca.7b11774"
}

Pagnacco, M. C., Maksimović, J. P., Potkonjak, N. I., Božić, B. D.,& Horvath, A. K.. (2018). Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122(2), 482-491.
https://doi.org/10.1021/acs.jpca.7b11774

Pagnacco MC, Maksimović JP, Potkonjak NI, Božić BD, Horvath AK. Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. 2018;122(2):482-491.
doi:10.1021/acs.jpca.7b11774 .

Pagnacco, Maja C., Maksimović, Jelena P., Potkonjak, Nebojša I., Božić, Bojan D., Horvath, Attila K., "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior" in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122, no. 2 (2018):482-491,
https://doi.org/10.1021/acs.jpca.7b11774 . .

TY  - JOUR
AU  - Pejić, Nataša
AU  - Kolar-Anić, Ljiljana
AU  - Maksimović, Jelena
AU  - Janković, Marija M.
AU  - Vukojević, Vladana
AU  - Anić, Slobodan
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1078
AB  - The temporal dynamics of the Bray-Liebhafsky reaction (iodate-based catalytic decomposition of hydrogen peroxide in an acidic aqueous solution) was experimentally characterized in a continuous stirred tank reactor by independently varying the temperature and the mixed inflow hydrogen peroxide concentration. When the temperature was the bifurcation parameter, the emergence/disappearance of oscillatory behavior via a supercritical Andronov-Hopf bifurcation was observed for different mixed inflow hydrogen peroxide concentrations. An increase in the mixed inflow hydrogen-peroxide concentration resulted in a shift of the bifurcation point towards higher values of temperature, but did not alter the bifurcation type.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Dynamic transitions in the Bray-Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation
VL  - 118
IS  - 1
SP  - 15
EP  - 26
DO  - 10.1007/s11144-016-0984-y
ER  - 

@article{
author = "Pejić, Nataša and Kolar-Anić, Ljiljana and Maksimović, Jelena and Janković, Marija M. and Vukojević, Vladana and Anić, Slobodan",
year = "2016",
abstract = "The temporal dynamics of the Bray-Liebhafsky reaction (iodate-based catalytic decomposition of hydrogen peroxide in an acidic aqueous solution) was experimentally characterized in a continuous stirred tank reactor by independently varying the temperature and the mixed inflow hydrogen peroxide concentration. When the temperature was the bifurcation parameter, the emergence/disappearance of oscillatory behavior via a supercritical Andronov-Hopf bifurcation was observed for different mixed inflow hydrogen peroxide concentrations. An increase in the mixed inflow hydrogen-peroxide concentration resulted in a shift of the bifurcation point towards higher values of temperature, but did not alter the bifurcation type.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Dynamic transitions in the Bray-Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation",
volume = "118",
number = "1",
pages = "15-26",
doi = "10.1007/s11144-016-0984-y"
}

Pejić, N., Kolar-Anić, L., Maksimović, J., Janković, M. M., Vukojević, V.,& Anić, S.. (2016). Dynamic transitions in the Bray-Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 118(1), 15-26.
https://doi.org/10.1007/s11144-016-0984-y

Pejić N, Kolar-Anić L, Maksimović J, Janković MM, Vukojević V, Anić S. Dynamic transitions in the Bray-Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation. in Reaction Kinetics, Mechanisms and Catalysis. 2016;118(1):15-26.
doi:10.1007/s11144-016-0984-y .

Pejić, Nataša, Kolar-Anić, Ljiljana, Maksimović, Jelena, Janković, Marija M., Vukojević, Vladana, Anić, Slobodan, "Dynamic transitions in the Bray-Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation" in Reaction Kinetics, Mechanisms and Catalysis, 118, no. 1 (2016):15-26,
https://doi.org/10.1007/s11144-016-0984-y . .

TY  - JOUR
AU  - Pejić, Nataša D.
AU  - Blagojević, Slavica M.
AU  - Sarap, Nataša
AU  - Maksimović, Jelena P.
AU  - Anić, SlobodanR.
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana Z.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5870
AB  - Perturbation of the BrayLiebhafsky non-oscillating subsystem (mixture of KIO3 and H2SO4), i.e., Dushman reaction (DR), by piroxicam (PX), was observed in an open reactor, i.e., in the continuously fed well-stirred tank reactor (CSTR). Monitoring the response of DR to perturbations by different concentrations of PX allows developing a simple procedure for quantitative determination of this analyte in both bulk drug and pharmaceutical preparation (injection). A tentative perturbation mechanism of PX action on the DR matrix, based on a kinetic scheme that was suggested by Agreda etal., is proposed. The PX reactivity in DR has been generally related to the reaction of PX with hypoiodous acid (HIO) present in the matrix.
T2  - Helvetica Chimica Acta
T1  - Perturbations of the Dushman Reaction with Piroxicam: Experimental and Model Calculations
VL  - 97
IS  - 1
SP  - 47
EP  - 55
DO  - 10.1002/hlca.201300109
ER  - 

@article{
author = "Pejić, Nataša D. and Blagojević, Slavica M. and Sarap, Nataša and Maksimović, Jelena P. and Anić, SlobodanR. and Čupić, Željko and Kolar-Anić, Ljiljana Z.",
year = "2014",
abstract = "Perturbation of the BrayLiebhafsky non-oscillating subsystem (mixture of KIO3 and H2SO4), i.e., Dushman reaction (DR), by piroxicam (PX), was observed in an open reactor, i.e., in the continuously fed well-stirred tank reactor (CSTR). Monitoring the response of DR to perturbations by different concentrations of PX allows developing a simple procedure for quantitative determination of this analyte in both bulk drug and pharmaceutical preparation (injection). A tentative perturbation mechanism of PX action on the DR matrix, based on a kinetic scheme that was suggested by Agreda etal., is proposed. The PX reactivity in DR has been generally related to the reaction of PX with hypoiodous acid (HIO) present in the matrix.",
journal = "Helvetica Chimica Acta",
title = "Perturbations of the Dushman Reaction with Piroxicam: Experimental and Model Calculations",
volume = "97",
number = "1",
pages = "47-55",
doi = "10.1002/hlca.201300109"
}

Pejić, N. D., Blagojević, S. M., Sarap, N., Maksimović, J. P., Anić, SlobodanR., Čupić, Ž.,& Kolar-Anić, L. Z.. (2014). Perturbations of the Dushman Reaction with Piroxicam: Experimental and Model Calculations. in Helvetica Chimica Acta, 97(1), 47-55.
https://doi.org/10.1002/hlca.201300109

Pejić ND, Blagojević SM, Sarap N, Maksimović JP, Anić S, Čupić Ž, Kolar-Anić LZ. Perturbations of the Dushman Reaction with Piroxicam: Experimental and Model Calculations. in Helvetica Chimica Acta. 2014;97(1):47-55.
doi:10.1002/hlca.201300109 .

Pejić, Nataša D., Blagojević, Slavica M., Sarap, Nataša, Maksimović, Jelena P., Anić, SlobodanR., Čupić, Željko, Kolar-Anić, Ljiljana Z., "Perturbations of the Dushman Reaction with Piroxicam: Experimental and Model Calculations" in Helvetica Chimica Acta, 97, no. 1 (2014):47-55,
https://doi.org/10.1002/hlca.201300109 . .

TY  - JOUR
AU  - Pejić, Nataša D.
AU  - Sarap, Nataša
AU  - Maksimović, Jelena P.
AU  - Anić, Slobodan R.
AU  - Kolar-Anić, Ljiljana Z.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5183
AB  - A simple and reliable novel kinetic method for the determination of piroxicam (PX) was proposed and validated. For quantitative determination of PX, the Bray-Liebhafsky (BL) oscillatory reaction was used in a stable non-equilibrium stationary state close to the bifurcation point. Under the optimized reaction conditions (T = 55.0A degrees C, [H2SO4](0) = 7.60x10(-2) mol L-1, [KIO3](0) = 5.90x10(-2) mol L-1, [H2O2](0) = 1.50x10(-1) mol L-1 and j (0) = 2.95x10(-2) min(-1)), the linear relationship between maximal potential shift Delta E (m) , and PX concentration was obtained in the concentration range 11.2-480.5 A mu g mL(-1) with a detection limit of 9.9 A mu g mL(-1). The method had a rather good sample throughput of 25 samples h(-1) with a precision RSD = 4.7% as well as recoveries RCV a parts per thousand currency sign 104.4%. Applicability of the proposed method to the direct determination of piroxicam in different pharmaceutical formulations (tablets, ampoules and gel) was demonstrated.
T2  - Central European Journal of Chemistry
T1  - Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system
VL  - 11
IS  - 2
SP  - 180
EP  - 188
DO  - 10.2478/s11532-012-0146-7
ER  - 

@article{
author = "Pejić, Nataša D. and Sarap, Nataša and Maksimović, Jelena P. and Anić, Slobodan R. and Kolar-Anić, Ljiljana Z.",
year = "2013",
abstract = "A simple and reliable novel kinetic method for the determination of piroxicam (PX) was proposed and validated. For quantitative determination of PX, the Bray-Liebhafsky (BL) oscillatory reaction was used in a stable non-equilibrium stationary state close to the bifurcation point. Under the optimized reaction conditions (T = 55.0A degrees C, [H2SO4](0) = 7.60x10(-2) mol L-1, [KIO3](0) = 5.90x10(-2) mol L-1, [H2O2](0) = 1.50x10(-1) mol L-1 and j (0) = 2.95x10(-2) min(-1)), the linear relationship between maximal potential shift Delta E (m) , and PX concentration was obtained in the concentration range 11.2-480.5 A mu g mL(-1) with a detection limit of 9.9 A mu g mL(-1). The method had a rather good sample throughput of 25 samples h(-1) with a precision RSD = 4.7% as well as recoveries RCV a parts per thousand currency sign 104.4%. Applicability of the proposed method to the direct determination of piroxicam in different pharmaceutical formulations (tablets, ampoules and gel) was demonstrated.",
journal = "Central European Journal of Chemistry",
title = "Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system",
volume = "11",
number = "2",
pages = "180-188",
doi = "10.2478/s11532-012-0146-7"
}

Pejić, N. D., Sarap, N., Maksimović, J. P., Anić, S. R.,& Kolar-Anić, L. Z.. (2013). Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system. in Central European Journal of Chemistry, 11(2), 180-188.
https://doi.org/10.2478/s11532-012-0146-7

Pejić ND, Sarap N, Maksimović JP, Anić SR, Kolar-Anić LZ. Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system. in Central European Journal of Chemistry. 2013;11(2):180-188.
doi:10.2478/s11532-012-0146-7 .

Pejić, Nataša D., Sarap, Nataša, Maksimović, Jelena P., Anić, Slobodan R., Kolar-Anić, Ljiljana Z., "Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system" in Central European Journal of Chemistry, 11, no. 2 (2013):180-188,
https://doi.org/10.2478/s11532-012-0146-7 . .