TY  - JOUR
AU  - Spasojevic, Pavle
AU  - Panic, Vesna
AU  - Seslija, Sanja
AU  - Nikolić, Vladimir
AU  - Popović, Ivanka G.
AU  - Veličković, Sava
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1992
AB  - The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties
VL  - 80
IS  - 9
SP  - 1177
DO  - 10.2298/JSC150123034S
ER  - 

@article{
author = "Spasojevic, Pavle and Panic, Vesna and Seslija, Sanja and Nikolić, Vladimir and Popović, Ivanka G. and Veličković, Sava",
year = "2015",
abstract = "The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties",
volume = "80",
number = "9",
pages = "1177",
doi = "10.2298/JSC150123034S"
}

Spasojevic, P., Panic, V., Seslija, S., Nikolić, V., Popović, I. G.,& Veličković, S.. (2015). Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(9), 1177.
https://doi.org/10.2298/JSC150123034S

Spasojevic P, Panic V, Seslija S, Nikolić V, Popović IG, Veličković S. Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society. 2015;80(9):1177.
doi:10.2298/JSC150123034S .

Spasojevic, Pavle, Panic, Vesna, Seslija, Sanja, Nikolić, Vladimir, Popović, Ivanka G., Veličković, Sava, "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties" in Journal of the Serbian Chemical Society, 80, no. 9 (2015):1177,
https://doi.org/10.2298/JSC150123034S . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1495
AB  - Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).
PB  - Springer, Dordrecht
T2  - Journal of Polymer Research
T1  - Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch
VL  - 21
IS  - 2
DO  - 10.1007/s10965-014-0363-1
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).",
publisher = "Springer, Dordrecht",
journal = "Journal of Polymer Research",
title = "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch",
volume = "21",
number = "2",
doi = "10.1007/s10965-014-0363-1"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research
Springer, Dordrecht., 21(2).
https://doi.org/10.1007/s10965-014-0363-1

Nikolić V, Veličković S, Popović AR. Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research. 2014;21(2).
doi:10.1007/s10965-014-0363-1 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch" in Journal of Polymer Research, 21, no. 2 (2014),
https://doi.org/10.1007/s10965-014-0363-1 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1831
AB  - Materials based on polystyrene and starch copolymers are used in food packaging, water pollution treatment, and textile industry, and their biodegradability is a desired characteristic. In order to examine the degradation patterns of modified, biodegradable derivates of polystyrene, which may keep its excellent technical features but be more environmentally friendly at the same time, polystyrene-graft-starch biomaterials obtained by emulsion polymerization in the presence of new type of initiator/activator pair (potassium persulfate/different amines) were subjected to 6-month biodegradation by burial method in three different types of commercially available soils: soil rich in humus and soil for cactus and orchid growing. Biodegradation was monitored by mass decrease, and the highest degradation rate was achieved in soil for cactus growing (81.30 %). Statistical analysis proved that microorganisms in different soil samples have different ability of biodegradation, and there is a significant negative correlation between the share of polystyrene in copolymer and degree of biodegradation. Grafting of polystyrene on starch on one hand prevents complete degradation of starch that is present (with maximal percentage of degraded starch ranging from 55 to 93 %), while on the other hand there is an upper limit of share of polystyrene in the copolymer (ranging from 37 to 77 %) that is preventing biodegradation of degradable part of copolymers.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Biodegradation of polystyrene-graft-starch copolymers in three different types of soil
VL  - 21
IS  - 16
SP  - 9877
EP  - 9886
DO  - 10.1007/s11356-014-2946-0
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Materials based on polystyrene and starch copolymers are used in food packaging, water pollution treatment, and textile industry, and their biodegradability is a desired characteristic. In order to examine the degradation patterns of modified, biodegradable derivates of polystyrene, which may keep its excellent technical features but be more environmentally friendly at the same time, polystyrene-graft-starch biomaterials obtained by emulsion polymerization in the presence of new type of initiator/activator pair (potassium persulfate/different amines) were subjected to 6-month biodegradation by burial method in three different types of commercially available soils: soil rich in humus and soil for cactus and orchid growing. Biodegradation was monitored by mass decrease, and the highest degradation rate was achieved in soil for cactus growing (81.30 %). Statistical analysis proved that microorganisms in different soil samples have different ability of biodegradation, and there is a significant negative correlation between the share of polystyrene in copolymer and degree of biodegradation. Grafting of polystyrene on starch on one hand prevents complete degradation of starch that is present (with maximal percentage of degraded starch ranging from 55 to 93 %), while on the other hand there is an upper limit of share of polystyrene in the copolymer (ranging from 37 to 77 %) that is preventing biodegradation of degradable part of copolymers.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Biodegradation of polystyrene-graft-starch copolymers in three different types of soil",
volume = "21",
number = "16",
pages = "9877-9886",
doi = "10.1007/s11356-014-2946-0"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Biodegradation of polystyrene-graft-starch copolymers in three different types of soil. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 21(16), 9877-9886.
https://doi.org/10.1007/s11356-014-2946-0

Nikolić V, Veličković S, Popović AR. Biodegradation of polystyrene-graft-starch copolymers in three different types of soil. in Environmental Science and Pollution Research. 2014;21(16):9877-9886.
doi:10.1007/s11356-014-2946-0 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Biodegradation of polystyrene-graft-starch copolymers in three different types of soil" in Environmental Science and Pollution Research, 21, no. 16 (2014):9877-9886,
https://doi.org/10.1007/s11356-014-2946-0 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
AU  - Popović, Aleksandar R.
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1425
AB  - In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established.
AB  - U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water
T1  - Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi
VL  - 78
IS  - 9
SP  - 1425
EP  - 1441
DO  - 10.2298/JSC121216051N
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Antonović, Dušan G. and Popović, Aleksandar R.",
year = "2013",
abstract = "In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established., U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water, Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi",
volume = "78",
number = "9",
pages = "1425-1441",
doi = "10.2298/JSC121216051N"
}

Nikolić, V., Veličković, S., Antonović, D. G.,& Popović, A. R.. (2013). Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 78(9), 1425-1441.
https://doi.org/10.2298/JSC121216051N

Nikolić V, Veličković S, Antonović DG, Popović AR. Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society. 2013;78(9):1425-1441.
doi:10.2298/JSC121216051N .

Nikolić, Vladimir, Veličković, Sava, Antonović, Dušan G., Popović, Aleksandar R., "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water" in Journal of the Serbian Chemical Society, 78, no. 9 (2013):1425-1441,
https://doi.org/10.2298/JSC121216051N . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2012
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1280
AB  - The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Amine activators influence on grafting reaction between methacrylic acid and starch
VL  - 88
IS  - 4
SP  - 1407
EP  - 1413
DO  - 10.1016/j.carbpol.2012.02.027
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2012",
abstract = "The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Amine activators influence on grafting reaction between methacrylic acid and starch",
volume = "88",
number = "4",
pages = "1407-1413",
doi = "10.1016/j.carbpol.2012.02.027"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2012). Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 88(4), 1407-1413.
https://doi.org/10.1016/j.carbpol.2012.02.027

Nikolić V, Veličković S, Popović AR. Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers. 2012;88(4):1407-1413.
doi:10.1016/j.carbpol.2012.02.027 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Amine activators influence on grafting reaction between methacrylic acid and starch" in Carbohydrate Polymers, 88, no. 4 (2012):1407-1413,
https://doi.org/10.1016/j.carbpol.2012.02.027 . .

TY  - DATA
AU  - Nešić, Aleksandra R.
AU  - Trifunović, Snežana S.
AU  - Grujić, Aleksandar S.
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2903
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Research
T1  - Supplementary data for the article: Nesic, A. R.; Trifunovic, S. S.; Grujic, A. S.; Velickovic, S. J.; Antonovic, D. G. Complexation of Amidated Pectin with Poly(Itaconic Acid) as a Polycarboxylic Polymer Model Compound. Carbohydrate Research 2011, 346 (15), 2463–2468. https://doi.org/10.1016/j.carres.2011.08.021
UR  - https://hdl.handle.net/21.15107/rcub_cherry_2903
ER  - 

@misc{
author = "Nešić, Aleksandra R. and Trifunović, Snežana S. and Grujić, Aleksandar S. and Veličković, Sava and Antonović, Dušan G.",
year = "2011",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Research",
title = "Supplementary data for the article: Nesic, A. R.; Trifunovic, S. S.; Grujic, A. S.; Velickovic, S. J.; Antonovic, D. G. Complexation of Amidated Pectin with Poly(Itaconic Acid) as a Polycarboxylic Polymer Model Compound. Carbohydrate Research 2011, 346 (15), 2463–2468. https://doi.org/10.1016/j.carres.2011.08.021",
url = "https://hdl.handle.net/21.15107/rcub_cherry_2903"
}

Nešić, A. R., Trifunović, S. S., Grujić, A. S., Veličković, S.,& Antonović, D. G.. (2011). Supplementary data for the article: Nesic, A. R.; Trifunovic, S. S.; Grujic, A. S.; Velickovic, S. J.; Antonovic, D. G. Complexation of Amidated Pectin with Poly(Itaconic Acid) as a Polycarboxylic Polymer Model Compound. Carbohydrate Research 2011, 346 (15), 2463–2468. https://doi.org/10.1016/j.carres.2011.08.021. in Carbohydrate Research
Elsevier Sci Ltd, Oxford..
https://hdl.handle.net/21.15107/rcub_cherry_2903

Nešić AR, Trifunović SS, Grujić AS, Veličković S, Antonović DG. Supplementary data for the article: Nesic, A. R.; Trifunovic, S. S.; Grujic, A. S.; Velickovic, S. J.; Antonovic, D. G. Complexation of Amidated Pectin with Poly(Itaconic Acid) as a Polycarboxylic Polymer Model Compound. Carbohydrate Research 2011, 346 (15), 2463–2468. https://doi.org/10.1016/j.carres.2011.08.021. in Carbohydrate Research. 2011;.
https://hdl.handle.net/21.15107/rcub_cherry_2903 .

Nešić, Aleksandra R., Trifunović, Snežana S., Grujić, Aleksandar S., Veličković, Sava, Antonović, Dušan G., "Supplementary data for the article: Nesic, A. R.; Trifunovic, S. S.; Grujic, A. S.; Velickovic, S. J.; Antonovic, D. G. Complexation of Amidated Pectin with Poly(Itaconic Acid) as a Polycarboxylic Polymer Model Compound. Carbohydrate Research 2011, 346 (15), 2463–2468. https://doi.org/10.1016/j.carres.2011.08.021" in Carbohydrate Research (2011),
https://hdl.handle.net/21.15107/rcub_cherry_2903 .

TY  - JOUR
AU  - Nešić, Aleksandra R.
AU  - Trifunović, Snežana S.
AU  - Grujić, Aleksandar S.
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1219
AB  - Complexes based on amidated pectin (AP) and poly(itaconic acid) (PIA) were prepared by casting films from solutions of AP and PIA in different ratios with the pectin amount ranging from 10% to 90% by mass. The complexes were investigated by elemental analysis, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetry (TG). In all investigated ratios of AP/PIA glassy transparent films with a uniform structure were obtained. The results of elemental analysis confirmed the composition of the complexes, and FTIR spectroscopy has shown carboxylic and amide peak shifting, indicating complex formation between AP and PIA. Comparison of thermograms of AP/PIA films with different ratios of AP indicated that the increase of the amount of AP increases the thermal stability of the films by retarding the onset of the main degradation processes.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Research
T1  - Complexation of amidated pectin with poly(itaconic acid) as a polycarboxylic polymer model compound
VL  - 346
IS  - 15
SP  - 2463
EP  - 2468
DO  - 10.1016/j.carres.2011.08.021
ER  - 

@article{
author = "Nešić, Aleksandra R. and Trifunović, Snežana S. and Grujić, Aleksandar S. and Veličković, Sava and Antonović, Dušan G.",
year = "2011",
abstract = "Complexes based on amidated pectin (AP) and poly(itaconic acid) (PIA) were prepared by casting films from solutions of AP and PIA in different ratios with the pectin amount ranging from 10% to 90% by mass. The complexes were investigated by elemental analysis, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetry (TG). In all investigated ratios of AP/PIA glassy transparent films with a uniform structure were obtained. The results of elemental analysis confirmed the composition of the complexes, and FTIR spectroscopy has shown carboxylic and amide peak shifting, indicating complex formation between AP and PIA. Comparison of thermograms of AP/PIA films with different ratios of AP indicated that the increase of the amount of AP increases the thermal stability of the films by retarding the onset of the main degradation processes.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Research",
title = "Complexation of amidated pectin with poly(itaconic acid) as a polycarboxylic polymer model compound",
volume = "346",
number = "15",
pages = "2463-2468",
doi = "10.1016/j.carres.2011.08.021"
}

Nešić, A. R., Trifunović, S. S., Grujić, A. S., Veličković, S.,& Antonović, D. G.. (2011). Complexation of amidated pectin with poly(itaconic acid) as a polycarboxylic polymer model compound. in Carbohydrate Research
Elsevier Sci Ltd, Oxford., 346(15), 2463-2468.
https://doi.org/10.1016/j.carres.2011.08.021

Nešić AR, Trifunović SS, Grujić AS, Veličković S, Antonović DG. Complexation of amidated pectin with poly(itaconic acid) as a polycarboxylic polymer model compound. in Carbohydrate Research. 2011;346(15):2463-2468.
doi:10.1016/j.carres.2011.08.021 .

Nešić, Aleksandra R., Trifunović, Snežana S., Grujić, Aleksandar S., Veličković, Sava, Antonović, Dušan G., "Complexation of amidated pectin with poly(itaconic acid) as a polycarboxylic polymer model compound" in Carbohydrate Research, 346, no. 15 (2011):2463-2468,
https://doi.org/10.1016/j.carres.2011.08.021 . .

TY  - JOUR
AU  - Polović, Natalija
AU  - Pjanovic, Rada V.
AU  - Burazer, Lidija M.
AU  - Veličković, Sava
AU  - Jankov, Ratko M.
AU  - Ćirković-Veličković, Tanja
PY  - 2009
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/592
AB  - BACKGROUND: It is thought that food sensitisers must be able to reach the intestine in order to sensitise patients. Pectin is a gel-forming plant polysaccharide that can protect allergens from in vivo gastric digestion and in vitro pepsin digestion. The aim of this study was to examine if pectin gel formed in the acidic environment of the stomach can protect labile allergen from in vitro gastrointestinal digestion. RESULTS: Pectin forms a gel in the acidic conditions of gastric fluid up to a concentration of 1.0 +/- 0.14 g L(-1). Four allergenic fruits (kiwi, cherry, apple and banana) form gels in the same manner at the dilutions 14.8 +/- 0.4; 8.4 +/- 0.2, 9.4 +/- 0.35 and 29.1 +/- 0.2, respectively. The time necessary for dissolution of 50 g L(-1) pectin gel in intestinal fluid was found to be 70 +/- 0.2 min. Pectin gel formed in situ was able to protect Act c 1 from pepsin digestion for 1 h and from further intestinal digestion for one additional hour. CONCLUSION: Pectin gel in an acidic environment protects Act c 1 from pepsin digestion and dissolves slowly in the slightly basic environment of the intestine allowing the survival of fruit allergen for additional time and possible interaction with the gut immune system. (C) 2008 Society of Chemical Industry
PB  - John Wiley & Sons Ltd, Chichester
T2  - Journal of the Science of Food and Agriculture
T1  - Acid-formed pectin gel delays major incomplete kiwi fruit allergen Act c 1 proteolysis in in vitro gastrointestinal digestion
VL  - 89
IS  - 1
SP  - 8
EP  - 14
DO  - 10.1002/jsfa.3404
ER  - 

@article{
author = "Polović, Natalija and Pjanovic, Rada V. and Burazer, Lidija M. and Veličković, Sava and Jankov, Ratko M. and Ćirković-Veličković, Tanja",
year = "2009",
abstract = "BACKGROUND: It is thought that food sensitisers must be able to reach the intestine in order to sensitise patients. Pectin is a gel-forming plant polysaccharide that can protect allergens from in vivo gastric digestion and in vitro pepsin digestion. The aim of this study was to examine if pectin gel formed in the acidic environment of the stomach can protect labile allergen from in vitro gastrointestinal digestion. RESULTS: Pectin forms a gel in the acidic conditions of gastric fluid up to a concentration of 1.0 +/- 0.14 g L(-1). Four allergenic fruits (kiwi, cherry, apple and banana) form gels in the same manner at the dilutions 14.8 +/- 0.4; 8.4 +/- 0.2, 9.4 +/- 0.35 and 29.1 +/- 0.2, respectively. The time necessary for dissolution of 50 g L(-1) pectin gel in intestinal fluid was found to be 70 +/- 0.2 min. Pectin gel formed in situ was able to protect Act c 1 from pepsin digestion for 1 h and from further intestinal digestion for one additional hour. CONCLUSION: Pectin gel in an acidic environment protects Act c 1 from pepsin digestion and dissolves slowly in the slightly basic environment of the intestine allowing the survival of fruit allergen for additional time and possible interaction with the gut immune system. (C) 2008 Society of Chemical Industry",
publisher = "John Wiley & Sons Ltd, Chichester",
journal = "Journal of the Science of Food and Agriculture",
title = "Acid-formed pectin gel delays major incomplete kiwi fruit allergen Act c 1 proteolysis in in vitro gastrointestinal digestion",
volume = "89",
number = "1",
pages = "8-14",
doi = "10.1002/jsfa.3404"
}

Polović, N., Pjanovic, R. V., Burazer, L. M., Veličković, S., Jankov, R. M.,& Ćirković-Veličković, T.. (2009). Acid-formed pectin gel delays major incomplete kiwi fruit allergen Act c 1 proteolysis in in vitro gastrointestinal digestion. in Journal of the Science of Food and Agriculture
John Wiley & Sons Ltd, Chichester., 89(1), 8-14.
https://doi.org/10.1002/jsfa.3404

Polović N, Pjanovic RV, Burazer LM, Veličković S, Jankov RM, Ćirković-Veličković T. Acid-formed pectin gel delays major incomplete kiwi fruit allergen Act c 1 proteolysis in in vitro gastrointestinal digestion. in Journal of the Science of Food and Agriculture. 2009;89(1):8-14.
doi:10.1002/jsfa.3404 .

Polović, Natalija, Pjanovic, Rada V., Burazer, Lidija M., Veličković, Sava, Jankov, Ratko M., Ćirković-Veličković, Tanja, "Acid-formed pectin gel delays major incomplete kiwi fruit allergen Act c 1 proteolysis in in vitro gastrointestinal digestion" in Journal of the Science of Food and Agriculture, 89, no. 1 (2009):8-14,
https://doi.org/10.1002/jsfa.3404 . .