Žekić, Andrijana

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  • Žekić, Andrijana (2)
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Author's Bibliography

Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity

Kop, Tatjana; Jakovljević, Dragica; Živković, Ljiljana; Žekić, Andrijana; Beškoski, Vladimir P.; Milić, Dragana; Gojgić-Cvijović, Gordana; Bjelaković, Mira

(2020)

TY  - JOUR
AU  - Kop, Tatjana
AU  - Jakovljević, Dragica
AU  - Živković, Ljiljana
AU  - Žekić, Andrijana
AU  - Beškoski, Vladimir P.
AU  - Milić, Dragana
AU  - Gojgić-Cvijović, Gordana
AU  - Bjelaković, Mira
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8789
AB  - An efficient encapsulation of the fullerene into two hydrophobized and one native polysaccharide provided water soluble supramolecular hybrids. After covalent modification of polysaccharides by cholesterol, noncovalent hybrids were prepared by a three-step procedure, including mixing of individual aqueous solutions of hydrophobized, as well as native sugar with solution of the fullerene in pyridine, dialysis and lyophilization. Although the degree of the fullerene incorporation into hydrophobized substrates, cholesterol-levan and cholesterol-pullulan, was lower in comparison to the native polysaccharide levan, hydrophobization provided nanoparticles with improved properties. The particle size distribution, studied by dynamic light scattering and scanning electron microscopy revealed formation of moderately polydisperse aggregates, with the diameter contraction in comparison to the corresponding free polysaccharide, especially in the case of hydrophobized substrates. The morphological examination, done by scanning electron microscopy indicated the self-organization of the fullerene-native polysaccharide to round individual structures, while fullerene-hydrophobized polysaccharide hybrids tend to form networks. The antioxidant activity of the synthesized polysaccharide-C60 noncovalent hybrids versus starting polysaccharides was investigated by the DPPH radical scavenging and the β-carotene-linoleic acid bleaching methods. In all three complexes, the radical scavenging ability of the fullerene remained preserved, and a positive effect of levan hydrophobization was observed.
T2  - European Polymer Journal
T1  - Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity
VL  - 123
SP  - 109461
DO  - 10.1016/j.eurpolymj.2019.109461
ER  - 
@article{
author = "Kop, Tatjana and Jakovljević, Dragica and Živković, Ljiljana and Žekić, Andrijana and Beškoski, Vladimir P. and Milić, Dragana and Gojgić-Cvijović, Gordana and Bjelaković, Mira",
year = "2020",
abstract = "An efficient encapsulation of the fullerene into two hydrophobized and one native polysaccharide provided water soluble supramolecular hybrids. After covalent modification of polysaccharides by cholesterol, noncovalent hybrids were prepared by a three-step procedure, including mixing of individual aqueous solutions of hydrophobized, as well as native sugar with solution of the fullerene in pyridine, dialysis and lyophilization. Although the degree of the fullerene incorporation into hydrophobized substrates, cholesterol-levan and cholesterol-pullulan, was lower in comparison to the native polysaccharide levan, hydrophobization provided nanoparticles with improved properties. The particle size distribution, studied by dynamic light scattering and scanning electron microscopy revealed formation of moderately polydisperse aggregates, with the diameter contraction in comparison to the corresponding free polysaccharide, especially in the case of hydrophobized substrates. The morphological examination, done by scanning electron microscopy indicated the self-organization of the fullerene-native polysaccharide to round individual structures, while fullerene-hydrophobized polysaccharide hybrids tend to form networks. The antioxidant activity of the synthesized polysaccharide-C60 noncovalent hybrids versus starting polysaccharides was investigated by the DPPH radical scavenging and the β-carotene-linoleic acid bleaching methods. In all three complexes, the radical scavenging ability of the fullerene remained preserved, and a positive effect of levan hydrophobization was observed.",
journal = "European Polymer Journal",
title = "Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity",
volume = "123",
pages = "109461",
doi = "10.1016/j.eurpolymj.2019.109461"
}
Kop, T., Jakovljević, D., Živković, L., Žekić, A., Beškoski, V. P., Milić, D., Gojgić-Cvijović, G.,& Bjelaković, M.. (2020). Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity. in European Polymer Journal, 123, 109461.
https://doi.org/10.1016/j.eurpolymj.2019.109461
Kop T, Jakovljević D, Živković L, Žekić A, Beškoski VP, Milić D, Gojgić-Cvijović G, Bjelaković M. Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity. in European Polymer Journal. 2020;123:109461.
doi:10.1016/j.eurpolymj.2019.109461 .
Kop, Tatjana, Jakovljević, Dragica, Živković, Ljiljana, Žekić, Andrijana, Beškoski, Vladimir P., Milić, Dragana, Gojgić-Cvijović, Gordana, Bjelaković, Mira, "Polysaccharide-fullerene supramolecular hybrids: Synthesis, characterization and antioxidant activity" in European Polymer Journal, 123 (2020):109461,
https://doi.org/10.1016/j.eurpolymj.2019.109461 . .
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Impact of plasma treatment on acoustic properties of natural cellulose materials

Pavlović, Sanja; Stanković, Snežana B.; Žekić, Andrijana; Nenadović, Miloš; Popović, Dušan M.; Milosavljević, Vladimir; Poparić, Goran B.

(2019)

TY  - JOUR
AU  - Pavlović, Sanja
AU  - Stanković, Snežana B.
AU  - Žekić, Andrijana
AU  - Nenadović, Miloš
AU  - Popović, Dušan M.
AU  - Milosavljević, Vladimir
AU  - Poparić, Goran B.
PY  - 2019
UR  - http://link.springer.com/10.1007/s10570-019-02547-1
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8338
AB  - Low-temperature plasma is widely used in many surface treatment technologies for modifications of the physical properties of different polymeric materials. In the present work, we have examined the modification of acoustical properties of natural cellulose materials (cotton, hemp) by the radio-frequency argon plasma. We have observed an increase of the sound absorption coefficient due to the plasma treatment for certain range of applied powers. An analysis of elementary processes which happened during plasma–material interaction was conducted. Additional analyses related to material characterizations were performed in order to resolve structural and chemical changes of plasma treated materials. The micro-mechanical modification of treated materials, which happened upon the retrieved structural and chemical changes, was related to the modification of its acoustical properties in order to explain the observed effect. Graphic abstract: [Figure not available: see fulltext.]. © 2019, Springer Nature B.V.
T2  - Cellulose
T1  - Impact of plasma treatment on acoustic properties of natural cellulose materials
VL  - 26
IS  - 11
SP  - 6543
EP  - 6554
DO  - 10.1007/s10570-019-02547-1
ER  - 
@article{
author = "Pavlović, Sanja and Stanković, Snežana B. and Žekić, Andrijana and Nenadović, Miloš and Popović, Dušan M. and Milosavljević, Vladimir and Poparić, Goran B.",
year = "2019",
abstract = "Low-temperature plasma is widely used in many surface treatment technologies for modifications of the physical properties of different polymeric materials. In the present work, we have examined the modification of acoustical properties of natural cellulose materials (cotton, hemp) by the radio-frequency argon plasma. We have observed an increase of the sound absorption coefficient due to the plasma treatment for certain range of applied powers. An analysis of elementary processes which happened during plasma–material interaction was conducted. Additional analyses related to material characterizations were performed in order to resolve structural and chemical changes of plasma treated materials. The micro-mechanical modification of treated materials, which happened upon the retrieved structural and chemical changes, was related to the modification of its acoustical properties in order to explain the observed effect. Graphic abstract: [Figure not available: see fulltext.]. © 2019, Springer Nature B.V.",
journal = "Cellulose",
title = "Impact of plasma treatment on acoustic properties of natural cellulose materials",
volume = "26",
number = "11",
pages = "6543-6554",
doi = "10.1007/s10570-019-02547-1"
}
Pavlović, S., Stanković, S. B., Žekić, A., Nenadović, M., Popović, D. M., Milosavljević, V.,& Poparić, G. B.. (2019). Impact of plasma treatment on acoustic properties of natural cellulose materials. in Cellulose, 26(11), 6543-6554.
https://doi.org/10.1007/s10570-019-02547-1
Pavlović S, Stanković SB, Žekić A, Nenadović M, Popović DM, Milosavljević V, Poparić GB. Impact of plasma treatment on acoustic properties of natural cellulose materials. in Cellulose. 2019;26(11):6543-6554.
doi:10.1007/s10570-019-02547-1 .
Pavlović, Sanja, Stanković, Snežana B., Žekić, Andrijana, Nenadović, Miloš, Popović, Dušan M., Milosavljević, Vladimir, Poparić, Goran B., "Impact of plasma treatment on acoustic properties of natural cellulose materials" in Cellulose, 26, no. 11 (2019):6543-6554,
https://doi.org/10.1007/s10570-019-02547-1 . .
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