TY  - JOUR
AU  - Daković, Aleksandra
AU  - Kragović, Milan
AU  - Rottinghaus, George E.
AU  - Ledoux, David R.
AU  - Butkeraitis, Paula
AU  - Vojislavljević, Dubravka Z.
AU  - Zarić, Snežana
AU  - Stamenić, Ljubišav
PY  - 2012
UR  - https://ritnms.itnms.ac.rs/handle/123456789/215
AB  - A zinc-exchanged montmorillonite (Zn-MONT) was prepared from a natural montmorillonite (MONT) and the adsorption of aflatoxin B-1 (AFB(1)) was investigated at pH 3 and 7. Characterization of Zn-MONT was done by determination of chemical composition, the point of the zero charge (pH(pzc)), thermal (DTA/TGA/DTG) and X-ray powder diffraction (XRPD) analysis. Adsorption of AFB(1) (C-0 = 4 ppm) by Zn-MONT, at different solid/liquid ratios (10, 1 and 0.5 g L-1), at pH 3 or 7, showed that its adsorption was high (over 96%) and independent of pH, similar to MONT. No desorption of AFB(1) from MONT-AFB(1) and Zn-MONT-AFB(1) complexes occurred at pH 6.5, suggesting strong binding of AFB(1) by both adsorbents. Furthermore, AFB(1) adsorption by Zn-MONT followed a nonlinear (Langmuir) type of isotherm at pH 3 with a calculated maximum capacity of 60.17 mg g(-1). The stability of MONT-AFB(1) and Zn-MONT-AFB(1) complexes was evaluated by calculating the binding energies between AFB(1) and metal cations using quantum chemical methods. The evaluated interaction energies of AFB(1) with hydrated Zn2+, Mg2+, and Ca2+ cations showed that the strongest interaction was the interaction of the Zn2+ system, -70.2 kcal mol(-1), whereas energies for Mg-2 and Ca2+ systems were -68.8 and -62.9 kcal mol(-1), respectively. The results indicate that Zn-MONT can be suitable for potential practical application as both, an antibacterial and an aflatoxin binding agent.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Preparation and characterization of zinc-exchanged montmorillonite and its effectiveness as aflatoxin B-1 adsorbent
EP  - 220
IS  - 1
SP  - 213
VL  - 137
DO  - 10.1016/j.matchemphys.2012.09.010
UR  - conv_640
ER  - 

@article{
author = "Daković, Aleksandra and Kragović, Milan and Rottinghaus, George E. and Ledoux, David R. and Butkeraitis, Paula and Vojislavljević, Dubravka Z. and Zarić, Snežana and Stamenić, Ljubišav",
year = "2012",
abstract = "A zinc-exchanged montmorillonite (Zn-MONT) was prepared from a natural montmorillonite (MONT) and the adsorption of aflatoxin B-1 (AFB(1)) was investigated at pH 3 and 7. Characterization of Zn-MONT was done by determination of chemical composition, the point of the zero charge (pH(pzc)), thermal (DTA/TGA/DTG) and X-ray powder diffraction (XRPD) analysis. Adsorption of AFB(1) (C-0 = 4 ppm) by Zn-MONT, at different solid/liquid ratios (10, 1 and 0.5 g L-1), at pH 3 or 7, showed that its adsorption was high (over 96%) and independent of pH, similar to MONT. No desorption of AFB(1) from MONT-AFB(1) and Zn-MONT-AFB(1) complexes occurred at pH 6.5, suggesting strong binding of AFB(1) by both adsorbents. Furthermore, AFB(1) adsorption by Zn-MONT followed a nonlinear (Langmuir) type of isotherm at pH 3 with a calculated maximum capacity of 60.17 mg g(-1). The stability of MONT-AFB(1) and Zn-MONT-AFB(1) complexes was evaluated by calculating the binding energies between AFB(1) and metal cations using quantum chemical methods. The evaluated interaction energies of AFB(1) with hydrated Zn2+, Mg2+, and Ca2+ cations showed that the strongest interaction was the interaction of the Zn2+ system, -70.2 kcal mol(-1), whereas energies for Mg-2 and Ca2+ systems were -68.8 and -62.9 kcal mol(-1), respectively. The results indicate that Zn-MONT can be suitable for potential practical application as both, an antibacterial and an aflatoxin binding agent.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Preparation and characterization of zinc-exchanged montmorillonite and its effectiveness as aflatoxin B-1 adsorbent",
pages = "220-213",
number = "1",
volume = "137",
doi = "10.1016/j.matchemphys.2012.09.010",
url = "conv_640"
}

Daković, A., Kragović, M., Rottinghaus, G. E., Ledoux, D. R., Butkeraitis, P., Vojislavljević, D. Z., Zarić, S.,& Stamenić, L.. (2012). Preparation and characterization of zinc-exchanged montmorillonite and its effectiveness as aflatoxin B-1 adsorbent. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 137(1), 213-220.
https://doi.org/10.1016/j.matchemphys.2012.09.010
conv_640

Daković A, Kragović M, Rottinghaus GE, Ledoux DR, Butkeraitis P, Vojislavljević DZ, Zarić S, Stamenić L. Preparation and characterization of zinc-exchanged montmorillonite and its effectiveness as aflatoxin B-1 adsorbent. in Materials Chemistry and Physics. 2012;137(1):213-220.
doi:10.1016/j.matchemphys.2012.09.010
conv_640 .

Daković, Aleksandra, Kragović, Milan, Rottinghaus, George E., Ledoux, David R., Butkeraitis, Paula, Vojislavljević, Dubravka Z., Zarić, Snežana, Stamenić, Ljubišav, "Preparation and characterization of zinc-exchanged montmorillonite and its effectiveness as aflatoxin B-1 adsorbent" in Materials Chemistry and Physics, 137, no. 1 (2012):213-220,
https://doi.org/10.1016/j.matchemphys.2012.09.010 .,
conv_640 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Kragović, Milan
AU  - Rottinghaus, George E.
AU  - Sekulić, Živko
AU  - Milićević, Sonja
AU  - Milonjić, Slobodan K.
AU  - Zarić, Snežana
PY  - 2010
UR  - https://ritnms.itnms.ac.rs/handle/123456789/177
AB  - Natural Zeolitic tuff was modified with 2, 5 and 10 mmol M+/100 g of octadecyldimethylbenzyl ammonium (ODMBA) ions and the products were denoted as OZ-2, OZ-5 and OZ-10. The starting material and organozeolites were characterized by determination of the point of zero charge (pH(pzc)) and by thermal analysis. in vitro sorption of fumonisin B-1 (FB1) was studied for all sorbents at pH 3, 7 and 9. The pH(pzc) for the zeolitic tuff was 6.8 +/- 0.1, while the pH(pzc) for OZ-2, OZ-5 and OZ-10 pH(pzc) was 7.0 +/- 0.1. The curves pH(final) = f(pH(initial)) suggest that the surfaces of all sorbents are positively charged at pH 3 and uncharged at pH 7 and 9. High sorption of FB1 by the zeolitic tuff in acidic solution Suggests electrostatic Interactions between the anionic FB1 and the positively charged surface. At pH 7 and 9, adsorption of FB1 is prevented because anionic FB1 cannot be adsorbed at the uncharged surface. From the pH(pzc) for the organozeolites, it is possible that with lower amounts of ODMBA (OZ-2 and OZ-5), at pH 3, beside interactions between head groups of ODMBA and its alkyl chains and anionic FB1, electrostatic interactions between positive uncovered surface and anionic FB1 contribute to the sorption, while at pH 7 and 9 there is only the possibility for interactions between FB1 and ODMBA. When the zeolitic surface was completely covered with ODMBA (OZ-10), FB1 sorption was independent of the form of FB1 suggesting only interactions between ODMBA and FB1.
PB  - Elsevier, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Influence of natural zeolitic tuff and organozeolites surface charge on sorption of ionizable fumonisin B-1
EP  - 278
IS  - 1
SP  - 272
VL  - 76
DO  - 10.1016/j.colsurfb.2009.11.003
UR  - conv_577
ER  - 

@article{
author = "Daković, Aleksandra and Kragović, Milan and Rottinghaus, George E. and Sekulić, Živko and Milićević, Sonja and Milonjić, Slobodan K. and Zarić, Snežana",
year = "2010",
abstract = "Natural Zeolitic tuff was modified with 2, 5 and 10 mmol M+/100 g of octadecyldimethylbenzyl ammonium (ODMBA) ions and the products were denoted as OZ-2, OZ-5 and OZ-10. The starting material and organozeolites were characterized by determination of the point of zero charge (pH(pzc)) and by thermal analysis. in vitro sorption of fumonisin B-1 (FB1) was studied for all sorbents at pH 3, 7 and 9. The pH(pzc) for the zeolitic tuff was 6.8 +/- 0.1, while the pH(pzc) for OZ-2, OZ-5 and OZ-10 pH(pzc) was 7.0 +/- 0.1. The curves pH(final) = f(pH(initial)) suggest that the surfaces of all sorbents are positively charged at pH 3 and uncharged at pH 7 and 9. High sorption of FB1 by the zeolitic tuff in acidic solution Suggests electrostatic Interactions between the anionic FB1 and the positively charged surface. At pH 7 and 9, adsorption of FB1 is prevented because anionic FB1 cannot be adsorbed at the uncharged surface. From the pH(pzc) for the organozeolites, it is possible that with lower amounts of ODMBA (OZ-2 and OZ-5), at pH 3, beside interactions between head groups of ODMBA and its alkyl chains and anionic FB1, electrostatic interactions between positive uncovered surface and anionic FB1 contribute to the sorption, while at pH 7 and 9 there is only the possibility for interactions between FB1 and ODMBA. When the zeolitic surface was completely covered with ODMBA (OZ-10), FB1 sorption was independent of the form of FB1 suggesting only interactions between ODMBA and FB1.",
publisher = "Elsevier, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Influence of natural zeolitic tuff and organozeolites surface charge on sorption of ionizable fumonisin B-1",
pages = "278-272",
number = "1",
volume = "76",
doi = "10.1016/j.colsurfb.2009.11.003",
url = "conv_577"
}

Daković, A., Kragović, M., Rottinghaus, G. E., Sekulić, Ž., Milićević, S., Milonjić, S. K.,& Zarić, S.. (2010). Influence of natural zeolitic tuff and organozeolites surface charge on sorption of ionizable fumonisin B-1. in Colloids and Surfaces B-Biointerfaces
Elsevier, Amsterdam., 76(1), 272-278.
https://doi.org/10.1016/j.colsurfb.2009.11.003
conv_577

Daković A, Kragović M, Rottinghaus GE, Sekulić Ž, Milićević S, Milonjić SK, Zarić S. Influence of natural zeolitic tuff and organozeolites surface charge on sorption of ionizable fumonisin B-1. in Colloids and Surfaces B-Biointerfaces. 2010;76(1):272-278.
doi:10.1016/j.colsurfb.2009.11.003
conv_577 .

Daković, Aleksandra, Kragović, Milan, Rottinghaus, George E., Sekulić, Živko, Milićević, Sonja, Milonjić, Slobodan K., Zarić, Snežana, "Influence of natural zeolitic tuff and organozeolites surface charge on sorption of ionizable fumonisin B-1" in Colloids and Surfaces B-Biointerfaces, 76, no. 1 (2010):272-278,
https://doi.org/10.1016/j.colsurfb.2009.11.003 .,
conv_577 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Tomašević-Čanović, Magdalena
AU  - Dondur, Vera
AU  - Rottinghaus, George E.
AU  - Medaković, V
AU  - Zarić, Snežana
PY  - 2005
UR  - https://ritnms.itnms.ac.rs/handle/123456789/81
AB  - Adsorption of zearalenone (ZEN), ochratoxin A (OCHRA) and aflatoxin B1 (AFB1) on natural zeolite, clinoptilolite, modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) ions was investigated. Results showed that adsorption of hydrophobic ionizable ZEN on unmodified zeolite tuff was very low and that adsorption on organozeolites increased with increasing hydrophobicity of the zeolitic surface. The adsorption was independent of the form of ZEN in solution and the solution pH, indicating that hydrophobic interactions with ODMBA are responsible for ZEN adsorption. Adsorption of low polar ionizable OCHRA on organozeolites also increased with increasing hydrophobicity of the zeolitic surface, however, OCHRA showed moderate adsorption on unmodified zeolitic tuff at pH 3. OCHRA adsorption on unmodified zeolite as well as on lower surface coverage of organozeolite was dependent on the form of OCHRA in solution; there was a decrease of adsorption at high pH, where OCHRA is in the anionic form. It indicated that at acidic pH, low surface coverage allows some combination of hydrophobic interaction with ODMBA and interactions with the surface of the zeolite. At higher surface coverage, the OCHRA adsorption was higher and practically independent of pH, indicating that the hydrophobic interactions of OCHRA with ODMBA are responsible for its adsorption. Nonionizable low polar AFB1 had a high affinity for the unmodified zeolitic tuff and the adsorption of AFB1 was greatly reduced for organozeolites, indicating that AFB1 does not have high tendency for hydrophobic interactions with ODMBA. pH dependence of AFB1 adsorption, while AFB1 has the same form at all pHs, demonstrated that the surface modification of the zeolite depends on pH and that these modifications have influence on its adsorption. The calculated dipole moments of neutral mycotoxin molecules: AFB1-9.5D, OCHRA-6.9D and ZEN-2.2D are in qualitative agreement with adsorption experimental data.
PB  - Elsevier, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Adsorption of mycotoxins by organozeolites
EP  - 25
IS  - 1
SP  - 20
VL  - 46
DO  - 10.1016/j.colsurfb.2005.08.013
UR  - conv_506
ER  - 

@article{
author = "Daković, Aleksandra and Tomašević-Čanović, Magdalena and Dondur, Vera and Rottinghaus, George E. and Medaković, V and Zarić, Snežana",
year = "2005",
abstract = "Adsorption of zearalenone (ZEN), ochratoxin A (OCHRA) and aflatoxin B1 (AFB1) on natural zeolite, clinoptilolite, modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) ions was investigated. Results showed that adsorption of hydrophobic ionizable ZEN on unmodified zeolite tuff was very low and that adsorption on organozeolites increased with increasing hydrophobicity of the zeolitic surface. The adsorption was independent of the form of ZEN in solution and the solution pH, indicating that hydrophobic interactions with ODMBA are responsible for ZEN adsorption. Adsorption of low polar ionizable OCHRA on organozeolites also increased with increasing hydrophobicity of the zeolitic surface, however, OCHRA showed moderate adsorption on unmodified zeolitic tuff at pH 3. OCHRA adsorption on unmodified zeolite as well as on lower surface coverage of organozeolite was dependent on the form of OCHRA in solution; there was a decrease of adsorption at high pH, where OCHRA is in the anionic form. It indicated that at acidic pH, low surface coverage allows some combination of hydrophobic interaction with ODMBA and interactions with the surface of the zeolite. At higher surface coverage, the OCHRA adsorption was higher and practically independent of pH, indicating that the hydrophobic interactions of OCHRA with ODMBA are responsible for its adsorption. Nonionizable low polar AFB1 had a high affinity for the unmodified zeolitic tuff and the adsorption of AFB1 was greatly reduced for organozeolites, indicating that AFB1 does not have high tendency for hydrophobic interactions with ODMBA. pH dependence of AFB1 adsorption, while AFB1 has the same form at all pHs, demonstrated that the surface modification of the zeolite depends on pH and that these modifications have influence on its adsorption. The calculated dipole moments of neutral mycotoxin molecules: AFB1-9.5D, OCHRA-6.9D and ZEN-2.2D are in qualitative agreement with adsorption experimental data.",
publisher = "Elsevier, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Adsorption of mycotoxins by organozeolites",
pages = "25-20",
number = "1",
volume = "46",
doi = "10.1016/j.colsurfb.2005.08.013",
url = "conv_506"
}

Daković, A., Tomašević-Čanović, M., Dondur, V., Rottinghaus, G. E., Medaković, V.,& Zarić, S.. (2005). Adsorption of mycotoxins by organozeolites. in Colloids and Surfaces B-Biointerfaces
Elsevier, Amsterdam., 46(1), 20-25.
https://doi.org/10.1016/j.colsurfb.2005.08.013
conv_506

Daković A, Tomašević-Čanović M, Dondur V, Rottinghaus GE, Medaković V, Zarić S. Adsorption of mycotoxins by organozeolites. in Colloids and Surfaces B-Biointerfaces. 2005;46(1):20-25.
doi:10.1016/j.colsurfb.2005.08.013
conv_506 .

Daković, Aleksandra, Tomašević-Čanović, Magdalena, Dondur, Vera, Rottinghaus, George E., Medaković, V, Zarić, Snežana, "Adsorption of mycotoxins by organozeolites" in Colloids and Surfaces B-Biointerfaces, 46, no. 1 (2005):20-25,
https://doi.org/10.1016/j.colsurfb.2005.08.013 .,
conv_506 .