Cross-linking of highly methoxylated pectin with copper: the specific anion influence
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2016
Authors
Šešlija, Sanja
Veljović, Đorđe

Kalagasidis Krušić, Melina

Stevanović, Jasmina

Veličković, Sava J.
Popović, Ivanka G.

Article (Published version)

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The aim of this work was to investigate the influence of specific anions on the cross-linking process of highly methoxylated pectin using the following copper salts CuSO4; Cu(C2H3O2)(2); CuCl2; and Cu(NO3)(2) wherein the initial salt concentrations were varied from 0.5 up to 10 g l(-1). It was found that the anions affected the sorption capacity wherein the Cu2+ sorption capacity from the sulphate solution was the highest, while it decreased in the presence of CH3COO-, Cl- and NO3- ions, respectively. This difference was mostly pronounced at the higher initial salt concentrations (co(Cu2+) > 2 g l(-1)). The obtained beads were characterized by FTIR, MS, SEM/EDS microanalysis and mechanical compression tests up to 80% of deformation. The sorption data were applied to the Langmuir and Freundlich isotherm models and various calculated parameters confirmed the sulphate anion supportive nature in metal ion binding. The value of the K-f parameter for the cross-linking process of pectin in th...e presence of acetate, chloride and nitrate was approximately the same (K-f approximate to 0.027 g g(-1)), while it was higher in the presence of sulphate anions by more than 20% (K-f = 0.0352 g g(-1)). The predicted 1/n values (1/n LT 1, 1/n > 1, 1/n = 1 for the sulphate, nitrate and acetate, and chloride anions, respectively) were the quantitative confirmation of the specific interactions involved in the cross-linking mechanism caused by different anions. The established anion influence was in accordance with the typical ion-specific influence on macromolecules in aqueous systems proposed by Hofmeister.
Source:
New Journal of Chemistry, 2016, 40, 2, 1618-1625Publisher:
- Royal Soc Chemistry, Cambridge
Funding / projects:
- Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)
DOI: 10.1039/c5nj03320a
ISSN: 1144-0546
WoS: 000371559000089
Scopus: 2-s2.0-84957900109
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IHTMTY - JOUR AU - Šešlija, Sanja AU - Veljović, Đorđe AU - Kalagasidis Krušić, Melina AU - Stevanović, Jasmina AU - Veličković, Sava J. AU - Popović, Ivanka G. PY - 2016 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1968 AB - The aim of this work was to investigate the influence of specific anions on the cross-linking process of highly methoxylated pectin using the following copper salts CuSO4; Cu(C2H3O2)(2); CuCl2; and Cu(NO3)(2) wherein the initial salt concentrations were varied from 0.5 up to 10 g l(-1). It was found that the anions affected the sorption capacity wherein the Cu2+ sorption capacity from the sulphate solution was the highest, while it decreased in the presence of CH3COO-, Cl- and NO3- ions, respectively. This difference was mostly pronounced at the higher initial salt concentrations (co(Cu2+) > 2 g l(-1)). The obtained beads were characterized by FTIR, MS, SEM/EDS microanalysis and mechanical compression tests up to 80% of deformation. The sorption data were applied to the Langmuir and Freundlich isotherm models and various calculated parameters confirmed the sulphate anion supportive nature in metal ion binding. The value of the K-f parameter for the cross-linking process of pectin in the presence of acetate, chloride and nitrate was approximately the same (K-f approximate to 0.027 g g(-1)), while it was higher in the presence of sulphate anions by more than 20% (K-f = 0.0352 g g(-1)). The predicted 1/n values (1/n LT 1, 1/n > 1, 1/n = 1 for the sulphate, nitrate and acetate, and chloride anions, respectively) were the quantitative confirmation of the specific interactions involved in the cross-linking mechanism caused by different anions. The established anion influence was in accordance with the typical ion-specific influence on macromolecules in aqueous systems proposed by Hofmeister. PB - Royal Soc Chemistry, Cambridge T2 - New Journal of Chemistry T1 - Cross-linking of highly methoxylated pectin with copper: the specific anion influence VL - 40 IS - 2 SP - 1618 EP - 1625 DO - 10.1039/c5nj03320a ER -
@article{ author = "Šešlija, Sanja and Veljović, Đorđe and Kalagasidis Krušić, Melina and Stevanović, Jasmina and Veličković, Sava J. and Popović, Ivanka G.", year = "2016", abstract = "The aim of this work was to investigate the influence of specific anions on the cross-linking process of highly methoxylated pectin using the following copper salts CuSO4; Cu(C2H3O2)(2); CuCl2; and Cu(NO3)(2) wherein the initial salt concentrations were varied from 0.5 up to 10 g l(-1). It was found that the anions affected the sorption capacity wherein the Cu2+ sorption capacity from the sulphate solution was the highest, while it decreased in the presence of CH3COO-, Cl- and NO3- ions, respectively. This difference was mostly pronounced at the higher initial salt concentrations (co(Cu2+) > 2 g l(-1)). The obtained beads were characterized by FTIR, MS, SEM/EDS microanalysis and mechanical compression tests up to 80% of deformation. The sorption data were applied to the Langmuir and Freundlich isotherm models and various calculated parameters confirmed the sulphate anion supportive nature in metal ion binding. The value of the K-f parameter for the cross-linking process of pectin in the presence of acetate, chloride and nitrate was approximately the same (K-f approximate to 0.027 g g(-1)), while it was higher in the presence of sulphate anions by more than 20% (K-f = 0.0352 g g(-1)). The predicted 1/n values (1/n LT 1, 1/n > 1, 1/n = 1 for the sulphate, nitrate and acetate, and chloride anions, respectively) were the quantitative confirmation of the specific interactions involved in the cross-linking mechanism caused by different anions. The established anion influence was in accordance with the typical ion-specific influence on macromolecules in aqueous systems proposed by Hofmeister.", publisher = "Royal Soc Chemistry, Cambridge", journal = "New Journal of Chemistry", title = "Cross-linking of highly methoxylated pectin with copper: the specific anion influence", volume = "40", number = "2", pages = "1618-1625", doi = "10.1039/c5nj03320a" }
Šešlija, S., Veljović, Đ., Kalagasidis Krušić, M., Stevanović, J., Veličković, S. J.,& Popović, I. G.. (2016). Cross-linking of highly methoxylated pectin with copper: the specific anion influence. in New Journal of Chemistry Royal Soc Chemistry, Cambridge., 40(2), 1618-1625. https://doi.org/10.1039/c5nj03320a
Šešlija S, Veljović Đ, Kalagasidis Krušić M, Stevanović J, Veličković SJ, Popović IG. Cross-linking of highly methoxylated pectin with copper: the specific anion influence. in New Journal of Chemistry. 2016;40(2):1618-1625. doi:10.1039/c5nj03320a .
Šešlija, Sanja, Veljović, Đorđe, Kalagasidis Krušić, Melina, Stevanović, Jasmina, Veličković, Sava J., Popović, Ivanka G., "Cross-linking of highly methoxylated pectin with copper: the specific anion influence" in New Journal of Chemistry, 40, no. 2 (2016):1618-1625, https://doi.org/10.1039/c5nj03320a . .