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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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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 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, 1618-1625
Publisher:
  • Royal Soc Chemistry, Cambridge
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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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1968
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