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Cross-linking of highly methoxylated pectin with copper: the specific anion influence
dc.creator | Šešlija, Sanja | |
dc.creator | Veljović, Đorđe | |
dc.creator | Kalagasidis Krušić, Melina | |
dc.creator | Stevanović, Jasmina | |
dc.creator | Veličković, Sava J. | |
dc.creator | Popović, Ivanka G. | |
dc.date.accessioned | 2019-01-30T17:50:42Z | |
dc.date.available | 2019-01-30T17:50:42Z | |
dc.date.issued | 2016 | |
dc.identifier.issn | 1144-0546 | |
dc.identifier.uri | https://cer.ihtm.bg.ac.rs/handle/123456789/1968 | |
dc.description.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. | en |
dc.publisher | Royal Soc Chemistry, Cambridge | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172062/RS// | |
dc.rights | restrictedAccess | |
dc.source | New Journal of Chemistry | |
dc.title | Cross-linking of highly methoxylated pectin with copper: the specific anion influence | en |
dc.type | article | |
dc.rights.license | ARR | |
dcterms.abstract | Шешлија, Сања; Вељовиц, Дјордје; Крусиц, Мелина Калагасидис; Поповић, Иванка Г.; Стевановић, Јасмина; Величковић, Сава Ј.; | |
dc.citation.volume | 40 | |
dc.citation.issue | 2 | |
dc.citation.spage | 1618 | |
dc.citation.epage | 1625 | |
dc.citation.other | 40(2): 1618-1625 | |
dc.citation.rank | M22 | |
dc.identifier.doi | 10.1039/c5nj03320a | |
dc.identifier.scopus | 2-s2.0-84957900109 | |
dc.identifier.wos | 000371559000089 | |
dc.type.version | publishedVersion |