Binding of metal ions to polysaccharides. II. The binding of metal ions to chondroitin sulphate in alkaline media

Balt, S.; Bolster, M. W. G. De; Visser-Luirink, Gesina

doi:10.1016/s0020-1693(00)86500-7

Cited by 17 publications

(8 citation statements)

References 27 publications

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“…This coupler attaches to saccharides through the hydroxyl groups, leaving other groups intact, such as carboxylate and sulfate. These groups confer a negatively charged surface to the composites and a cation complexing ability . The composites were microporous, presenting surface areas ≤12 m 2 g −1 and relatively low sorption capacities for heavy metal cations (2–24 mg g −1 ).…”

Section: Introductionmentioning

confidence: 99%

“…These groups confer a negatively charged surface to the composites and a cation complexing ability. [1][2][3][5][6][7][8] The composites were microporous, presenting surface areas ≤12 m 2 g −1 and relatively low sorption capacities for heavy metal cations (2-24 mg g −1 ). Later on, by bioimprinting, it was possible to obtain composites with enhanced selectivity towards Pb(II).…”

Section: Introductionmentioning

confidence: 99%

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Cation‐bioimprinted mesoporous polysaccharide/sol–gel composites prepared in media containing choline chloride‐based deep eutectic solvents

Ferreira

Azenha

Pereira

et al. 2019

J of Applied Polymer Sci

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A study on the Pb(II) imprinting performed within mesoporous sulphated biopolymer/siloxane composites, prepared in media containing deep eutectic solvent (DES), is described. In general, the process of imprinting resulted in greatly increased surface areas relatively to the corresponding nonimprinted composites [up to fivefold (from 76 m2 g−1 to 360 m2 g−1) for fucoidan (Fuc) and up to twofold (from 208 m2 g−1 to 351 m2 g−1) for chondroitin sulfate (CS) composites], the diminishing of mean pore size (from 3.3–4.6 nm to 2.9–3.4), and higher biopolymer contents (from mass fractions of 0.42–0.52 to 0.46–0.68). The sorption features depended a great deal on the biopolymer/DES combination. The best CS composite, allowed for 12% capacity and 20% binding strength, as well as Pb(II)/Cd(II) selectivity enhancements. The largest of the capacities was obtained with the imprinted Fuc/DES‐E composite, 86 mg g−1, a 10% increase. Concerning the selectivity [Pb(II) versus Cd(II)], there was a significant increase for the CS composites (from 1.0–1.1 (αqmax)/1.1–1.2 (αK) to 1.3–1.4 (αqmax)/1.3–1.6 (αK)]. In particular, the DES‐E CIC presented high selectivity factors (αqmax 3.0/αK 3.2) in line with those of the microporous version (αqmax 2.0/αK 3.3) but showing a significant increase in terms of the αqmax selectivity. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48842.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cation‐bioimprinted mesoporous polysaccharide/sol–gel composites prepared in media containing choline chloride‐based deep eutectic solvents

Ferreira

Azenha

Pereira

et al. 2019

J of Applied Polymer Sci

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“…The process relies on a sol‐gel reaction that delivers a rigid microporous biopolymer‐silica composite, which maintains the original ability of CS to complex metal cations via the carboxylate and sulfate groups . The composite allows thus the exploitation of the negatively charged CS for metal cation‐related applications requiring nonsoluble forms of the biopolymer, such as cation recovery from solution or sensor preparation.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the addition of metal cations to aqueous solutions of CS induces major alterations in the rheological properties, such as a raise in viscosity . These effects are explained by the cross complexation, which brings together 2 or more polymer chains to a single complexation point (the cation), resulting, in certain conditions, in the precipitation of a gel.…”

Section: Introductionmentioning

confidence: 99%

“…These effects are explained by the cross complexation, which brings together 2 or more polymer chains to a single complexation point (the cation), resulting, in certain conditions, in the precipitation of a gel. The driving force of such cross complexation comes mainly from the carboxylate and sulfate ligand groups of 2 different CS chains sharing a single central cation coordination center . This phenomenon may be also seen from the perspective of the metal cation acting as a perturbation that greatly changes the spatial configurations of the CS chains.…”

Section: Introductionmentioning

confidence: 99%

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Cationic imprinting of Pb(II) within composite networks based on bovine or fish chondroitin sulfate

Ferreira

Azenha

Mêna

et al. 2017

J of Molecular Recognition

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Imprinting chondroitin sulfate (CS)/silica composites with Pb(II) and Cu(II) cations was explored with CS of bovine and different fish species origin. The process was based on the assumption that particular arrangements of the linear CS chains in aqueous solution, induced so as to accommodate cross complexation with the cations, would be embodied into a tridimensional matrix created through an organoalkoxysilane sol-gel scheme. The presence of Cu(II) in the synthesis of the composites did not result in the production of significantly stronger Cu(II)-oriented binding arrangements, and therefore, the imprinting was not successful. Inversely, for Pb(II), the materials obtained exhibited a "memory" effect for the Pb(II) ions, expressed in the observation of stronger (13%-44%) binding as compared to the nonimprinted counterparts, and increased selectivity (1.5-2 folds) against Cd(II). The imprinting features observed were dependent on the CS source. However, it was not possible to identify, among a set of their properties (carboxylate and sulfate abundance, percent of disulfated units, 4S/6S ratio, and molecular weight), any that correlated directly with the observed imprinting features. The augmented selectivity provided by the cation-imprinting process may be advantageous in areas such as analytical separation, remediation, purification, sensing, and others, particularly in those cases where a certain cation is of special interest within a mixture of them.

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ChemInform Abstract: BINDING OF METAL IONS TO POLYSACCHARIDES. II. THE BINDING OF METAL IONS TO CHONDROITIN SULFATE IN ALKALINE MEDIA

Balt¹,

Bolster²,

Visser-Luirink³

1983

Chemischer Informationsdienst

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Binding of metal ions to polysaccharides. II. The binding of metal ions to chondroitin sulphate in alkaline media

Cited by 17 publications

References 27 publications

Cation‐bioimprinted mesoporous polysaccharide/sol–gel composites prepared in media containing choline chloride‐based deep eutectic solvents

Cation‐bioimprinted mesoporous polysaccharide/sol–gel composites prepared in media containing choline chloride‐based deep eutectic solvents

Cationic imprinting of Pb(II) within composite networks based on bovine or fish chondroitin sulfate

ChemInform Abstract: BINDING OF METAL IONS TO POLYSACCHARIDES. II. THE BINDING OF METAL IONS TO CHONDROITIN SULFATE IN ALKALINE MEDIA

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