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

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Ferreira, VRA (Author) Other; Manuel Azenha (Author) FCUP; Teresa Mena, MT (Author) Other; C. Moura (Author) FCUP; Carlos M Pereira (Author) FCUP; Perez Martin, RI (Author) Other; Vazquez, JA (Author) Other; Silva, F (Author) FCUP

Journal

Title: Journal of Molecular Recognition

Vol. 31

Final page: e2614

ISSN: 0952-3499

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-00N-2MD

DOI: 10.1002/jmr.2614

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9