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Metal cation responsive anionic microgels: behaviour towards biologically relevant divalent and trivalent ions

Chimisso, Vittoria and Conti, Simona and Kong, Phally and Fodor, Csaba and Meier, Wolfgang P.. (2020) Metal cation responsive anionic microgels: behaviour towards biologically relevant divalent and trivalent ions. Soft Matter.

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Official URL: https://edoc.unibas.ch/79758/

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Abstract

Anionic poly(vinylcaprolactam- co -itaconicacid- co -dimethylitaconate) microgels were synthesized via dispersion polymerization and their responsiveness towards cations, namely Mg 2+ , Sr 2+ , Cu 2+ and Fe 3+ , was investigated. The itaconic moieties chelate the metal ions which act as a crosslinker and decrease the electrostatic repulsion within the network, leading to a decrease in the gel size. The responsiveness towards the metal ion concentration has been studied via dynamic light scattering (DLS) and the number of ions bonded within the network has been quantified with ion chromatography. Through the protonation of the carboxylate groups in the gel network, their interaction with the cations is significantly lowered, and the metals are consequently released back in solution. The number of ions released was assessed also via ion chromatography for all four ions, whilst Mg 2+ was also used as a model ion to display the reversibility of the system. The microgels can bond and release divalent cations over multiple cycles without undergoing any loss of functionality. Moreover, these gels also selectively entrap Fe 3+ with respect to the remaining divalent cations, opening the possibility of using the proposed gels in the digestive tract as biocompatible chelating agents to fight iron overaccumulation.
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Chemie > Makromolekulare Chemie (Meier)
UniBasel Contributors:Meier, Wolfgang P.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Royal Society of Chemistry
ISSN:1744-683X
e-ISSN:1744-6848
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:23 Dec 2020 15:44
Deposited On:23 Dec 2020 15:44

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