Removal of Cu(II) from aqueous solutions imparted by a pectin-based film: Cytocompatibility, antimicrobial, kinetic, and equilibrium studies

To obtain pectin-based films is challenging due to the aqueous instability of polyelectrolyte mixtures. We overcome this issue by blending chitosan to pectin of high O-methoxylation degree (56%), followed by solvent evaporation. A durable film containing 74 wt% pectin content was produced and used a...

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Bibliographic Details
Published in:International journal of biological macromolecules 2020-06, Vol.152, p.77-89
Main Authors: Martins, Jéssica G., Facchi, Débora P., Berton, Sharise B.R., Nunes, Cátia S., Matsushita, Makoto, Bonafé, Elton G., Popat, Ketul C., Almeida, Vitor C., Kipper, Matt J., Martins, Alessandro F.
Format: Article
Language:English
Subjects:
Adsorption
Anti-Infective Agents - chemistry
Anti-Infective Agents - pharmacology
Chitosan
Chitosan - chemistry
Copper - chemistry
Copper - isolation & purification
Escherichia coli - drug effects
Kinetics
Materials Testing
Methylation
Pectins - chemistry
Pectins - pharmacology
Polyelectrolyte complex
Solutions
Water - chemistry
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Summary:To obtain pectin-based films is challenging due to the aqueous instability of polyelectrolyte mixtures. We overcome this issue by blending chitosan to pectin of high O-methoxylation degree (56%), followed by solvent evaporation. A durable film containing 74 wt% pectin content was produced and used as an adsorbent material toward Cu(II) ions. Kinetic and adsorption equilibrium studies showed that the pseudo-second-order and Sips isotherm models adjusted well to the experimental data, respectively. Langmuir isotherm indicated a maximum adsorption capacity (qm) for Cu(II) removal of 29.20 mg g−1. Differential scanning calorimetry, contact angle measurements, and X-ray photoelectron spectroscopy confirm the adsorption. The chemisorption plays an essential role in the process; thereby, the film reusability is low. After adsorption, the cytocompatible film/Cu(II) pair prevents the proliferation of Escherichia coli. •A physically crosslinked film contains high pectin content (74 wt%).•The film presents sorption capacity for Cu(II) ions of 29.20 mg g−1.•The chemisorption plays an essential role in the Cu(II) adsorption.•After adsorption, the film/Cu(II) has cytocompatibility for mammalian cells.•The film/Cu(II) prevents the spreading of E. coli on its surface.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2020.02.220