Antimicrobial and antioxidant supramolecular ionic liquid gels from biopolymer mixtures

In this work, we describe the preparation and characterization of supramolecular ionic liquid gels based on binary mixtures of biopolymers, comprising chitosan, chitin, cellulose and lignin. The gels were obtained in ionic liquids differing in the cation or the anion, with no need for a cross-linkin...

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Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2023-05, Vol.25 (9), p.3692-374
Main Authors: Marullo, Salvatore, Gallo, Giuseppe, Infurna, Giulia, Dintcheva, Nadka Tz, D'Anna, Francesca
Format: Article
Language:English
Subjects:
Anions
Antiinfectives and antibacterials
Antioxidants
Bacteria
Bactericidal activity
Binary mixtures
Biopolymers
Cell viability
Cellulose
Chitin
Chitosan
Crosslinking
E coli
Free radicals
Gels
Green chemistry
Ionic liquids
Ions
Porosity
Rheological properties
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Summary:In this work, we describe the preparation and characterization of supramolecular ionic liquid gels based on binary mixtures of biopolymers, comprising chitosan, chitin, cellulose and lignin. The gels were obtained in ionic liquids differing in the cation or the anion, with no need for a cross-linking agent or acid treatment. The materials obtained were characterized for the minimum gelation concentration, porosity, swelling and rheological properties, finding a prominent influence of the nature of the ionic liquid anion. Then, we investigated the ability of the gels to scavenge free radicals, finding that the gels exhibit a higher antioxidant ability than their individual components. Moreover, our gels showed a bactericidal activity toward Gram-positive and Gram-negative bacterial strains like Streptomyces coelicolor and Escherichia coli , respectively. The kinetics of bacterial cell viability showed that the gel based on a chitosan : chitin mixture in the IL [bmim][Cl] was the fastest acting against E. coli , with a practically total killing of bacterial cells within 30 min. Once again, a major influence of the ionic liquid anion was detected. Finally, we found an inverse relationship between the antioxidant and antimicrobial activities of our gels. In this work, we describe the preparation and characterization of supramolecular ionic liquid gels based on binary mixtures of biopolymers, comprising chitosan, chitin, cellulose and lignin.
ISSN:1463-9262
1463-9270
DOI:10.1039/d2gc04358k