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Enzymatic functionalization of cork surface with antimicrobial hybrid biopolymer/silver nanoparticles
Francesko, Antonio; Blandon, Lucas; Vázquez, Mario; Petkova Petkova, Petya Stoyanova; Morató Farreras, Jordi; Pfeifer, Annett; Heinze, Thomas; Mendoza Gómez, Ernesto; Tzanov, Tzanko
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria; Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GBMI - Grup de Biotecnologia Molecular i Industrial; Universitat Politècnica de Catalunya. SUMMLab - Laboratori de Mesura i Modelització de la Sostenibilitat
Laccase-assisted assembling of hybrid biopolymer-silver nanoparticles and cork matrices into an antimicrobial material with potential for water remediation is herein described. Amino-functional biopolymers were first used as doping agents to stabilize concentrated colloidal dispersions of silver nanoparticles (AgNP), additionally providing the particles with functionalities for covalent immobilization onto cork to impart a durable antibacterial effect. The solvent-free AgNP synthesis by chemical reduction was carried out in the presence of chitosan (CS) or 6-deoxy-6-(omega-aminoethyl) aminocellulose (AC), leading to simultaneous AgNP biofunctionalization. This approach resulted in concentrated hybrid NP dispersion stable to aggregation and with hydrodynamic radius of particles of about 250 nm. Moreover, laccase enabled coupling between the phenolic groups in cork and amino moieties in the biopolymer-doped AgNP for permanent modification of the material. The antibacterial efficiency of the functionalized cork matrices, aimed as adsorbents for wastewater treatment, was evaluated against Escherichia coli and Staphylococcus aureus during 5 days in conditions mimicking those in constructed wetlands. Both intrinsically antimicrobial CS and AC contributed to the bactericidal effect of the enzymatically grafted on cork AgNP. In contrast, unmodified AgNP were easily washed off from the material, confirming that the biopolymers potentiated a durable antibacterial functionalization of the cork matrices.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química
amino-functional biopolymers
silver nanoparticles
enzymatic grafting
antimicrobial activity
flow constructed wetlands
solid-state c-13-nmr
quercus-suber l.
silver nanoparticles

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