Journal
CELLULOSE
Volume 26, Issue 16, Pages 8655-8668Publisher
SPRINGER
DOI: 10.1007/s10570-019-02678-5
Keywords
Bacterial cellulose oxidation; Laccase; Bacterial cellulose paper; Nanocomposite; Silver nanoparticle; Antimicrobial activity
Funding
- Spanish Ministry of Economy, Industry and Competitiveness (Fondo Europeo de Desarrollo Regional FEDER) [MICROBIOCEL: CTQ2017-84966-C2-1-R, CTQ2017-84966-C2-2-R, FILMBIOCEL CTQ2016-77936-R]
- Pla de Recerca de Catalunya [2017SGR-30]
- Generalitat de Catalunya, Xarxa de Referencia en Biotecnologia (XRB)
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Bacterial cellulose (BC) was functionalized applying the Laccase/TEMPO oxidative treatment, leading to a five-fold increase of the concentration of carboxyl groups. Paper produced with this cellulose showed improved mechanical properties while maintaining barrier function against water and greases as compared to paper produced with non-oxidized BC. Also, the negative charge provided by the carboxyl groups on functionalized BC was used to generate silver nanoparticles (AgNPs), obtaining a BC paper and Ag composite. The presence of AgNPs in the composites was validated by SEM, EDS and ICP analysis, showing spherical, uniformly sized particles stabilized in the BC nanofibers matrix. Additionally, antimicrobial property of composites containing AgNPs was tested. The results showed the strong antimicrobial activity of the composites against Gram-positive and Gram-negative bacteria and fungi. The generation of Ag nanoparticles in a matrix that combine the physical characteristics of the BC nanofibers with the stiffness and the mechanical properties of paper produced composites that may have applicability in technological and biomedical uses. Graphic abstract
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