Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 75, Issue -, Pages 760-768Publisher
ELSEVIER
DOI: 10.1016/j.msec.2017.02.062
Keywords
Cellulose nanofibers; Aminosilanes; Aminoalkyl chain length; Functionalization; And bacterial cell reduction
Categories
Funding
- new generation packaging (NEWGENPAK) project of the seven framework program of European research [290098]
- LabEx Tec 21 (Investissements d'Avenir) [ANR-11-LABX-0030]
- Energies du Futur Institute (Investissements d'Avenir) [ANR-11-CARN-007-01, ANR-11-CARN-030-01]
- PolyNat Carnot Institute (Investissements d'Avenir) [ANR-11-CARN-007-01, ANR-11-CARN-030-01]
- Region Rhone-Alpes (ERDF: European regional development fund)
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Recent focus on the preparation of antimicrobial surfaces using cellulose nanofibers (CNF) has gained considerable attention. In this work, functionalization of CNF films in 100% aqueous solution with three different aminosilanes, including 3-aminopropyl trimethoxysilane (APMS), 2-aminoethyl 3-aminopropyl trimethoxysilane (DAMS)and 3-2-(2-aminoethylamino) ethylamino propyl-trimethoxysilane (TAMS) is reported for the fabrication of contact active antimicrobial materials. Grafted CNF films were comprehensively characterized by FFIR,TGA, contact angle, elemental analysis, solid-state Si-29 NMR, FEG-SEM and SEM-EDX. It was found that all the silanes were grafted on the surface of nanofibers without any change in the morphology or fibril structure through different grafting efficiency, depending on the aminoalkyl chain length. The effect of variable aminoalkyl length and initial grafting concentration was analyzed against gram-positive (Bacillus subtilis and Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) by qualitative and quantitative standards. The most promising results were obtained with 3-2-(2-aminoethylamino) ethylamino propyltrimethoxysilane at very low concentration which completely restrict bacterial growth after 24 h with Grampositive bacteria. This study, for the first time, established the relationship between the aminoalkyl chain length and its corresponding antibacterial activity. (C) 2017 Elsevier B.V. All rights reserved.
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