title: Contact-active antibacterial aerogels from cellulose nanofibrils.
abstract: The use of cellulose aerogels as antibacterial materials has been investigated by applying a contact-active layer-by-layer modification to the aerogel surface. Studying the adsorption of multilayers of polyvinylamine (PVAm) and polyacrylic acid to aerogels comprising crosslinked cellulose nanofibrils and monitoring the subsequent bacterial adhesion revealed that up to 26mgPVAmgaerogel(-1) was adsorbed without noticeably affecting the aerogel structure. The antibacterial effect was tested by measuring the reduction of viable bacteria in solution when the aerogels were present. The results show that >99.9% of the bacteria adhered to the surface of the aerogels. Microscopy further showed adherence of bacteria to the surfaces of the modified aerogels. These results indicate that it is possible to create materials with three-dimensional cellulose structures that adsorb bacteria with very high efficiency utilizing the high specific surface area of the aerogels in combination with their open structure.
authors.affiliation: Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden. Electronic address: hens@kth.se.
authors.forename: Jonatan
authors.initials: J
authors.lastname: Henschen
authors.affiliation: Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden.
authors.forename: Josefin
authors.initials: J
authors.lastname: Illergård
authors.affiliation: Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden.
authors.forename: Per A
authors.initials: PA
authors.lastname: Larsson
authors.affiliation: Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden.
authors.forename: Monica
authors.initials: M
authors.lastname: Ek
authors.affiliation: Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden. Electronic address: wagberg@kth.se.
authors.forename: Lars
authors.initials: L
authors.lastname: Wågberg
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000737:chemistry* / Q000494:pharmacology; D001422:Bacterial Adhesion / Q000187:drug effects*; D002482:Cellulose / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D057139:Nanofibers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000900:Anti-Bacterial Agents; D005782:Gels; D002482:Cellulose
keywords: Aerogel; Antibacterial; Cellulose nanofibrils; Contact active; Polymer adsorption