title: Silver/chitosan/cellulose fibers foam composites: from synthesis to antibacterial properties.
abstract: Chitosan, associated with cellulose fibers, can be used for elaborating sponge-like structures (membranes, foams) for the binding of silver ions. The composite material has very promising antibacterial properties versus Pseudomonas aeruginosa (Gram(-))≫Escherichia coli (Gram(-))>Staphylococcus hominis (Gram(+))≫Staphylococcus aureus (Gram(+)). The amount of silver required for bactericidal effect is quite low (below 0.1 mg per disk, this means less than 6 mg Ag g(-1)) in antibiogram-type test but also for the treatment of water suspensions (in dynamic mode with water recycling). The presence of cellulose fibers improves the efficiency of metal binding, due to chitosan dispersion and enhancement of the availability and accessibility of amine groups. Silver nanoparticles (about 100 nm) were observed by scanning electron microscopy. The photo-reduction (exposure to sun light or UV lamp) leaded to the partial aggregation of silver nanoparticles: metal ions that were released tended to aggregate at the surface of the material.
authors.affiliation: Ecole des Mines d'Alès, Laboratoire Genie de l'Environnement Industriel, Equipe Interfaces Fonctionnalisées pour l'Environnement et la Sécurité, 6, avenue de Clavières, F-30319 Alès cedex, France. Eric.Guibal@mines-ales.fr
authors.forename: Eric
authors.initials: E
authors.lastname: Guibal
authors.forename: Simon
authors.initials: S
authors.lastname: Cambe
authors.forename: Sandrine
authors.initials: S
authors.lastname: Bayle
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Taulemesse
authors.forename: Thierry
authors.initials: T
authors.lastname: Vincent
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D002482:Cellulose / Q000737:chemistry / Q000494:pharmacology*; D048271:Chitosan / Q000737:chemistry / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004926:Escherichia coli / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D010316:Particle Size; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D012834:Silver / Q000737:chemistry / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects; D041181:Staphylococcus hominis / Q000187:drug effects; D013329:Structure-Activity Relationship; D013499:Surface Properties
chemical_list: D000900:Anti-Bacterial Agents; D012834:Silver; D002482:Cellulose; D048271:Chitosan