title: Degradability of polysaccharides multilayer films in the oral environment: an in vitro and in vivo study.
abstract: Biomedical devices and modified biomaterial surfaces constitute an expanding research domain in the dental field. However, such oral applications have to face a very particular environment containing specific physiological conditions and specific enzymes. To evaluate their suitability in the development of novel oral applications, the degradability of polyelectrolyte multilayer films made of the natural polysaccharides chitosan and hyaluronan (CHI/HA) was investigated in vitro and in vivo in a rat mouth model. The films were either native or cross-linked using a water-soluble carbodiimide (EDC) in combination with N-hydroxysulfosuccinimide. The in vitro degradation of the films by different enzymes present in the oral environment, such as lysozyme and amylase, was followed by quartz crystal microbalance measurements and confocal laser scanning microscopy observations after being film labeled with CHI(FITC). Whereas native films were subjected to degradation by all the enzymes, cross-linked films were more resistant to enzymatic degradation. Films were also put in contact with whole saliva, which induced a slow degradation of the native films over an 18 h period. The in vivo degradation of the films deposited on polymer disks and sutured in the rat mouth was followed over a 3 day period. Whereas film degradation is fast for native films, it is much slower for the cross-linked ones. More than 60% of these films remained on the disks after 3 days in the mouth. Taken together, these results suggest that the multilayer films made of natural polysaccharides are of high potential interest for oral applications, especially as drug release systems, offering various degradation rates and consequent release characteristics.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Unité 595, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Etienne
authors.forename: Aurore
authors.initials: A
authors.lastname: Schneider
authors.forename: Corinne
authors.initials: C
authors.lastname: Taddei
authors.forename: Ludovic
authors.initials: L
authors.lastname: Richert
authors.forename: Pierre
authors.initials: P
authors.lastname: Schaaf
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Voegel
authors.forename: Christophe
authors.initials: C
authors.lastname: Egles
authors.forename: Catherine
authors.initials: C
authors.lastname: Picart
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D048271:Chitosan / Q000378:metabolism; D003764:Dental Materials / Q000737:chemistry* / Q000378:metabolism; D004798:Enzymes / Q000378:metabolism; D006820:Hyaluronic Acid / Q000378:metabolism; D009055:Mouth / Q000378:metabolism*; D011134:Polysaccharides / Q000378:metabolism*; D051381:Rats; D012463:Saliva / Q000378:metabolism
chemical_list: D003764:Dental Materials; D004798:Enzymes; D011134:Polysaccharides; D006820:Hyaluronic Acid; D048271:Chitosan