title: Chitosan/nanohydroxyapatite composite membranes via dynamic filtration for guided bone regeneration.
abstract: Chitosan/hydroxyapatite (HA) composite membranes were prepared by the coprecipitation method and a subsequent dynamic filtration and freeze-drying process. The influences of the HA content of the membranes on their phase and morphology, mechanical properties, and bioactivity were investigated. FTIR analysis revealed that chitosan and HA had good miscibility over a wide range of compositions. Needle-like HA nanocrystals with low crystallinity were uniformly embedded in the chitosan matrix. As the HA content was increased, the tensile strength of the membranes exhibited a steady decrease, while the elastic modulus increased by a factor of 2 when 20% HA was added. The results of the in vitro cell culture showed that the highest alkaline phosphatase level was achieved when 30% HA was contained in the composites.
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea.
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Teng
authors.forename: Eun-Jung
authors.initials: EJ
authors.lastname: Lee
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Yoon
authors.forename: Du-Sik
authors.initials: DS
authors.lastname: Shin
authors.forename: Hyoun-Ee
authors.initials: HE
authors.lastname: Kim
authors.forename: Joong-Soo
authors.initials: JS
authors.lastname: Oh
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D001861:Bone Regeneration; D002460:Cell Line; D048271:Chitosan / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D005374:Filtration; D051379:Mice; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D013055:Spectrophotometry, Infrared; D013314:Stress, Mechanical; D013718:Tensile Strength; D014961:X-Ray Diffraction
chemical_list: D048271:Chitosan; D017886:Durapatite; D000469:Alkaline Phosphatase