title: Preparation and in vitro investigation of chitosan/nano-hydroxyapatite composite used as bone substitute materials.
abstract: Chitosan/nano-hydroxyapatite composites with different weight ratios were prepared through a co-precipitation method using Ca(OH)(2), H(3)PO(4) and chitosan as starting materials. The properties of these composites were characterized by means of TEM, IR, XRD, burn-out test and universal matertial test machine. Additionally, in vitro tests were also conducted to investigate the biodegradability and bioactivity of the composite. The results showed that the HA synthesized here was poorly crystalline carbonated nanometer crystals and dispersed uniformly in chitosan phase and there is no phase-separation between the two phases. Because of the interactions between chitosan and n-HA, the mechanical properties of these composites were improved, and the maximum value of the compressive strength was measured about 120 MPa corresponding to the chitosan/n-HA composite with a weight ratio of 30/70. The specimens made of 30/70 chitosan/n-HA composite exhibit high biodegradability and bioactivity when being immersed in SBF solutions. The composite is appropriate to being used as scaffold materials for bone tissue engineering. (c) Springer Science + Business Media, Inc.
authors.affiliation: Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, People's Republic of China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Yubao
authors.forename: Yang
authors.initials: Y
authors.lastname: Aiping
authors.forename: Peng
authors.initials: P
authors.lastname: Xuelin
authors.forename: Wang
authors.initials: W
authors.lastname: Xuejiang
authors.forename: Zhang
authors.initials: Z
authors.lastname: Xiang
mesh_terms: D001672:Biocompatible Materials; D001826:Body Fluids / Q000502:physiology; D018786:Bone Substitutes / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D048271:Chitosan / Q000138:chemical synthesis* / Q000737:chemistry; D017886:Durapatite / Q000138:chemical synthesis* / Q000737:chemistry; D006358:Hot Temperature; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D013055:Spectrophotometry, Infrared; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D048271:Chitosan; D017886:Durapatite; D002118:Calcium
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