title: Synthesis and evaluation of collagen-chitosan-hydroxyapatite nanocomposites for bone grafting.
abstract: Incorporation of hydroxyapatite (HA) into the matrix of collagen (Col) and chitosan (Chi) by in situ synthesis was introduced to prepare nanocomposites. Structural investigations of the pure Col-Chi mixture validated the influence of Chi on Col assembly, but the molecular interactions between Col and Chi was partially depressed during the intervention of in situ HA synthesis, as revealed by FTIR and DSC analyses. A series of Col-Chi-HA (CCHA) nanocomposites with varying HA content were thereby prepared by a sequential method, involving in situ synthesis in the Col-Chi system, then gelling at 25 degrees C and subsequently washing the resultant elastic gel followed by dehydration consolidation. The structural characteristics and biological properties of the dehydrated CCHA nanocomposites were further evaluated by using XRD, FTIR, TG, and SEM analyses and the osteoblast culture experiment. Formation of a well integrated microstructure of organic fibers (ca. 90 nm in size) and dense matrix including inorganic aggregates (less than 30 nm in size) was found in these nanocomposites. Rat Ros 17/2.8 Osteoblasts proliferated and attached well on the surface of both CCHA nanocomposite and Col-Chi mixture. These results indicated that in situ HA synthesis in the Col-Chi system provided a feasible route for bone grafting nanocomposites.
authors.affiliation: National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, People's Republic of China.
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Wang
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Tan
authors.forename: Bo
authors.initials: B
authors.lastname: Zhang
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Gu
authors.forename: Xudong
authors.initials: X
authors.lastname: Li
mesh_terms: D000818:Animals; D016025:Bone Transplantation; D002151:Calorimetry; D002417:Cattle; D049109:Cell Proliferation; D002478:Cells, Cultured; D048271:Chitosan / Q000138:chemical synthesis* / Q000737:chemistry; D003094:Collagen / Q000138:chemical synthesis* / Q000737:chemistry; D004055:Differential Thermal Analysis; D017886:Durapatite / Q000138:chemical synthesis* / Q000737:chemistry; D008856:Microscopy, Fluorescence; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010006:Osteoblasts / Q000166:cytology; D051381:Rats; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D003094:Collagen; D048271:Chitosan; D017886:Durapatite