title: Physical, chemical and in vitro biological profile of chitosan hybrid membrane as a function of organosiloxane concentration.
abstract: We attempted to prepare chitosan-silicate hybrid for use in a medical application and evaluated the physico-chemical properties and osteocompatibility of the hybrids as a function of gamma-glycidoxypropyltrimethoxysilane (GPTMS) concentration. Chitosan-silicate hybrids were synthesized using GPTMS as the reagent for cross-linking of the chitosan chains. Fourier transform infrared spectroscopy, (29)Si CP-MAS NMR spectroscopy and the ninhydrin assay were used to analyze the structures of the hybrids, and stress-strain curves were recorded to estimate their Young's modulus. The swelling ability, contact angle and cytocompatibility of the hybrids were investigated as a function of the GPTMS concentration. A certain fraction of GPTMS in each hybrid was linked at the epoxy group to the amino group of chitosan, which was associated with the change in the methoxysilane group of GPTMS due to hybridization. The cross-linking density was around 80% regardless of the volume of GPTMS. As the content of GPTMS increased, the water uptake decreased and the hydrophilicity of the hybrids increased except when the content exceeded amolar ratio of 1.5, when it caused a decrease. The values of the mechanical parameters assessed indicated that significant stiffening of the hybrids was obtained by the addition of GPTMS. The adhesion and proliferation of the MG63 osteoblast cells cultured on the chitosan-GPTMS hybrid surface were improved compared to those on the chitosan membrane, regardless of the GPTMS concentration. Moreover, human bone marrow osteoblast cells proliferated on the chitosan-GPTMS hybrid surface and formed a fibrillar extracellular matrix with numerous calcium phosphate globular structures, both in the presence and in the absence of dexamethasone. Therefore, the chitosan-GPTMS hybrids are promising candidates for basic materials that can promote bone regeneration because of their controllable composition (chitosan/GPTMS ratio).
authors: Biomaterial Laboratory, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama-shi 700-8530, Japan.
authors: Yuki
authors: Y
authors: Shirosaki
authors: Kanji
authors: K
authors: Tsuru
authors: Satoshi
authors: S
authors: Hayakawa
authors: Akiyoshi
authors: A
authors: Osaka
authors: Maria Ascensão
authors: MA
authors: Lopes
authors: José Domingos
authors: JD
authors: Santos
authors: Maria Adelina
authors: MA
authors: Costa
authors: Maria Helena
authors: MH
authors: Fernandes
mesh_terms: D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000378:metabolism; D012821:Silanes / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D023822:Tissue Engineering / Q000379:methods
chemical_list: D003432:Cross-Linking Reagents; D012821:Silanes; D012833:Siloxanes; C039462:gamma-glycidoxypropyltrimethoxysilane; D048271:Chitosan