牛骨胶原基质的制备和性能研究

研究了从牛密质骨制备用作生物医学异种移植物的加工方法。将从屠宰场获得的牛腿骨骨干中部密质骨切割成一定的形状,然后经过脱脂和脱蛋白,制得可加工成任意形状的材料。用脱脂剂、非胶原蛋白除剂和蛋白酶消化剂等进行处理,脱除非胶原蛋白并切除胶原端肽,骨块经干燥,γ射线消毒后,密封包装。并进行各种理化性能测试,包括红外光谱、X射线衍射光谱、差热扫描分析(DSC)、单轴拉伸力学性能测试以及扫描电镜观察。结果表明,经过一系列处理后,获得的骨胶原基质(BBCM)是一种白色、具有一定孔隙结构的材料,保留了天然骨的无机成分和大部分胶原蛋白,具有良好的力学性能和较低的免疫原性,是一种潜在的骨移植材料和组织工程基质材料。

Preparation and Characterization of Bovine Bone Collagen Matrix

A process of preparing bovine cortical bone in order to form materials suitable for biomedical xenograft implants was described. Fresh bone samples cut from the middiaphyseal region of bovine femora were obtained from a local slaughterhouse.The bovine bone collagen matrix (BBCM) of various shapes fabricated from bovine bone by defatting and deproteination procedure may be implanted surgically for various purposes. The bone cubes were first defatted in a mixture of defatting agent; subsequently,the samples were extracted to release noncollagenous proteins, followed by digestion using a proteolytic enzyme to remove the telopeptide portions of collagen and residual noncollagenous proteins. Finally,the samples were dried in vacuum, packed and sterilized by gamma irradiation.The bone specimens were characterized by a suite of analytical techniques involving FTIR spectroscopy, X-ray diffraction spectroscopy, differential scanning calorimetry (DSC), uniaxial tension mechanical tests and scanning electron microscopy (SEM). The result showed that BBCM occurred as a white structure with suitable porosity. It contains reasonable proprotion of mineral and organic components in the original osseous architecture of the bovine bone,which is beneficial to keeping the mechanic property and weaker immunogenicity; therefore, it can serve as a potential bone implantable material and extracellular matrix material in bone tissue engineering.