摘要
目的考察胶原溶胀液浓度、预冻温度等制备工艺条件对胶原多孔支架结构和性质的影响。方法采用冷冻干燥法制备胶原多孔支架,分别以不同浓度(0.2%～0.8%)的胶原溶胀液,经-50℃预冻制备;同时选择0.6%胶原溶胀液,分别经不同预冻温度(-20～-80℃)预冻制备。以甲醛为交联剂对胶原多孔支架进行化学交联。考察不同制备条件下制备的胶原多孔支架孔径结构、力学强度和降解率等性质,同时将兔关节软骨细胞种植在胶原多孔支架上,应用MTT法和扫描电镜观察比较其细胞相容性。结果随着胶原溶胀液浓度增加,多孔支架平均有效孔径逐渐减小,分布更加不均,孔径范围为50～200μm之间,支架的密度和抗拉强度逐渐增加,降解率逐渐减小;随着预冻温度的降低,胶原多孔支架孔径逐渐减小,分布更均一,降解率逐渐减小。细胞培养结果显示,胶原溶胀液浓度的减低和预冻温度的升高,制备的支架有利于软骨细胞黏附和增殖,电镜观察支架上细胞形态呈球形,有大量的丝状伪足相连。结论在不同的胶原溶胀液浓度和预冻温度的制备条件下制备的胶原多孔支架具有不同孔径结构,进而影响到胶原多孔支架的力学性能,降解性能和细胞相容性等。在本实验所选择孔隙尺寸范围内,孔径越大越有利于软骨细胞的黏附和增殖,胶原溶胀液浓度为0.3%～0.6%和预冻温度为-30～-50℃胶原多孔支架适合软骨细胞的黏附和增殖。
Objective To investigate the effects of collagen concentration and pre-freezing temperature on structure and properties of the scaffold. Method A series of porous collagen scaffolds were fabricated with different collagen concentration and pre-freezing temperature by freezing-drying. The effective pore sizes and other properties of the porous scaffolds were evaluated and compared with each other. Chondrocytes of rabbit were separated and cultured on these scaffolds to evaluate their biocompatibility. Result The collagen scaffolds had interconnected pore ranging from 50 to 200 μm in pore size. With increasing the collagen concentration density and tensile strength of the scaffolds increased, while pore size and degradation rate of the scaffolds decreased, as well as become less homogeneous. Reducing pre-freezing temperature resulted in smaller poresize and slower degradation rate of scaffolds. MTr analyses demonstrated that all the scaffolds availed to cell attachment and proliferation, while increasing collagen concentration and decreasing pre-freezing temperature evidently restrained chondrocytes attachment and proliferation. Conclusion The collagen concentration and pre-freezing temperature have crucial influence on the structure and properties of collagen scaffolds. The suitable collagen scaffolds were obtained by adjusting the collagen concentration and pre-freezing temperature. The bigger of the pore size was. The faster cell proliferation was achieved.
出处
《国际生物医学工程杂志》
CAS
2006年第5期267-271,共5页
International Journal of Biomedical Engineering
关键词
胶原多孔支架
胶原溶胀液浓度
预冻温度
软骨细胞
组织工程
collagen porous scaffolds
collagen solution concentration
pre-freezing temperature
chondrocytes
tissue engineering
