Preparation and characterization of the silk fibroin/ hydroxyapatite composites
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摘要: 为了改善羟基磷灰石( HAP) 的脆性和新骨诱导性, 采用共沉淀法合成HAP , 盐溶法制备丝素蛋白(SF) , 在胶体状态下将HAP 和SF 复合得到了SF/ HAP 复合材料。采用扫描电镜(SEM) 、X 射线衍射(XRD) ,傅立叶红外光谱( FIR) 对复合材料结构和化学组成进行了分析, 在模拟体液中检验了复合材料的生物活性, 并对其抗压强度进行了测定。结果表明: HAP 与SF 在纳米尺度进行了复合, 复合材料中SF 主要以β-折叠构象存在,酰胺Ⅴ红外特征峰消失,β-折叠构象的其他峰发生了移动, 表明HAP 与SF 间存在化学结合; 模拟体液中浸泡18 天后, 复合材料表面形成了片层状的HAP ; 与纯的HAP 晶体比较, 复合材料结构稳定, 具有较好生物活性和骨诱导性, 其抗压强度可达63 MPa , 可望成为理想的骨组织替换和工程支架材料。Abstract: In order to improve hydroxyapatite ( HAP) brittleness and osteo -inductivity , HAP was prepared usingthe co-precipitation method. Silk-fibroin (SF) was obtained by salt-resolving. The SF/ HAP composite was derivedby mixing HAP sols with SF sols. The phase composition and morphology of HAP and SF/ HAP composites wereinvestigated using X-ray diff raction (XRD) , scanning elect ron microscopy (SEM) and Fourier inf rared spect roscopy( FIR) . The compressive st rength of the SF/ HAP composites was also measured. The biological activity of the SF/HAP composites was observed while thermostatic held in simulated body fluid (SBF) . The result s show that HAPmixes with SF in the SF/ HAP composites at the nano-scale. The SF in the SF/ HAP composites mainly has the typical silk Ⅱconformation (β-sheet) . The pect ral peak of acyl Ⅴofβ-sheet conformation disappears and the positionsof the other spect ral peaks ofβ-sheet conformation in the SF/ HAP composites are changed , which indicates that thechemical bonds are formed between SF and HAP granules. When the SF/ HAP composite is dipped in SBF for eighteen days , the needle-like HAP sheet is formed on the surface. The compressive st rength of the SF/ HAP compositesreaches 63 MPa. It is clear that the SF/ HAP composite is a desirable biomedical material for the repairing of bonedefect s with an excellent bioactivity , osteo-inductivity and high mechanical st rength.
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