低溶胀壳聚糖/丝素蛋白复合膜的制备及性能测试

为改善单纯壳聚糖膜用作医用创面敷料在湿环境下的力学性能,将壳聚糖(CS)和家蚕丝素蛋白(SF)混合,采用延流法制备壳聚糖/丝素蛋白(CS/SF)复合膜。物理与机械性能测试表明:CS/SF复合膜的溶胀率较单纯CS膜显著降低,且其溶胀能力具有pH依赖性;CS/SF复合膜的水蒸气透过率较单纯CS膜略有下降,但仍保持在2 043～3 363 g/(m2.d);CS/SF复合膜在湿环境下的力学强度较单纯CS膜显著提高,当加入SF的质量分数为15%时,复合膜的力学性能最好,其拉伸强度为34.5 MPa±1.8 MPa,比单纯CS膜提高近18%,而其断裂伸长率也由初始的83.1%±6.7%提高到119.3%±8.2%。CS/SF复合膜具有较好的药物释放性能,对抗感染药物盐酸万古霉素表现出在初始1 h内的突释行为和随后较长时期的缓释行为,十分有利于降低感染和加速伤口愈合。此外,CS/SF复合膜对STO小鼠胚成纤维细胞具有良好的生物相容性。各项性能测试显示CS/SF复合膜作为医用敷料具有潜在的应用前景。     

聚乙交酯-丙交酯泡沫材料的生物学评价

为了解聚乙交酯-丙交酯(PLGA)多孔聚合物支架材料进一步作为组织工程种子细胞支架材料的安全性,通过细胞毒性试验和肌内植入试验,对PLGA的生物相容性和可降解性进行了检测和评价。结果表明,PLGA泡沫材料的毒级为0～1级,在体外细胞培养试验中显示了良好的细胞相容性;术后各时间点,材料植入处肌组织无明显炎症反应,随着时间推移,泡沫材料占位空间逐渐缩小,证实了植入材料的可降解性。说明PLGA可以作为组织工程研究的细胞外基质材料。     

EDC交联的明胶微球支架制备及其生物相容性研究

目的制备EDC交联的明胶微球作为支架材料,并对其生物相容性进行评价,为构建工程化的脂肪组织奠定基础．方法制备明胶微球,并利用5mmol EDC对其进行交联,获得75—150μm粒径大小的微球;扫描电镜观察,检测微球的细胞相容性和组织相容性．结果经EDC交联的明胶微球均呈圆球体,大小比较均匀,粒径75～150μm,细胞毒性等级为0～I级;将微球植入sD大鼠皮下,植入部位未见明显红肿,伤口无红肿、渗液等炎性反应,组织学观察植入明胶微球局部无明显炎症细胞浸润,静态培养时脂肪组织来源干细胞（ADSCs）在微球上生长状态良好．结论EDC交联的明胶微球是一种具有较好的细胞亲和性、生物相容性和生物可降解性的天然高分子支架材料,以脂肪组织来源干细胞为种子细胞,可以为临床使用提供一种工程化脂肪组织填充物．     

选区激光熔化TC4生物腐蚀和生物相容性分析

选区激光熔化(SLM)为降低TC4钛合金医用植入体的弹性模量、减小应力屏蔽效应提供了一种有效的解决方案,但这种材料在投入实际应用前尚需有充分的生物安全性评价。采用SLM技术制备出致密度为99.5%的TC4合金,通过电化学实验、溶血实验和细胞毒性实验测试了SLM成形TC4的生物腐蚀性能和生物相容性,并与传统铸轧工艺制备的合金进行了对比。实验结果表明：前者相比于后者有着更好的耐蚀性能,并且SLM成形TC4还具有优良的生物相容性,在生物医用植入物方面展现出很好的应用前景。     

可注射性壳聚糖基温敏性凝胶的制备及其生物相容性

以壳聚糖(Chitosan,CH)为基,加入不同配比的β-甘油磷酸钠(Glycerophosphate salt,GP)和羟乙基纤维素(Hydroxyethyl cellulose,HEC)制备成不同组成的壳聚糖基温敏性凝胶体系.研究了2种凝胶体系初始凝胶化温度、成凝胶化时间、在缓冲溶液中的溶胀性、对骨髓间充质干细胞的...     

液芯胶囊材料对保加利亚乳杆菌生长的影响

分析液芯胶囊组分中的氯化钙、黄原胶含量以及液芯胶囊碎片和利用液芯胶囊固定化培养对保加利亚乳杆菌生长的影响,探讨液芯胶囊对保加利亚乳杆菌生长的影响。在MRS培养基中添加不同浓度的氯化钙、黄原胶和液芯微胶囊碎片培养保加利亚乳杆菌,并用液芯生物微胶囊进行固定化培养保加利亚乳杆菌。结果显示:黄原胶对保加利亚乳杆菌的生长基本没有影响;高浓度的CaCl2对保加利亚乳杆菌的生长有明显的抑制作用,并且随浓度的增高抑制作用越发明显,甚至产生毒害作用。液芯微胶囊碎片以及液芯微胶囊对保加利亚乳杆菌均显示了良好的生物相容性。表明其作为整个体系来说,具有良好的生物相容性,该微胶囊可用于微生物细胞的固定化培养。     

Selection of Culture Conditions and Cell Morphology for Biocompatible Extraction of β-Carotene from Dunaliella salina

Biocompatible extraction emerges recently as a means to reduce costs of biotechnology processing of microalgae. In this frame, this study aimed at determining how specific culture conditions and the associated cell morphology impact the biocompatibility and the extraction yield of β-carotene from the green microalga Dunaliella salina using n-decane. The results highlight the relationship between the cell disruption yield and cell volume, the circularity and the relative abundance of naturally permeabilized cells. The disruption rate increased with both the cell volume and circularity. This was particularly obvious for volume and circularity exceeding 1500 µm³ and 0.7, respectively. The extraction of β-carotene was the most biocompatible with small (600 µm³) and circular cells (0.7) stressed in photobioreactor (30% of carotenoids recovery with 15% cell disruption). The naturally permeabilized cells were disrupted first; the remaining cells seems to follow a gradual permeabilization process: reversibility (up to 20 s) then irreversibility and cell disruption. This opens new carotenoid production schemes based on growing robust β-carotene enriched cells to ensure biocompatible extraction.     

Production,Characterization and Biocompatibility of Marine Collagen Matrices from an Alternative and Sustainable Source: The Sea Urchin Paracentrotus lividus

Collagen has become a key-molecule in cell culture studies and in the tissue engineering field. Industrially, the principal sources of collagen are calf skin and bones which, however, could be associated to risks of serious disease transmission. In fact, collagen derived from alternative and riskless sources is required, and marine organisms are among the safest and recently exploited ones. Sea urchins possess a circular area of soft tissue surrounding the mouth, the peristomial membrane (PM), mainly composed by mammalian-like collagen. The PM of the edible sea urchin Paracentrotus lividus therefore represents a potential unexploited collagen source, easily obtainable as a food industry waste product. Our results demonstrate that it is possible to extract native collagen fibrils from the PM and produce suitable substrates for in vitro system. The obtained matrices appear as a homogeneous fibrillar network (mean fibril diameter 30–400 nm and mesh < 2 μm) and display remarkable mechanical properties in term of stiffness (146 ± 48 MPa) and viscosity (60.98 ± 52.07 GPa·s). In vitro tests with horse pbMSC show a good biocompatibility in terms of overall cell growth. The obtained results indicate that the sea urchin P. lividus can be a valuable low-cost collagen source for mechanically resistant biomedical devices.     

几种杀菌剂对源于蛴螬的绿僵菌菌株QC的生物相容性研究

为了明确生防菌绿僵菌与常用杀菌剂之间的相容性,本文检测了8种常用杀菌剂对生防菌绿僵菌Metarhizium anisopliae QC孢子萌发和菌丝生长的影响。结果表明:几种供试杀菌剂与绿僵菌的相容性均比较差,同时对绿僵菌菌株QC的抑制作用均随浓度的增大而增强。其中,10%苯醚甲环唑和50%多菌灵相容性最差,即使在稀释浓度10 000倍作用下对绿僵菌QC菌株菌丝体生长抑制率可达到100%,几乎完全抑制绿僵菌菌株QC菌丝生长和孢子的萌发。其他6种化学杀菌剂在常规使用浓度下对绿僵菌菌株QC的抑制作用也是极强。因此,在田间施用杀菌剂时,需避免这几种化学杀菌剂与绿僵菌菌株QC的混用,以达到最佳的防治效果。     

一种肌腱缝合线的生物相容性

为研究一种新型可吸收肌腱缝合线的生物相容性,在细胞毒性试验的基础上,进行了全身急性毒性、溶血、热原、皮肤刺激等试验,并对试验数据进行分析和评估,结果显示,肌腱缝合线的急性毒性、溶血、热原、皮肤刺激试验均为阴性,从而说明了这种缝合线的生物相容性好,是理想的生物医用材料。