生物型抗菌盆底修复材料的制备与性能

Preparation and performance of biologic antimicrobial materials for pelvic tissue repair

背景:哺乳动物细胞外基质组成的生物型修复材料,在盆底组织修复及功能重建方面表现出较大潜力,但细菌感染对生物型修复材料的功能破坏是其中的一个较大问题。目的:制备具备抗菌功能的生物型盆底修复材料。方法:以壳聚糖为基质材料,通过静电吸附和自凝聚纳米粒制备技术获得包载有不同质量浓度替加环素(25,50,100 g/L)的壳聚糖大分子纳米粒混合液,再通过表面涂层技术将其涂覆于细胞外基质材料表面,制得抗菌细胞外基质材料。结果与结论:红外光谱显示,抗菌细胞外基质材料出现壳聚糖的典型糖环骨架振动峰,并且在3 359 cm-1左右峰明显增宽,表明抗菌剂复合涂层修饰成功,由于替加环素的用量非常小,其红外图谱中未能显示其特征吸收峰。扫描电镜观察显示,抗菌细胞外基质材料保存了细胞外基质材料多层排列有序纤维丝构成的主体结构,并且在微丝表面和微丝之间还明显附着一层蓬松鳞片状涂层物质,材料微表面三维孔洞变小,但仍维持多孔连通特性。抑菌圈实验显示,抗菌细胞外基质材料对大肠杆菌和金黄色葡萄球菌具有良好的抗菌性能,并且随着抗菌剂浓度的增大,抑菌圈直径显著增加。

BACKGROUND：The biological extracellular matrix materials become the focus of pelvic floor repair materials research because of its excellent biocompatibility and mechanical compatibility. However, bacterial infection can damage the function of biological repair materials. OBJECTIVE：To prepare the biologic antimicrobial materials for pelvic tissue function repair. METHODS：Chitosan and tigecycline-loaded chitosan nanoparticles suspension was prepared by the electrostatic adsorption and self-aggregation of nanoparticles preparation techniques. Then the suspension was coated onto the surface of extracellular matrix materials. The morphological examination was performed by scanning electron microscope. The antibacterial property was detected by solid plate microbial culture method. RESULTS AND CONCLUSION：Infrared spectra displayed that aromatic ring skeleton vibration peak of chitosan occurred on the biologic antimicrobial materials, and it was significantly widened at about 3 359 cm^-1, indicating the composite coating was successful to modify the surface of extracellular matrix materials. As a very smal dose of tigecycline, there was no characteristic absorption peak on the infrared spectra. Scanning electron microscopy showed the porous structure of the material surface with some nanoparticles adhesion. The prepared materials had good antibacterial properties on Staphylococcus aureus and Escherichia coli, and the inhibition zone diameter was significantly increased with the increasing concentration of antibacterial agent. The biologic antimicrobial materials for pelvic tissue function repair were prepared successfully.