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    用于组织修复的各向异性PVA/HA水凝胶的构建及其性能

    Fabrication and Properties of Anisotropic PVA/HA Hydrogels for Tissue Repair

    • 摘要: 水凝胶因其优异的含水性、良好的生物相容性以及可控的药物释放性能,在创面愈合和组织修复领域作为功能材料而受到关注。本文通过定向冷冻法获得聚乙烯醇/透明质酸(PVA/HA)各向异性水凝胶,通过调节PVA与HA质量比,系统探讨了凝胶的有序化网络结构和组成对其性能的影响。利用扫描电子显微镜(SEM)、旋转流变仪以及紫外-可见分光光度计(UV-Vis)等对水凝胶的微观结构、水合特性及力学性能进行表征。此外,选用小分子罗丹明B(RhB)、大分子牛血清蛋白(BSA-FITC)及原花青素(PC)作为药物模型,建立全浸没与Transwell单侧释药体系,评估结构与组成对药物负载及释放动力学的影响。结果表明,当PVA与HA质量比为3∶3时,凝胶网络在交联密度与链段活动性之间形成相对均衡的结构状态;定向冷冻形成的取向性孔道进一步优化了传质路径,提高了药物扩散效率。此外,CCK-8试剂盒检测结果表明,各组水凝胶浸提液均未对小鼠成纤维细胞产生明显细胞毒性,具有较好的细胞相容性。进一步通过细胞内活性氧(ROS)检测研究表明,负载PC的各向异性水凝胶能够显著降低H2O2诱导的细胞内活性氧水平,可有效缓解氧化应激损伤。

       

      Abstract: In the field of wound healing and tissue repair, hydrogel dressings have attracted significant interest as functional materials due to their excellent water retention, favorable biocompatibility, and controllable drug release capabilities. In this study, anisotropic poly(vinyl alcohol) (PVA)/hyaluronic acid (HA) hydrogels were fabricated using a directional freezing method. By adjusting the mass ratio of PVA to HA, the influence of the ordered network structures and compositions on the hydrogel properties was systematically investigated. The microstructure, hydration behavior, and mechanical properties were characterized using scanning electron microscopy (SEM), rotational rheometry, and Ultraviolet-Visible spectrophotometry. Furthermore, small-molecule Rhodamine B (RhB), macromolecular bovine serum albumin (BSA-FITC), and proanthocyanidins (PC) were selected as model drugs. Using full-immersion and Transwell-based unidirectional release systems, the effects of microstructure and composition on drug loading and release kinetics were evaluated. The results showed that when the mass ratio of PVA to HA was 3∶3, the gel network achieved a relatively balanced structural state between crosslinking density and chain segment mobility. The oriented pores formed by directional freezing further optimized the mass transfer pathway and improved drug diffusion efficiency. Furthermore, the results of CCK-8 assay indicated that none of the hydrogel extracts exhibited significant cytotoxicity to mouse fibroblast cells (L929 cells), demonstrating good cell compatibility. Further intracellular reactive oxygen species(ROS) detection revealed that the PC-loaded anisotropic hydrogel significantly reduced H2O2-induced intracellular reactive oxygen species levels, effectively alleviating oxidative stress damage.

       

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