背景:目前对于肠外瘘的外科手术治疗手段有待改进,寻求一种人工合成水凝胶代替纤维蛋白凝胶作为封堵材料势在必行.目的:制备出可注射可降解抗菌水凝胶材料,并检测其体外生物学性能.方法:以水溶性壳聚糖(S-Cts)和氧化海藻酸钠(O-Alg)为原料,采用席夫碱反应制备原位成型凝胶,在此基础上加入氧化还原反应得到的纳米银(nano-Ag)颗粒,形成S-Cts/O-Alg/nano-Ag复合水凝胶.观测凝胶时间和微观形貌,通过模拟生理环境溶液,检测复合水凝胶的溶胀性能、降解性能以及抗菌性能.结果与结论:①水溶性壳聚糖与氧化海藻酸钠的组分含量越接近,凝胶时间越短,并可以控制在外科手术所需范围内;②2种组分含量的变化会影响形成凝胶的微观结构形貌,水溶性壳聚糖组分含量越大,凝胶网络结构越致密;③复合凝胶具备优秀的溶胀性能,在含有胰蛋白酶的模拟肠液中相比在磷酸盐缓冲溶液中降解速率更快;④凝胶组分中加入纳米银微粒,有效提升了凝胶的抗菌性能;⑤这种材料弥补了单纯天然高分子材料的生物相容性、生物可降解性以及在抑菌能力上的不足,具备一定研究价值和应用前景.%BACKGROUND: As the surgical treatment for intestinal fistulas nowadays needs to be improved, we are seeking a new kind of artificially synthesized hydrogel to replace fibrin gels as the sealing gel, which is imperative for both economic and social benefits.OBJECTIVE: To prepare a degradable antibacterial composite hydrogel and to detect the in vitro biological properties. METHODS: In this study, we combined soluble chitosan (S-Cts) with oxidized alginate (O-Alg) to prepare the injectable and degradable hydrogel under Schiff base reaction. Besides, nanosilver (nano-Ag) particles were added to obtain S-Cts/O-Alg/nano-Ag composite hydrogel. Gelation time, microstructure, swelling, degradation, and antibacterial properties of the composite hydrogel were observed and detected in simulated physiological environment. RESULTS AND CONCLUSION: The closer constituent contents of water-soluble chitosan and sodium alginate indicate the shorter gelation time, and the time could be controlled within the range of surgery. The variation in the constituent content of the two components can affect the hydrogel microstructure. The higher constituent content of water-soluble chitosan implicates the denser network of the hydrogel. The composite hydrogel has excellent swelling properties, and it degrades faster in the simulated intestinal fluid containing trypsin than in the PBS. Moreover, adding nanosilver particles can bring certain antibacterial properties. This hydrogel has better biocompatibility, biodegradability and antibacterial ability than natural macromolecules, and has certain research value and application prospect.
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