目的 制作包载纳米磺胺嘧啶银(AgSD)的京尼平交联明胶凝胶,考察其体外抗菌及体内促愈合性能.方法分别配制纳米AgSD与粗粉AgSD梯度浓度混悬液、含纳米AgSD与粗粉AgSD的明胶交联凝胶和不含AgSD的空白凝胶.测量纳米AgSD凝胶对敏感细菌的抑菌圈直径;MTT法考察其对L929成纤维细胞的相容性,测定细胞相对生长率;考察纳米AgSD混悬液对3种敏感细菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC);建立小鼠深Ⅱ度烫伤合并金黄色葡萄球菌感染模型,应用载药凝胶敷料治疗3周后计算愈合指数,天狼星红染色考察小鼠创面胶原沉积,HE染色观察创面组织病理学变化并评分.结果在抑菌圈、MIC和MBC测定实验中,纳米AgSD较粗粉混悬液抗菌性能明显提高,且载纳米AgSD凝胶较市售乳膏有更好的抗菌性及细胞相容性;小鼠创面体内愈合实验中,从给药第2周开始纳米AgSD凝胶组创面愈合指数较涂菌组、乳膏组和粗粉凝胶组显著提升(P<0.05);且与对照组相比,小鼠创面Ⅰ型胶原、总胶原含量及组织病理学评分均明显升高(P<0.05).结论载纳米AgSD明胶凝胶具有良好的体外抗菌效果及快速促机体愈合性能.%Objective To prepare a gelatin hydrogel crosslinked by genipin and loaded with silver sulfadiazine(AgSD) nanoparticles,and test its in vitro anti-bacterial activities and in vivo wound healing enhancing properties. Methods The suspension of AgSD nanoparticles and coarse powder,hydrogels loaded with AgSD nanoparticles and coarse powder were prepared,respectively, and blank gels were used as control. The diameters of inhibition zone of sensitive bacteria were measured;The biocompatibility to L929 cells was studied by MTT method and relative growth rates of the cells were determined. The minimum inhibitory concentration (MIC)and minimum bactericidal concentration(MBC)of 3 sensitive bacteria were tested;DeepⅡdegree scald co-aureus infection mice model was established and the healing index of treatment by drug-loaded hydrogel dressing was calculated within 3 weeks. The collagen deposition was studied after sirius red staining and pathological manifestations were observed after HE staining. Results Compared with AgSD coarse powder,the antibacterial property of AgSD nanoparticles obviously improved in inhibition zone and MIC, MBC experiments. Better biocompatibility and antibacterial property were revealed for AgSD nanoparticles gel group compared with AgSD cream group in MTT assay and inhibition zone studies;Healing index increased significantly since the second week in AgSD nanoparticles gel group compared with staph group,AgSD cream group and AgSD coarse powder gel group in wound-healing experi-ment(P<0.05). Compared with those control groups,nanocrystal gel group had more content of typeⅠcollagen and total collagen, and higher pathology scores(P<0.05). Conclusion AgSD nanocrystal loaded gelatin hydrogel has good antibacterial activity in vitro and high quality healing enhancing property in vivo.
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