首页> 外文期刊>Acta biomaterialia >In vitro microbial inhibition and cellular response to novel biodegradable composite wound dressings with controlled release of antibiotics.
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In vitro microbial inhibition and cellular response to novel biodegradable composite wound dressings with controlled release of antibiotics.

机译:对新型生物可降解复合伤口敷料的体外微生物抑制和细胞反应,并控制抗生素的释放。

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About 70% of all people with severe burns die from related infections, despite advances in treatment regimens and the best efforts of nurses and doctors. Although silver-eluting wound dressings are available for addressing this problem, there is growing evidence of the deleterious effects of such dressings in delaying the healing process owing to cellular toxicity. A new concept of antibiotic-eluting composite wound dressings is described here. These dressings are based on a polyglyconate mesh coated with a porous poly-(dl-lactic-co-glycolic acid) matrix loaded with antibiotic drugs. The effect of antibiotic release on bacterial inhibition was studied, and cell cytotoxicity was examined. The dressings resulted in a 99.99% decrease in the viable counts of Pseudomonas aeruginosa and Staphylococcus albus at very high initial inoculations of 10-10 CFU ml(1) after only 1 day, while such a decrease in Staphylococcus aureus was obtained within 3 days. Bacterial inhibition zones around the dressing material were found to persist for 2 weeks, indicating a long-lasting antimicrobial effect. Despite severe toxicity to bacteria, the dressing material was found to have no toxic effect on cultured fibroblasts, indicating that the new antibiotic-eluting wound dressings represent an effective option for selective treatment of bacterial infections.
机译:尽管治疗方案有所进步,而且护士和医生尽了最大努力,但仍有约70%的严重烧伤患者死于相关感染。尽管洗脱银的伤口敷料可用于解决该问题,但是越来越多的证据表明,由于细胞毒性,这种敷料在延迟愈合过程中具有有害作用。本文介绍了一种抗生素洗脱复合伤口敷料的新概念。这些敷料基于涂有多孔聚-(dl-乳酸-乙醇酸共聚物)基质的聚甘油酸酯网,所述基质负载了抗生素药物。研究了抗生素释放对细菌抑制的影响,并检查了细胞的细胞毒性。敷料仅在第1天就以10-10 CFU ml(1)很高的初始接种量使铜绿假单胞菌和白色葡萄球菌的活菌计数降低了99.99%,而在3天内获得了这种金黄色葡萄球菌的降低。发现敷料周围的细菌抑制区持续2周,表明抗菌效果持久。尽管对细菌有严重的毒性,但发现敷料对培养的成纤维细胞没有毒性作用,这表明新型的抗生素洗脱伤口敷料代表了选择性治疗细菌感染的有效选择。

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