首页> 外文期刊>Acta biomaterialia >Methyl-beta-cyclodextrin modified vascular prosthesis: Influence of the modification level on the drug delivery properties in different media.
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Methyl-beta-cyclodextrin modified vascular prosthesis: Influence of the modification level on the drug delivery properties in different media.

机译:甲基-β-环糊精修饰的血管假体:修饰水平对不同介质中药物递送性质的影响。

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摘要

A textile polyester vascular graft was modified with methyl-beta-cyclodextrin (MebetaCD) to obtain a new implant capable of releasing antibiotics directly in situ at the site of operation over a prolonged period and thereby prevent post-operative infections. We investigated the influence of the curing parameters (time and temperature) that allow control of the degree of functionalization (DF) of the support by MebetaCD. The inclusion of ciprofloxacin (CFX) in the MebetaCD cavity was observed in solution by two-dimensional (1)H NMR spectroscopy. The amount of CFX loaded on the modified graft increased with DF. Depending on the release medium (water, phosphate-buffered saline, or human plasma) and the DF of the prostheses, different kinetic profiles of release of CFX were obtained. The sustained release of CFX in human plasma was shown by microbiological assays that indicated prolonged antimicrobial activity against Staphylococcus aureus and Escherichia coli. Viability tests demonstrated the non-toxicity of MebetaCD to an epithelial cell line (HPMEC), although a decrease in endothelial cell number was observed on the functionalized prosthesis, probably due to the roughness of the coating and also to the nature of the MebetaCD polymer present on the surface of the fibers.
机译:用甲基-β-环糊精(MebetaCD)修饰了一种聚酯纤维血管移植物,从而获得了一种新型植入物,该植入物能够长时间在手术部位直接就地释放抗生素,从而防止术后感染。我们研究了固化参数(时间和温度)的影响,这些参数允许通过MebetaCD控制载体的官能度(DF)。通过二维(1)H NMR光谱观察到溶液中MebetaCD腔中包含环丙沙星(CFX)。负载在改性移植物上的CFX量随着DF的增加而增加。根据释放介质(水,磷酸盐缓冲液或人血浆)和假体的DF,获得不同的CFX释放动力学曲线。微生物测定表明CFX在人血浆中的持续释放,表明对金黄色葡萄球菌和大肠杆菌的抗菌活性延长。可行性测试表明,MebetaCD对上皮细胞系(HPMEC)无毒,尽管在功能化假体上观察到内皮细胞数量减少,这可能是由于涂层的粗糙度以及存在的MebetaCD聚合物的性质所致在纤维表面上。

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