作者:Nina Reger、Wilson Meng、Ellen Gawalt
DOI:10.3390/jfb8020020
日期:——
Titanium and titanium alloy materials are commonly used in joint replacements, due to the high strength of the materials. Pathogenic microorganisms can easily adhere to the surface of the metal implant, leading to an increased potential for implant failure. The surface of a titanium-aluminum-vanadium (Ti-6Al-4V) metal oxide implant material was functionalized to deliver an small antibacterial molecule, nitric oxide. S-nitroso-penicillamine, a S-nitrosothiol nitric oxide donor, was covalently immobilized on the metal oxide surface using self-assembled monolayers. Infrared spectroscopy was used to confirm the attachment of the S-nitrosothiol donor to the Ti-Al-4V surface. Attachment of S-nitroso-penicillamine resulted in a nitric oxide (NO) release of 89.6 ± 4.8 nmol/cm2 under physiological conditions. This low concentration of nitric oxide reduced Escherichia coli and Staphylococcus epidermidis growth by 41.5 ± 1.2% and 25.3 ± 0.6%, respectively. Combining the S-nitrosothiol releasing Ti-6Al-4V with tetracycline, a commonly-prescribed antibiotic, increased the effectiveness of the antibiotic by 35.4 ± 1.3%, which allows for lower doses of antibiotics to be used. A synergistic effect of ampicillin with S-nitroso-penicillamine-modified Ti-6Al-4V against S. epidermidis was not observed. The functionalized Ti-6Al-4V surface was not cytotoxic to mouse fibroblasts.
钛和钛合金材料常用于关节置换,因其具有高强度。病原微生物很容易粘附在金属植入物表面,导致植入物失效的风险增加。钛-铝-钒(Ti-6Al-4V)金属氧化物植入材料表面被功能化处理,以释放一种小分子抗菌物质——一氧化氮。S-亚硝基青霉胺是一种S-亚硝基硫醇型一氧化氮供体,通过自组装单层膜法共价固定在金属氧化物表面。红外光谱技术证实了S-亚硝基硫醇供体成功附着于Ti-Al-4V表面。S-亚硝基青霉胺的附着使材料在生理条件下释放出89.6 ± 4.8 nmol/cm²的一氧化氮(NO)。这种低浓度的一氧化氮分别使大肠杆菌和表皮葡萄球菌的生长减少了41.5 ± 1.2%和25.3 ± 0.6%。结合S-亚硝基硫醇释放的Ti-6Al-4V与常用抗生素四环素,能增加抗生素的效力达35.4 ± 1.3%,从而允许使用更低剂量的抗生素。S-亚硝基青霉胺修饰的Ti-6Al-4V与氨苄西林对表皮葡萄球菌未显示出协同效应。功能化处理的Ti-6Al-4V表面对小鼠成纤维细胞无细胞毒性。