聚乳酸纳米纤维基载药敷料的制备与表征

为构筑可自降解、抗菌消炎且轻薄柔软有助于伤口愈合的医用敷料，以聚乳酸为原料，通过掺杂不同质量分数的阿莫西林，采用静电纺丝技术制备聚乳酸纳米纤维基载药敷料。借助扫描电子显微镜、红外光谱仪、X射线衍射仪、接触角测试仪、紫外分光光度计等手段分析纳米纤维膜的微观结构、润湿性能、药物缓释、抗菌性能以及自降解性能。结果表明：聚乳酸纳米纤维敷料具有多孔结构，敷料纤维直径随载药量增加而降低，敷料载药量3%时，纤维平均直径达684 nm;载药聚乳酸纳米纤维基敷料中阿莫西林与聚乳酸没有发生化学反应，避免了阿莫西林的负面改性；聚乳酸纳米纤维基载药敷料润湿性与抗菌性能随载药量增加而增加，载药3%敷料的接触角降到110°,提高了润湿性，对金黄色葡萄球菌的抑菌率可达91%。聚乳酸纳米纤维载药敷料具有较好的自降解性能和平缓的药物缓释能力，适合用作伤口敷料。

Preparation and characterization of polylactic acid nanofiber drug loaded medical dressings

In order to construct a self-degradable, antibacterial, anti-inflammatory, light, thin and soft medical dressings conducive to wound healing, nanofiber drug loaded dressings based on polylactic acid (PLA) was prepared by electrospinning technology with different mass fractions of amoxicillin. The microstructure, wettability, drug release, antibacterial and self-degradation properties of nanofiber films were analyzed by means of scanning electron microscope, infrared spectrometer, X-ray diffraction, contact angle tester and UV spectrophotometer. The results indicate that the PLA nanofiber dressings possess porous structure and the diameter of dressing fiber decreases with the increase of drug loading. When the drug loading is 3%, the average diameter of dressing fiber is 684 nm. There is no chemical reaction between amoxicillin and polylactic acid, suggesting that negative modification did not occur for the amoxicillin. Moreover, the wettability and antibacterial properties of drug loaded PLA nanofiber dressings are enhanced with the increase of drug loading. The antibacterial rate of nanofiber dressings with 3% drug loading is up to 91% for staphylococcus aureus. In addition, polylactic acid nanofiber dressings represent excellent in-vitro degradation performance, drug release ability and stable release rate, which are necessary for wound dressings.