金银花精油微胶囊复合/PLA熔喷非织造材料的制备及其抗菌性能

Preparation of honeysuckle essential oil microcapsule/PLA melt-blown nonwovens and its antibacterial properties

为赋予PLA熔喷材料高效的抗菌性能,将天然抗菌剂金银花精油制成微胶囊后,负载在PLA熔喷材料的表面,制备金银花精油微胶囊复合/PLA熔喷非织造材料,并对复合材料的化学结构、表面形貌、亲水性和抗菌性能等进行分析。结果表明:成功制得以壳聚糖和海藻酸钠为壁材的金银花精油微胶囊,微胶囊的粒径大概为300nm;PLA熔喷材料经多巴胺表面改性后,水接触角从126.9°降至约46.7°,且亲水性显著增加;金银花精油微胶囊能够均匀地固定在PLA熔喷非织造材料表面,与原PLA熔喷材料相比,负载后复合熔喷材料纤维的表面变得粗糙;随着微胶囊负载质量浓度的增加,复合熔喷材料对金黄葡萄球菌和大肠杆菌的抑菌率逐渐上升,当表面负载质量浓度为2.5mg/mL时,对金黄葡萄球菌的抑菌率可达99.9%。

In order to endow high antibacterial properties to poly(lactic acid)(PLA)melt-blown nonwoven(MB),after the natural antibacterial honeysuckle essential oil was made into microcapsules,it was loaded on the surface of PLA melt-blown material,to obtain honeysuckle essential oil microcapsule/PLA melt-blown nonwovens.The chemical structure,surface morphology,hydrophilic and antibacterial properties,etc.of the composite MB were analyzed.The results showed that the honeysuckle essential oil microcapsules were successfully prepared,with chitosan and sodium alginate as wall materials,and the particle size of microcapsules was about 300 nm.After surface modification with dopamine(DA),the water contact angle of PLA MB fell from 126.9°to 46.7°,and the hydrophilicity significantly increased.Honeysuckle essential oil microcapsules can be uniformly fixed on the surface of PLA MB.Compared with original PLA MB,the surface of composite MB became rough after being loaded by microcapsule.With the increase of the loading concentration of honeysuckle essential oil microcapsules,the bacteriostasis rate of composite MB to Staphylococcus aureus and Escherichia coli gradually grew.When the loading concentration of microcapsules was 2.5mg/mL,the bacteriostasis rate to Staphylococcus aureus could reach 99.9%.