【摘要】 果蔬进入生鲜超市等温暖湿润的环境后容易滋生细菌、造成腐败,为延长果蔬货架期,本实验以壳聚糖为成膜基材,以ZAISe/ZnS量子点为光敏材料制备ZAISe/ZnS油溶性核壳量子点,将其转为水相后与壳聚糖复合,制成量子点/壳聚糖复合膜并测定复合膜的理化性质,同时,通过抑菌实验研究该复合膜在光照和黑暗条件下对大肠杆菌以及金黄色葡萄球菌的抑制效果。结果表明:与单一的壳聚糖膜相比,量子点的加入改善了壳聚糖膜的抑菌性能,量子点/壳聚糖复合膜溶液在光照条件下对金黄色葡萄球菌和大肠杆菌都表现出极显著的抑菌效果。由于量子点/壳聚糖复合膜在光照条件下表现出优异的抑菌效果,且所添加量子点安全无毒,因此该复合膜有望应用于果蔬等保鲜领域。更多还原

【Abstract】 ZAISe/ZnS oil-soluble core-shell quantum dots, prepared with chitosan as film-forming material and ZAISe/ZnS quantum dots as photosensitive material, were transferred into a water phase for combination with chitosan to prepare quantum dot/chitosan composite film, and its physicochemical properties and inhibitory effect on Escherichia coli and Staphylococcus aureus under light and dark conditions were evaluated. The results showed that the quantum dot/chitosan composite film solution possessed more significant bacteriostatic effects under light conditions compared with chitosan film.Owing to this as well as the fact that quantum dots are safe and non-toxic, the composite film is expected to be applied in the preservation of fruits and vegetables.更多还原