Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China.
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China.
Int J Biol Macromol. 2022 Aug 31;215:635-645. doi: 10.1016/j.ijbiomac.2022.06.157. Epub 2022 Jun 28.
Xylan could be considered as a good potential candidate for food packaging film because of the vast source and biodegradability, however, its application was restricted by the drawbacks of poor film-forming property, humidity sensitivity, weak mechanical strength and poor antibacterial property. In this paper, xylan was firstly modified by quaternization to improve the film-forming property, then ZnO nanoparticles encapsulated by xylan (nano ZnO@Xylan) was prepared by nanoprecipitation method, finally a series of biodegradable composite films were prepared using quaternized xylan and polyvinyl alcohol with incorporation of nano ZnO@Xylan. The surface morphology, molecular structure and crystallography structure of the films were characterized. The addition of nano ZnO@Xylan decreased water vapor permeability and solubility, meanwhile obviously increased the ultraviolet shielding performance as well as the antibacterial properties of the films. The bacteriostasis rate of the films against E. coli and S. aureus reached up to 99 %. Furthermore, the preservation time of cherry tomatoes covered with ZnO@Xylan/QX/PVA films was extended to at least 21 days. In conclusion, all the results ensure that the fabricated composite films have considerable promising application in the food packaging industry.
木聚糖由于来源广泛和可生物降解性，可以被认为是一种有潜力的食品包装薄膜材料，然而，其应用受到成膜性能差、对湿度敏感、机械强度弱和抗菌性能差等缺点的限制。本文首先通过季铵化对木聚糖进行改性，以提高其成膜性能，然后通过纳米沉淀法制备了木聚糖包裹的氧化锌纳米粒子（纳米 ZnO@木聚糖），最后采用季铵化木聚糖和聚乙烯醇制备了一系列具有生物降解性的复合薄膜，并加入纳米 ZnO@木聚糖。对薄膜的表面形貌、分子结构和结晶结构进行了表征。纳米 ZnO@木聚糖的加入降低了水蒸气透过率和溶解度，同时显著提高了薄膜的紫外屏蔽性能和抗菌性能。薄膜对大肠杆菌和金黄色葡萄球菌的抑菌率达到 99%。此外，用 ZnO@Xylan/QX/PVA 薄膜包裹的樱桃番茄的保鲜时间至少延长至 21 天。总之，所有结果都表明所制备的复合薄膜在食品包装工业中有相当大的应用前景。
