作者：Lei Wang, Xiaodong Liu, Peng Qi, Jun Sun, Shengling Jiang, Hongfei Li, Xiaoyu Gu, Sheng Zhang
关键字：通过含有 N/P 的碳量子点增强透明壳聚糖薄膜的热稳定性、紫外线屏蔽和抗菌活性
论文来源：期刊
发表时间：2021年

The chitosan (CS) transparent film has attracted much attention in food and medicine packaging areas due to their biodegradability and good availability. A novel carbon quantum dots compound containing nitrogen and phosphorus (NP-CQDs) was obtained by reacting citric acids, with urea and phytic acids. The density of the film was increased, and the water vapor permeation was reduced by the presence of NP-CQDs. The introduction of 4 wt% NP-CQDs increased the water contact angle of the CS film from 79.2° to 105.8°. The shielding on UV-A and UV-B transmittance was increased with the NP-CQDs loading. The film containing 4 wt% NP-CQDs blocked more than 90.2% UV-A and 96.5% UV-B; however, it only blocked 26.8% visible light. It also exhibited better antibacterial activity to both E. coli and S. aureus than the control CS film. This work provided a feasible way to prepare multifunctional bio-safe film.

壳聚糖（CS）透明薄膜因其可生物降解性和良好的可用性而在食品和药品包装领域备受关注。通过柠檬酸、尿素和植酸反应获得了一种新型的含氮和磷的碳量子点化合物（NP-CQDs）。由于 NP-CQDs 的存在，薄膜的密度增加，水蒸气渗透率降低。4 wt% NP-CQDs 的引入使 CS 薄膜的水接触角从 79.2° 增加到 105.8°。随着 NP-CQDs 的加入，对 UV-A 和 UV-B 透射率的屏蔽增加。含有 4 wt% NP-CQDs 的薄膜阻挡了 90.2% 以上的 UV-A 和 96.5% 以上的 UV-B；然而，它只阻挡了 26.8% 的可见光。并且，也有较好的抗菌活性而?。大肠杆菌和S。aureus比对照 CS 片。该工作为制备多功能生物安全膜提供了一种可行的方法。