Enhancing the thermostability, UV shielding and antimicrobial activity of transparent chitosan film by carbon quantum dots containing N/P
作者：Lei Wang, Xiaodong Liu, Peng Qi, Jun Sun, Shengling Jiang, Hongfei Li, Xiaoyu Gu, Sheng Zhang
關(guān)鍵字：通過含有 N/P 的碳量子點(diǎn)增強(qiáng)透明殼聚糖薄膜的熱穩(wěn)定性、紫外線屏蔽和抗菌活性
論文來源：期刊
發(fā)表時(shí)間：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.
殼聚糖（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藥品包裝領(lǐng)域備受關(guān)注。通過檸檬酸、尿素和植酸反應(yīng)獲得了一種新型的含氮和磷的碳量子點(diǎn)化合物（NP-CQDs）。由于 NP-CQDs 的存在，薄膜的密度增加，水蒸氣滲透率降低。4 wt% NP-CQDs 的引入使 CS 薄膜的水接觸角從 79.2° 增加到 105.8°。隨著 NP-CQDs 的加入，對 UV-A 和 UV-B 透射率的屏蔽增加。含有 4 wt% NP-CQDs 的薄膜阻擋了 90.2% 以上的 UV-A 和 96.5% 以上的 UV-B；然而，它只阻擋了 26.8% 的可見光。并且，也有較好的抗菌活性而?。大腸桿菌和S。aureus比對照 CS 片。該工作為制備多功能生物安全膜提供了一種可行的方法。