State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
Carbohydr Polym. 2022 Feb 15;278:118957. doi: 10.1016/j.carbpol.2021.118957. Epub 2021 Dec 2.
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）透明薄膜由于其生物降解性和良好的可用性，在食品和医药包装领域引起了广泛关注。通过柠檬酸与尿素和植酸反应，得到了一种新型的含氮磷的碳量子点化合物（NP-CQDs）。NP-CQDs 的存在增加了薄膜的密度，降低了水蒸气的渗透率。引入 4wt%的 NP-CQDs 后，CS 薄膜的水接触角从 79.2°增加到 105.8°。随着 NP-CQDs 的负载量增加，对 UV-A 和 UV-B 透射率的屏蔽作用也增强了。含有 4wt%NP-CQDs 的薄膜对 UV-A 和 UV-B 的阻隔率均超过 90.2%和 96.5%，但仅对可见光的阻隔率为 26.8%。与对照 CS 薄膜相比，该薄膜对大肠杆菌和金黄色葡萄球菌的抗菌活性也更好。这项工作为制备多功能生物安全薄膜提供了一种可行的方法。
