State Key Laboratory of Food Science and Technology, Nanchang University, No.235 Nanjing East Road, Nanchang 330047, China.
State Key Laboratory of Food Science and Technology, Nanchang University, No.235 Nanjing East Road, Nanchang 330047, China; School of Resources, Environmental, and Chemical Engineering, Nanchang University, No.999 Xuefu Avenue, Nanchang 330031, China.
Int J Biol Macromol. 2019 Dec 1;141:207-217. doi: 10.1016/j.ijbiomac.2019.08.257. Epub 2019 Aug 31.
The pectin (CEP) was used as matrix material to prepare Ag@AgCl/ZnO nanocomposites with a green method for photocatalytic antibacterial activity in visible-light. Briefly, Ag@AgCl plasmonic hybrids were prepared in the CEP macromolecule matrix with size control, which was attributed to the stability of carboxyl and hydroxyl groups on the CEP. Subsequently, an effective and green two-steps approach was explored for the fabrication of CEP-Ag@AgCl/ZnO nanocomposites with resource saving and environment friendly. Interestingly, more Ag was converted into metallic Ag in the CEP-Ag@AgCl/ZnO than that in the CEP-Ag@AgCl. This phenomenon was attributed that the reducibility of free hemiacetal hydroxyl groups on CEP was realized with the help of NaOH in the preparation of CEP-ZnO. In addition, the CEP chains were not obviously destroyed except for the change in the crystallinity after the preparation of the CEP-Ag@AgCl/ZnO nanocomposites, indicating that the method was non-destructive. Moreover, the pH triggered release of Zn and low release of Ag in CEP-Ag@AgCl/ZnO nanocomposites with excellent photocatalytic antibacterial activity were confirmed in this work. The proposed green process provides a new idea for the large-scale production of antibacterial pectin-based nanocomposites in industry with a low-cost.
以果胶（CEP）为基质材料，采用绿色方法制备具有可见光下光催化抗菌活性的 Ag@AgCl/ZnO 纳米复合材料。简要地说，CEP 大分子基质中制备了尺寸可控的 Ag@AgCl 等离子体杂化体，这归因于 CEP 上羧基和羟基的稳定性。随后，探索了一种有效且绿色的两步法来制备具有资源节约和环境友好的 CEP-Ag@AgCl/ZnO 纳米复合材料。有趣的是，CEP-Ag@AgCl/ZnO 中的 Ag 比 CEP-Ag@AgCl 中的 Ag 更多地转化为金属 Ag。这种现象归因于在 CEP-ZnO 的制备过程中，NaOH 实现了 CEP 上游离半缩醛羟基的还原性。此外，除了结晶度的变化外，CEP-Ag@AgCl/ZnO 纳米复合材料的制备过程并未明显破坏 CEP 链，表明该方法是非破坏性的。此外，在具有优异光催化抗菌活性的 CEP-Ag@AgCl/ZnO 纳米复合材料中证实了 pH 触发的 Zn 释放和 Ag 的低释放。该绿色工艺为工业上大规模生产低成本抗菌果胶基纳米复合材料提供了新的思路。
