Wang Liping, Li Yukun, Ye Lei, Zhi Chaohui, Zhang Tao, Miao Ming
State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.
Jiangsu Longjun Environmental Protection Industrial Development Co., Ltd., Changzhou, Jiangsu 213000, China.
Int J Biol Macromol. 2024 Sep;276(Pt 1):133836. doi: 10.1016/j.ijbiomac.2024.133836. Epub 2024 Jul 14.
This study explored the structure and performance of starch-based antibacterial films reinforced with black tea cellulose nanocrystals (BT-CNCs). The optimal addition amount of BT-CNCs is 5 % (w/w Starch). This nanocrystal-infused film, incorporating chitosan (CS), ε-polylysine (ε-PL), and zinc oxide nanoparticles (ZnONP) as antibacterial agents, exhibited a smooth, continuous surface. The addition of BT-CNCs and antibacterial agents did not change the group characteristic peaks of the film, but changed the crystallinity slightly. The films, namely St, St/CNCs, St/CNCs/CS, and St/CNCs/ε-P, maintained high light transmittance (above 80 %), except for the St/CNCs/ZnONP film, which effectively shielded UV radiation. The combined use of antibacterial agents and BT-CNCs enhanced the water and oxygen barrier properties of the film. Notably, the St/CNCs/CS film exhibited the lowest solubility (17.74 % ± 0.36) and the highest tensile strength (14.23 ± 0.16 MPa). The antibacterial efficacy of the films decreased in the order of St/CNCs/ZnONP, St/CNCs/ε-PL, and St/CNCs/CS, with a more pronounced inhibitory effect on E. coli compared to S. aureus. This study marries natural waste recycling with cutting-edge food packaging technology, setting a new benchmark for the development of sustainable packaging materials.
本研究探讨了用红茶纤维素纳米晶体（BT-CNCs）增强的淀粉基抗菌薄膜的结构与性能。BT-CNCs的最佳添加量为5%（相对于淀粉的质量分数）。这种注入了纳米晶体的薄膜，加入了壳聚糖（CS）、ε-聚赖氨酸（ε-PL）和氧化锌纳米颗粒（ZnONP）作为抗菌剂，呈现出光滑、连续的表面。BT-CNCs和抗菌剂的添加并未改变薄膜的基团特征峰，但略微改变了结晶度。除了能有效屏蔽紫外线辐射的St/CNCs/ZnONP薄膜外，St、St/CNCs、St/CNCs/CS和St/CNCs/ε-P薄膜均保持较高的透光率（高于80%）。抗菌剂与BT-CNCs的联合使用增强了薄膜的阻水和阻氧性能。值得注意的是，St/CNCs/CS薄膜的溶解度最低（17.74%±0.36），拉伸强度最高（14.23±0.16兆帕）。薄膜的抗菌效果依次为St/CNCs/ZnONP、St/CNCs/ε-PL和St/CNCs/CS，对大肠杆菌的抑制作用比对金黄色葡萄球菌更明显。本研究将天然废弃物回收与前沿食品包装技术相结合，为可持续包装材料的开发树立了新的标杆。
