Gao Wenting, Mu Bin, Yang Fangfang, Li Yalong, Wang Xiaomei, Wang Aiqin
Key Laboratory of Clay Minerals of Gansu Province, Research Center of Resource Chemistry and Energy Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, PR China.
Key Laboratory of Clay Minerals of Gansu Province, Research Center of Resource Chemistry and Energy Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, PR China.
Int J Biol Macromol. 2024 Nov;280(Pt 4):136042. doi: 10.1016/j.ijbiomac.2024.136042. Epub 2024 Sep 26.
In order to fulfill people's requirements for food quality and safety, it is a promising strategy to develop intelligent biodegradable food packaging materials. Herein, honeysuckle extracts/attapulgite/chitosan composite films containing natural carbon dots were fabricated for intelligent food packaging. Different characterization techniques were employed to study the obtained composite films, while the physicochemical properties, optical properties, antibacterial and antioxidant activities of composite films were determined. The obtained composite films presented good mechanical, antibacterial and antioxidant properties, and the antibacterial ratios of composite films against Escherichia coli and Staphylococcus aureus were 99.27 ± 0.18 % and 98.85 ± 0.65 %, respectively. When the added amount of honeysuckle extracts/attapulgite nanocomposites was 4.76 %, the tensile strength and elongation at break of composite films reached 24.9 ± 2.35 MPa and 64.8 ± 2.11 %, respectively, which were obviously higher than that of pure chitosan film. Furthermore, the composite films exhibited excellent UV shielding and blue fluorescence properties, as well as pH-sensitivity due to the presence of caffeoquinic acid-based natural carbon dots derived from honeysuckle extract. Therefore, the composite films indicated a potential application for intelligent food packaging.
为了满足人们对食品质量和安全的要求，开发智能可生物降解食品包装材料是一种很有前景的策略。在此，制备了含有天然碳点的金银花提取物/凹凸棒石/壳聚糖复合薄膜用于智能食品包装。采用不同的表征技术对所得复合薄膜进行研究，同时测定复合薄膜的物理化学性质、光学性质、抗菌和抗氧化活性。所得复合薄膜具有良好的机械性能、抗菌和抗氧化性能，复合薄膜对大肠杆菌和金黄色葡萄球菌的抗菌率分别为99.27±0.18%和98.85±0.65%。当金银花提取物/凹凸棒石纳米复合材料的添加量为4.76%时，复合薄膜的拉伸强度和断裂伸长率分别达到24.9±2.35MPa和64.8±2.11%，明显高于纯壳聚糖薄膜。此外，由于金银花提取物中基于咖啡奎宁酸的天然碳点的存在，复合薄膜表现出优异的紫外线屏蔽和蓝色荧光性能以及pH敏感性。因此，复合薄膜在智能食品包装方面具有潜在的应用前景。
