College of Biomass Science and Engineering, Sichuan University, Chengdu, China; Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education, Chengdu, China.
Institute of Agro-products Processing Science and Technology (Institute of Food Nutrition and Health), Sichuan Academy of Agricultural Sciences, Chengdu, 610066, China.
Food Chem. 2025 Feb 1;464(Pt 2):141711. doi: 10.1016/j.foodchem.2024.141711. Epub 2024 Oct 18.
The existing films used for fruit preservation suffer from insufficient preservation abilities. This study introduces Cu-tannic acid (Cu-TA) nanoparticles, synthesized from tannic acid (TA) and Cu, to enhance food packaging properties. Integrated into a chitosan-gelatin (CG) matrix, the resultant Cu-TA nanocomposite films exhibit superior antibacterial efficacy and killing rates of Escherichia coli and Staphylococcus aureus more than 99 %, and double the shelf life of strawberries, underscoring the exceptional freshness preservation capabilities of film. Additionally, the tensile strength of the Cu-TA nanocomposite films increased by 1.75 times, the DPPH radical scavenging percentage increased from 29.4 % to 68.4 %, and the water vapor permeability (WVP) decreased by about 60 % compared to the pure CG films. Comprehensive cytotoxicity and migration assessments confirm the safety of film, paving the way for their application in food packaging. The excellent performance of the Cu-TA nanocomposite films positions them as a formidable solution for protecting perishable food items.
现有的水果保鲜薄膜存在保鲜能力不足的问题。本研究引入了铜单宁酸（Cu-TA）纳米粒子，它由单宁酸（TA）和铜合成，用于增强食品包装性能。将其整合到壳聚糖-明胶（CG）基质中，所得的 Cu-TA 纳米复合材料薄膜表现出优异的抗菌效果和对大肠杆菌和金黄色葡萄球菌的杀菌率超过 99%，将草莓的保质期延长一倍，突出了薄膜对保持新鲜度的卓越能力。此外，Cu-TA 纳米复合材料薄膜的拉伸强度提高了 1.75 倍，DPPH 自由基清除率从 29.4%提高到 68.4%，水蒸气透过率（WVP）降低了约 60%，与纯 CG 薄膜相比。综合细胞毒性和迁移评估证实了薄膜的安全性，为其在食品包装中的应用铺平了道路。Cu-TA 纳米复合材料薄膜的卓越性能使其成为保护易腐食品的有力解决方案。
