高抗菌性聚乙烯醇/Ag@MOF食品包装膜的制备与表征

为分析银基金属有机框架(Ag@MOF)用于食品包装的可行性，采用流延法制备四种不同的聚乙烯醇(PVA)基食品包装膜(PVA/Ag@MOF、PVA/H₂PYDC、PVA/Ag、PVA)，并研究它们的力学性能、热力学性能、水阻隔性、抗菌性、细胞毒性等。结果表明，与PVA、PVA/H₂PYDC膜相比，Ag@MOF的加入改善了薄膜的力学性能，使薄膜最大拉伸强度提高到36.21 MPa。与PVA、PVA/H₂PYDC、PVA/AgNPs膜相比，Ag@MOF的加入增强了膜的热稳定性。与PVA、PVA/H₂PYDC膜相比，AgNPs和Ag@MOF的刚性结构防止了水的扩散，提高了阻水性能。PVA/Ag@MOF膜对金黄色葡萄球菌和大肠杆菌的抗菌活性也很好，其抗菌活性远大于AgNPs和H₂PYDC复合膜，且具有较低的细胞毒性。因此，PVA/Ag@MOF薄膜是一种很有前景的食品包装材料，可以减少环境微生物对食品的干扰且细胞毒性较低，能够有效提高食品的安全性和储存周期。

Fabrication and Characterization of Antibacterial Polyvinyl Alcohol/Ag@MOF Films for Food Packing

Four different polyvinyl alcohol (PVA) based food packaging films (PVA/Ag@MOF, PVA/H₂PYDC, PVA/Ag, PVA) were prepared by flow-casting method in order to analyze the feasibility of silver based organic framework (Ag@MOF) for food packaging. Their mechanical properties, thermodynamic properties, water barrier, antibacterial and cytotoxicity were studied. The results showed that compared with PVA and PVA/H₂PYDC films, the addition of Ag@MOF improved the mechanical properties of the films, and the maximum tensile strength of the films was increased to 36.21 MPa. Compared with PVA, PVA/H2PYDC and PVA/AgNPs films, the addition of Ag@MOF enhanced the thermal stability of the films. Compared with PVA and PVA/H₂PYDC films, the rigid structures of AgNPs and Ag@MOF prevented the diffusion of water and improved the performance of water resistance. The antibacterial activity of PVA/Ag@MOF membrane againsted Staphylococcus aureus and Escherichia coli was much higher than that of AgNPs and H₂PYDC composite films, and it had low cytotoxicity. Therefore, PVA/Ag@MOF film is a promising food packaging material, which can reduce the interference of environmental microorganisms on food with low cytotoxicity, and improve food safety and storage cycle.