以聚乙烯醇（PVA）为主要原料，从绿茶中提取黄酮类化合物，作为抗菌剂，制备抗菌性能良好的绿茶黄酮提取物/PVA薄膜。采用复合酶解法提取绿茶中总黄酮，测定绿茶中总黄酮的抗氧化活性以及抑菌能力。将绿茶提取液与PVA按比例混合，用流延涂板法制成复合保鲜膜。结果表明：绿茶提取液与PVA的体积比为4∶6最为合适，具有较好的力学性能和光学性能。绿茶中总黄酮的还原力与吸光度呈正相关，DPPH自由基清除率在85%~90%之间，OH自由基清除率在25%~50%之间。绿茶提取液对金黄色葡萄球菌、大肠杆菌和单增李斯特菌均有明显的抑菌效果。绿茶/PVA复合膜对金黄色葡萄球菌的抑菌圈直径为8.60 mm，其抑菌效果更为显著。研究为新型食品包装材料提供新思路，同时实现了绿茶的综合利用。

With polyvinyl alcohol (PVA) as the main raw material, flavonoids were extracted from green tea and were used as antibacterial agents to prepare green tea flavonoid extract/PVA film with good antibacterial properties. The method uses composite enzymatic hydrolysis to extract total flavonoids from green tea, and determines the antioxidant activity and antibacterial ability of total flavonoids in green tea. Mix the green tea extract with PVA in proportion, and use the casting coating method to form a composite preservation film. The results show that the volume ratio of green tea extract to PVA is 4∶6, which is the most suitable and has good mechanical and optical properties. The reducing power of total flavonoids in green tea is positively correlated with absorbance. DPPH radical scavenging ranged from 85% to 90% and OH radical scavenging ranged from 25% to 50%. Green tea extract has significant antibacterial effects on Staphylococcus aureus, Escherichia coli, and Listeria monocytogenes. Green tea/PVA composite film has a more significant inhibitory effect on Staphylococcus aureus with an inhibitory circle diameter of 8.60 mm. The study provides new ideas for new food packaging materials and realizes the comprehensive utilization of green tea.