Abstract：
The novel multifunctional active packaging composite film with antimicrobial, antioxidant, water-vapor and UV-barrier, and corrosion resistance properties was successfully prepared from waste biomass. In this study, waste poplar sawdust was pretreated using green liquor to extract black liquor (BL). BL was then mixed with polyvinyl alcohol (PVA) solution for synthesizing silver nanoparticles (AgNPs). PVA-BL-AgNPs film was fabricated by solution casting method, and the microstructure characterization and macroscopic performance testing of the composite film were conducted. The results revealed that PVA-BL-AgNPs film exhibited inhibitory effects against Staphylococcus aureus (inhibition zone: 33.6 mm), Pseudomonas aeruginosa (inhibition zone: 31.6 mm), and Escherichia coli (inhibition zone: 32.0 mm). It could eliminate over 99 % of 2,2-diazodi (3-ethyl-benzothiazol-6-sulfonic acid) (ABTS) free radicals and provided 100 % UV-blocking, reducing light-induced food damage. It exhibited the improvement of water-vapor barrier properties and corrosion resistance. In vitro cytotoxicity assays demonstrated that no significant impact occurred on cell proliferation, confirming the safety of the film. Packaging experiments showed that PVA-BL-AgNPs film effectively inhibited milk spoilage and prolonged the shelf-life of bread and bananas. Therefore, PVA-BL-AgNPs film might extend the shelf-life of food and offer significant opportunities in addressing the issues of low safety and environmental pollution associated with traditional packaging films.
摘要：
新型多功能抗菌活性包装复合膜,抗氧化剂，水蒸气和紫外线屏障，并成功地从废弃生物质中制备了耐腐蚀性能。在这项研究中,用绿液对白杨锯末进行预处理，提取黑液（BL）。然后将BL与聚乙烯醇(PVA)溶液混合以合成银纳米颗粒(AgNP)。采用溶液流延法制备PVA-BL-AgNPs薄膜,并对复合薄膜进行了微观结构表征和宏观性能测试。结果表明,PVA-BL-AgNPs膜对金黄色葡萄球菌具有抑制作用(抑制区:33.6mm),铜绿假单胞菌（抑菌圈：31.6毫米），和大肠杆菌（抑制区：32.0毫米）。它可以消除超过99％的2,2-重氮（3-乙基-苯并噻唑-6-磺酸）（ABTS）自由基，并提供100％的紫外线阻断，减少光致食物损害。它表现出改善的水蒸气阻隔性能和耐腐蚀性。体外细胞毒性实验表明，对细胞增殖没有显著影响，确认影片的安全性。包装实验表明，PVA-BL-AgNPs膜能有效抑制牛奶腐败，延长面包和香蕉的保质期。因此,PVA-BL-AgNPs薄膜可以延长食品的保质期，并为解决与传统包装薄膜相关的低安全性和环境污染问题提供了重要机会。
