In this work, composite films for food packaging were prepared from chitosan (CS) and polyvinyl alcohol (PVA) incorporated with extracts of edible Solanum nigrum L. (SN) leaves by solvent casting method. The effect of water (SW), ethanol (SE), and methanolic (SM) extracts of SN leaves on the mechanical, physical, barrier, optical, soil degradability, antimicrobial, and antioxidant properties of the films were studied. The composite films have smooth homogeneous surface morphology and showed enhanced UV blocking properties. Incorporation of SN leaves extract greatly enhances the tensile strength. The water vapor transmission rate also improved by the influence of SN extracts. The surface wettability of the composite films significantly (p < 0.005) enhanced. The soil degradability of the film samples was improved by 50%. All the composite films have an overall migration rate within the permitted limit. Besides, the SN leaves incorporated CS/PVA films showed enhanced antibacterial activity towards Staphylococcus aureus and Escherichia coli bacteria and samples did not show significant antifungal activity towards Candida albicans. All SN extracts incorporated samples showed enhanced antioxidant activity by DPPH scavenging assay. These results suggest that all three SN leaves extract induced CS/PVA composite films can be used for food packaging applications.

在这项工作中，从壳聚糖（CS）和聚乙烯醇（PVA）以及可食用龙葵提取物中提取了食品包装用复合膜。L.（SN）通过溶剂浇铸法离开。研究了SN叶的水（SW），乙醇（SE）和甲醇（SM）提取物对薄膜的机械，物理，阻隔，光学，土壤降解性，抗菌和抗氧化性能的影响。复合膜具有光滑均匀的表面形态，并显示出增强的紫外线阻隔性能。SN叶提取物的加入大大提高了抗张强度。SN提取物的影响还提高了水蒸气透过率。复合膜的表面润湿性显着提高（p <0.005）。薄膜样品的土壤可降解性提高了50％。所有复合膜的总迁移率均在允许的范围内。此外，掺有CS / PVA膜的SN叶对细菌的抗菌活性增强。金黄色葡萄球菌和大肠杆菌细菌和样品对白色念珠菌没有显着的抗真菌活性。通过DPPH清除测定，所有掺入SN提取物的样品均显示出增强的抗氧化活性。这些结果表明，所有三种SN叶提取物诱导的CS / PVA复合膜均可用于食品包装应用。