The physical, thermal, mechanical, optical, microstructural, and barrier properties of low-density polyethylene films (LDPE) containing ferula asafoetida leaf and gum extracts were investigated. Results showed a reduction in elasticity and tensile strength with increasing extract concentration in the polymer matrix. The melting temperature and enthalpy increased with increasing concentration of extracts. The films containing extracts had lower L and a and higher b indices. The films containing leaf extract had more barrier potential to UV than the gum extracts. The oxygen permeability in films containing 5% of leaf and gum extracts increased by 2.3 and 2.1 times, respectively. The morphology of the active films was similar to bubble swollen islands, which was more pronounced at higher concentrations of gum and leaf extracts. FTIR results confirmed some chemical interactions of ferula extracts with the polymer matrix. At the end of day 14th, the growth rate of Aspergillus niger and Saccharomyces cerevisea in the presence of the PE-Gum-5 reduced more than PE-Leaf-5 (3.7 and 2.4 logarithmic cycles, respectively) compared to the first day. Our findings showed that active LDPE films have desire thermo-mechanical and barrier properties for food packaging.

中文翻译：

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用于活性食品包装的携带阿魏提取物的低密度聚乙烯薄膜：热、机械、光学、阻隔和抗真菌特性

研究了含有阿魏叶和树胶提取物的低密度聚乙烯薄膜 (LDPE) 的物理、热、机械、光学、微观结构和阻隔性能。结果表明，随着聚合物基质中提取物浓度的增加，弹性和拉伸强度降低。熔融温度和焓随着提取物浓度的增加而增加。含有提取物的薄膜具有较低的 L 和 a 以及较高的 b 指数。含有叶提取物的薄膜比树胶提取物具有更高的紫外线屏障潜力。含有 5% 的叶子和树胶提取物的薄膜的透氧性分别增加了 2.3 和 2.1 倍。活性薄膜的形态类似于泡胀岛，在较高浓度的树胶和叶提取物下更为明显。FTIR 结果证实了阿魏提取物与聚合物基质的一些化学相互作用。在第 14 天结束时，与第一天相比，在存在 PE-Gum-5 的情况下，黑曲霉和酿酒酵母的生长速度比 PE-Leaf-5 降低的幅度更大（分别为 3.7 和 2.4 个对数周期）。我们的研究结果表明，活性 LDPE 薄膜具有食品包装所需的热机械和阻隔性能。