Abstract A new antifungal packaging based on low-density polyethylene and lauric acid as an antifungal agent was developed and characterized. Three LDPE/lauric acid films (varying the amount of lauric acid) and an LDPE blank without additive were produced by extrusion. Analysis of the data for antifungal activity assays, thermal characterization, mechanical properties, water vapor permeability, and FT-IR spectra were done in order to evaluate the functionality of the antifungal packaging developed with these films. The results showed that the water vapor permeability and tensile strength were reduced, while the thermal properties of the polymer did not show significant changes in response to the presence of lauric acid. The in vitro study indicates that the LDPE film with the intermediate concentration of lauric acid exhibited a strong antifungal activity against Colletotrichum tamarilloi. Moreover, the in vivo test shows that the packaging LDPE3.5 presented the best results by inhibiting the growth of the fungus for three weeks. The results reveal that lauric acid has effect as an antifungal additive in vitro and in vivo, and does not generate substantial changes in the mechanical properties of the polymer used, which make this material an excellent candidate for the development of active antimicrobial packaging for tree tomato.

中文翻译：

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低密度聚乙烯/月桂酸薄膜对玉米炭疽菌的抗真菌活性

摘要 开发并表征了一种基于低密度聚乙烯和月桂酸作为抗真菌剂的新型抗真菌包装。通过挤出生产三种低密度聚乙烯/月桂酸薄膜（改变月桂酸的量）和不含添加剂的低密度聚乙烯坯料。对抗真菌活性测定、热表征、机械性能、水蒸气渗透性和 FT-IR 光谱的数据进行了分析，以评估用这些薄膜开发的抗真菌包装的功能。结果表明，水蒸气渗透率和拉伸强度降低，而聚合物的热性能没有显示出响应月桂酸存在的显着变化。体外研究表明，具有中等浓度月桂酸的低密度聚乙烯薄膜对玉米炭疽菌表现出很强的抗真菌活性。此外，体内试验表明，包装LDPE3.5通过抑制真菌生长三周而呈现出最好的结果。结果表明，月桂酸在体外和体内均具有抗真菌添加剂的作用，并且不会对所用聚合物的机械性能产生实质性变化，这使得该材料成为开发树番茄活性抗菌包装的绝佳候选材料.