The objective of this work is to prepare biodegradable films of corn starch, replacing a part of the distilled water used in the formulation of the filmogenic solution with an aqueous extract of Hibiscus sabdariffa L. (HSE) and evaluate its functional properties and antimicrobial capacity. The films are made by casting method, adding different HSE:water volume ratios: 100:0, 75:25, 50:50, 25:75, and 0:100 as control. All films with HSE showed an antimicrobial effect, giving positive results against Listeria monocytogenes, Staphylococcus aureus, Salmonella spp., and Escherichia coli. It is observed that, with the increase in the proportion of HSE, the films are more manageable and glossy than those of starch alone and a more intense red color as the extract content increased, significantly improving its mechanical properties, mainly when the HSE content is above 25% on the filmogenic solution. Likewise, the addition of the extract significantly improved the water vapor barrier capacity of the films. According to the results obtained in this study, corn starch films with aqueous extract of H. sabdariffa are an excellent alternative as a biodegradable packaging material for the food industry, with good functional properties and antimicrobial capacity.

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芙蓉水提取物的玉米淀粉抗菌可降解膜的研制

这项工作的目的是制备玉米淀粉的可生物降解薄膜，用芙蓉（HSE）的水提取物代替成膜溶液配方中使用的一部分蒸馏水，并评估其功能特性和抗菌能力。薄膜通过流延法制备，加入不同的HSE：水体积比：100：0、75：25、50：50、25：75和0：100作为对照。所有带有HSE的薄膜均显示出抗菌作用，对单核细胞增生性李斯特菌，金黄色葡萄球菌，沙门氏菌和大肠埃希氏菌均呈阳性结果。观察到，随着HSE比例的增加，与单独使用淀粉的薄膜相比，这些薄膜更易于处理和具有光泽，随着提取物含量的增加，薄膜呈现出更强烈的红色，从而显着改善了其机械性能，主要是当HSE含量为在成膜溶液上超过25％。同样，添加提取物显着改善了膜的水蒸气阻隔能力。根据这项研究中获得的结果，玉米淀粉膜与糖衣藻的水提取物是食品工业中可生物降解的包装材料的绝佳替代品，具有良好的功能特性和抗菌能力。