This work sought to formulate, analyze, model, and optimize Arracacha (Arracacha xanthorrhiza) starch-chitosan based biodegradable films to assess their use as food coating. To study these films, prepared through the casting technique, a Box–Behnken design was used with three factors at three levels (starch 3–4%; glycerol 0.75–1.25%; chitosan 1–2%) to determine the individual and interactive effects of these parameters on the mechanical properties (tensile TS, and elongation at break, %E) and barrier properties (water vapor permeability, WVP) of the films. The results were analyzed by using the Pareto analysis of variance (ANOVA). The descriptive response surfaces were obtained and second-order polynomial models were developed for each response evaluated, which showed good fit to the experimental data with high determination coefficient (R² > 0.95), finding relation between the experimental and predicted values. The optimal film formulation, according to the desirability function by Derringer, with the aim of minimizing the SS and WVP values and maximizing the %E values, was obtained with that containing 4% starch, 1.11% glycerol, and 2% chitosan, presenting low stress strain and permeability and high flexibility, conditions favorable for the desired application.

这项工作旨在制定，分析，建模和优化Arracacha（Arracacha xanthorrhiza）基于淀粉-壳聚糖的可生物降解薄膜，以评估其作为食品涂料的用途。为了研究这些通过流延技术制备的薄膜，采用了Box–Behnken设计，并在三个水平上使用了三个因子（淀粉3-4％；甘油0.75-1.25％；壳聚糖1-2％）来确定个体和相互作用的影响。这些参数对薄膜的机械性能（拉伸TS和断裂伸长率％E）和阻隔性能（水蒸气透过率，WVP）的影响。通过使用帕累托方差分析（ANOVA）分析结果。获得了描述性的响应面，并为评估的每个响应建立了二阶多项式模型，这些模型与高确定系数（R ² > 0.95），找到实验值与预测值之间的关系。含有4％淀粉，1.11％甘油和2％壳聚糖的配方中，根据Derringer的期望函数，以最小化SS和WVP值并最大化％E值为最佳薄膜配方。应力应变和磁导率以及高柔韧性，是满足所需应用的条件。