The current trends in biodegradable food packaging include the use of materials such as biopolymers which should be free of toxic metals to ensure their quality and use in multiple applications. However, these samples can contain zinc given its presence in the materials used to make them. In this study, a method to determine the concentration of zinc (Zn) in thermoformed and biodegradable flexible films samples based on Cassava and in their raw materials (flour, starch and fique) using flame-atomic absorption spectroscopy is described. Prior, an acid digestion with nitric acid under reflux was required. The method was standardized by means of the evaluation of statistical parameters. The method was sufficiently lineal (R² = 0.999) in a working range from 0.1 to 1.0 mg Zn/L with detection and quantification limits of 0.03 and 0.82 mg/L, respectively. The method was found to be precise and accurate, and could therefore be used to measure Zn content at levels well below safe limits.The precision of the method was evaluated using intermediate precision and repeatability which showed coefficients of variation less than 6.7% and 4.7%, respectively. The percentages of recovery ranged from 96.5% to 98.2%. The method was successfully applied for the determination of Zn in the studied biopolymers samples and the results obtained support the method’s suitability for determining the presence of the metal. Zinc concentrations in thermoformed, flexible films and flour were below 2.36, 2.14 and 2.01 mg/L, respectively, indicating that these polymers could be used for food containers.

可生物降解食品包装的当前趋势包括使用诸如生物聚合物之类的材料，这些材料应不含有毒金属，以确保其质量并在多种应用中使用。但是，考虑到样品中所含的锌元素的存在，这些样品中可能含有锌。在这项研究中，描述了一种使用火焰原子吸收光谱法测定基于木薯的热成型可生物降解的柔性薄膜样品及其原料（面粉，淀粉和烟酒）中锌（Zn）浓度的方法。在此之前，需要在回流下用硝酸进行酸消化。该方法通过评估统计参数进行了标准化。该方法具有足够的线性（R ²Zn = 0.999），工作范围为Zn / L 0.1至1.0 mg，检出限和定量限分别为0.03和0.82 mg / L。结果表明该方法精确，准确，因此可用于测定低于安全限度的锌含量。该方法的精密度是通过中等精度和重复性进行评估的，其变异系数分别小于6.7％和4.7％ ， 分别。回收率从96.5％到98.2％。该方法已成功地用于所研究的生物聚合物样品中锌的测定，所获得的结果证明了该方法适用于测定金属的存在。热成型的柔性薄膜和面粉中的锌浓度分别低于2.36、2.14和2.01 mg / L，