This work aims at the production and characterization of promissory food packaging films based on chitosan (CS), zein (ZN), and poly (vinyl alcohol) (PVA). CS and ZN are biodegradable, biocompatible, and extracting from natural-sources and renewable. Although PVA is a synthetic polymer, it is also considered biocompatible and present water-solubility. From binary and ternary macromolecule mixtures based on CS/ZN/PVA, were obtained films solvent-free. In this facet, extrusion of the macromolecule mixture following by a hot compression to acquire the films' solvent-free. The films were characterized by several techniques such as Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), prioritization query based on critical packaging requirements which underwent visual and sensorial (smell), mechanical properties, scanning electron microscopy (SEM), and barrier property analysis. Our findings showed that a higher proportion of ZN led to yellowish films with lower transparency and/or higher opacity. Therefore, PVA high content is interesting for our proposal since it allows films with translucency, handling, absence of rupture, and odor. The mechanical tests showed that the ZN effect is associated with reduced tensile strength, increasing elongation, and Young's modulus. Thus, ZN's presence, even if in a smaller proportion to PVA, allows the formation of more rigid films. The morphological analysis indicates the formation of compact films and homogeneous surfaces. However, films with higher amounts of CS and ZN presented greater roughness, globular clusters' presence, and heterogeneity (films' cross-section) that may have influenced water vapor permeability values and better barrier property due to tortuosity that decreases as the PVA content is increased. This finding can be associated with the higher crystallinity of the film when the film's formulation presents significant CS and ZN concentrations. Finally, we demonstrate the feasibility of using films based on the mixture of CS, ZN, and PVA as proposals for a food pack.

这项工作旨在生产和表征基于壳聚糖 (CS)、玉米醇溶蛋白 (ZN) 和聚乙烯醇 (PVA) 的食品包装薄膜。CS 和 ZN 是可生物降解的、生物相容的，并且从天然来源中提取并且可再生。尽管 PVA 是一种合成聚合物，但它也被认为具有生物相容性并具有水溶性。从基于 CS/ZN/PVA 的二元和三元大分子混合物获得无溶剂薄膜。在这方面，挤出大分子混合物，然后进行热压缩以获得无溶剂的薄膜。这些薄膜通过多种技术进行表征，例如傅里叶变换红外光谱 (FTIR)、差示扫描量热法 (DSC)、X 射线衍射 (XRD)、基于经过视觉和感官（气味）的关键包装要求的优先级查询、机械性能、扫描电子显微镜 (SEM) 和阻隔性能分析。我们的研究结果表明，较高比例的 ZN 导致黄色薄膜具有较低的透明度和/或较高的不透明度。因此，高含量的 PVA 对我们的提议很有趣，因为它允许薄膜具有半透明性、处理性、无破裂和气味。机械测试表明，ZN 效应与降低的抗拉强度、增加的伸长率和杨氏模量有关。因此，即使 ZN 与 PVA 的比例较小，ZN 的存在也允许形成更坚硬的薄膜。形态分析表明形成了致密的薄膜和均匀的表面。然而，CS 和 ZN 含量较高的薄膜表现出更大的粗糙度、球状团簇的存在和不均匀性（薄膜的 横截面）可能会影响水蒸气渗透率值和更好的阻隔性能，因为随着 PVA 含量的增加，弯曲度会降低。当薄膜的配方表现出显着的 CS 和 ZN 浓度时，这一发现可能与薄膜的较高结晶度有关。最后，我们证明了使用基于 CS、ZN 和 PVA 混合物的薄膜作为食品包装建议的可行性。