Cellulose nanofibrils and condensed tannins were chosen to prepare a strong, sustainable packaging material. Cellulose nanofibrils provided the physical and mechanical requirements, while the tannin was incorporated due to its antioxidant properties. Herein, an easy, one-step method was designed to prepare a film containing 190 mg/g of active molecules. The incorporation of tannin into the cellulose matrix was carried out through the mechanical fibrillation of cellulose pulp and tannin mixtures. The tannin-incorporated cellulose films presented high density and improved surface hydrophobicity, which resulted in a 6-fold enhancement in their air-barrier properties. A slow release of antioxidant components was verified upon soaking, as well as good resistance to several solvents. The mechanical features of the cellulose matrix were not significantly affected by the incorporation of such phenolic molecules. These properties are key factors to put forward the utilization of tannin-added films as a valid green, nontoxic packaging material for food and pharmaceutical products.

选择纤维素纳米原纤维和缩合单宁以制备坚固，可持续的包装材料。纤维素纳米纤维提供了物理和机械要求，而单宁因其抗氧化性能而被并入。在本文中，设计了一种简单的一步法来制备包含190 mg / g活性分子的薄膜。通过纤维素纸浆和单宁混合物的机械原纤化将单宁掺入到纤维素基质中。掺有单宁的纤维素膜具有高密度和改善的表面疏水性，从而使其空气阻隔性能提高了6倍。浸泡后证实了抗氧化剂成分的缓慢释放，以及对几种溶剂的良好耐受性。此类酚类分子的掺入不会显着影响纤维素基质的机械特性。这些特性是提出将单宁薄膜用作食品和药品的有效绿色无毒包装材料的关键因素。