Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, People's Republic of China.
Department of Polymers and Pigments, National Research Centre, Dokki 12622, Cairo, Egypt.
Int J Biol Macromol. 2024 Oct;277(Pt 1):133784. doi: 10.1016/j.ijbiomac.2024.133784. Epub 2024 Jul 31.
In this study, various chitosan-based films such as chitosan (C), chitosan-condensed tannin (CT), chitosan-casein (CC), and chitosan-casein-condensed tannin (CCT) films were prepared for the purpose of food packaging. In order to improve the hydrophobicity of these films, carnauba wax was blended into CCT to produce CCTW film. Properties such as morphology, UV resistance, water solubility, barrier performance, tensile strength, antioxidant, antibacterial and its performance as food packaging were evaluated. Compared with other chitosan-based films, CCTW films exhibited higher UV resistance, tensile strength, thermal stability and hydrophobicity. The addition of both condensed tannin and carnauba wax has significantly decreased the water vapor and oxygen permeability of the CCTW films. The CCTW films were proved capable of repelling most daily consuming liquids. Besides, CCTW films displayed outstanding free radical scavenging rate and antibacterial properties. Meanwhile, bananas wrapped with CCTW films remained fresh for seven days without any mold growth and outperformed other types of films. Apart from that, the CCTW films also showed biodegradable characteristics after exposure to Penicillium sp. These distinguished characteristics made the CCTW films a promising packaging material for long-term food storage.
在这项研究中，制备了各种壳聚糖基薄膜，如壳聚糖（C）、壳聚糖-单宁酸（CT）、壳聚糖-酪蛋白（CC）和壳聚糖-酪蛋白-单宁酸（CCT）薄膜，用于食品包装。为了提高这些薄膜的疏水性，将巴西棕榈蜡混入 CCT 中以制备 CCTW 薄膜。评估了这些薄膜的形态、抗紫外线、水溶性、阻隔性能、拉伸强度、抗氧化、抗菌性能及其作为食品包装的性能。与其他壳聚糖基薄膜相比，CCTW 薄膜表现出更高的抗紫外线、拉伸强度、热稳定性和疏水性。添加单宁酸和巴西棕榈蜡显著降低了 CCTW 薄膜的水蒸气和氧气透过率。CCTW 薄膜能够排斥大多数日常使用的液体。此外，CCTW 薄膜还具有出色的自由基清除率和抗菌性能。同时，用 CCTW 薄膜包裹的香蕉在七天内保持新鲜，没有任何霉菌生长，优于其他类型的薄膜。此外，暴露于青霉菌后，CCTW 薄膜也表现出可生物降解的特性。这些独特的特性使 CCTW 薄膜成为长期食品储存的有前途的包装材料。
