Nguyen Thuong Thi, Tran Pham Bao-Tran, Le Dinh Thien, Thi Dao Bang-Tam, Ha Thuc Chi Nhan
Faculty of Applied Science and Technology, Nguyen Tat Thanh University Ho Chi Minh City Vietnam
Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University Ho Chi Minh City Vietnam.
RSC Adv. 2025 Sep 3;15(38):31620-31631. doi: 10.1039/d5ra05091j. eCollection 2025 Aug 29.
This work aims to construct a nanocomposite coating made from chitosan (CS) and hydrothermally prepared ceria nanoparticles (hCeO NPs), and thoroughly evaluate its influence on extending the lifespan of post-harvest bananas over a 12-day period. The hCeO NPs were characterized to confirm their synthesis before being integrated within the CS matrix. The morphological, structural, mechanical, water-, and UV-barrier properties of nanocomposite coating films were determined. Furthermore, the physicochemical properties of the fresh banana, such as visual attributes, peel color, respiration rate, firmness, weight loss, total soluble solids, titratable acidity, ripening rate, and pH, are thoroughly considered throughout storage. Results showed that the water permeability, solubility, swelling index, fracture resistance, and flexibility are significantly enhanced by adding 1-2% (w/w) hCeO NPs. Notably, a 3.5- and 1.6-fold increase in the fracture strength and plasticity of CS was achieved by adding 1.5% (w/w) hCeO NPs. The great UV-barrier function of the hCeO-loaded CS nanocomposite coating films in UVB and UVC is found. For banana preservation, the CS-1.5%-hCeO nanocomposite coating manifested its superior efficiency in retarding the banana ripening compared to CS, commercial chitosan products, and uncoated fruit, extending the expiration date of fresh bananas without deteriorating the fruit's physicochemical characteristics.
本研究旨在构建一种由壳聚糖（CS）和水热法制备的二氧化铈纳米颗粒（hCeO NPs）制成的纳米复合涂层，并全面评估其在12天内对延长采后香蕉保质期的影响。在将hCeO NPs整合到CS基质中之前，对其进行了表征以确认其合成情况。测定了纳米复合涂层薄膜的形态、结构、力学、防水和紫外线阻隔性能。此外，在整个储存过程中，还充分考虑了新鲜香蕉的物理化学性质，如外观属性、果皮颜色、呼吸速率、硬度、重量损失、总可溶性固形物、可滴定酸度、成熟速率和pH值。结果表明，添加1-2%（w/w）的hCeO NPs可显著提高其透水性、溶解性、溶胀指数、抗断裂性和柔韧性。值得注意的是，添加1.5%（w/w）的hCeO NPs可使CS的断裂强度和可塑性分别提高3.5倍和1.6倍。发现负载hCeO的CS纳米复合涂层薄膜在UVB和UVC中具有很强的紫外线阻隔功能。对于香蕉保鲜，CS-1.5%-hCeO纳米复合涂层在延缓香蕉成熟方面表现出优于CS、商用壳聚糖产品和未涂层水果的效率，延长了新鲜香蕉的保质期，且不影响水果的物理化学特性。
