State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Food Chem. 2025 Jan 15;463(Pt 3):141274. doi: 10.1016/j.foodchem.2024.141274. Epub 2024 Sep 16.
In this study, bio-based composite films from nanocellulose, tannin and chitosan were fabricated. First, tannin was covalently immobilized onto dialdehyde CNCs (DACNCs) through the nucleophilic reaction to obtain TA-CNCs. TA-CNCs were then added into chitosan matrix as the nanofillers to obtain chitosan-TA-CNC (CS-TA-CNC) films. Compared with pure chitosan film, the water solubility, swelling ratio, water vapor and oxygen barrier properties of CS-TA-CNC films decreased, indicating the improved water-resistant and barrier properties. The composite films exhibited high UV blocking, antioxidant capacity and antimicrobial properties against both E. coli and S. aureus. CS-TA-CNC film with a TA-CNC content of 10 % exhibited the highest tensile strength (77.57 MPa) and toughness (23.51 MJ/m), 2.23 and 2.5 times higher than that of pure chitosan film, respectively. The composite films extended postharvest life of tomato cherries compared to the pure chitosan film. Films prepared from sustainable bioresources show promising potential for use in active packaging.
本研究制备了基于纳米纤维素、单宁和壳聚糖的生物基复合膜。首先，通过亲核反应将单宁共价固定到醛基纳米纤维素（DACNCs）上，得到 TA-CNCs。然后将 TA-CNCs 作为纳米填料加入壳聚糖基质中，得到壳聚糖-TA-CNC（CS-TA-CNC）薄膜。与纯壳聚糖薄膜相比，CS-TA-CNC 薄膜的水溶性、溶胀率、水蒸气和氧气阻隔性能降低，表明其耐水性和阻隔性能得到提高。复合薄膜表现出高的紫外线阻断、抗氧化和对大肠杆菌和金黄色葡萄球菌的抗菌性能。TA-CNC 含量为 10%的 CS-TA-CNC 薄膜具有最高的拉伸强度（77.57 MPa）和韧性（23.51 MJ/m），分别比纯壳聚糖薄膜高 2.23 倍和 2.5 倍。与纯壳聚糖薄膜相比，复合薄膜延长了樱桃番茄的采后寿命。由可持续生物资源制备的薄膜在活性包装中具有广阔的应用前景。
