Zheng Wenhui, Liu Qun, Zeng Xu, Li Meng, Liu Yue, Yang Danmin, Li Xinyi, Weng Wuyin, Zhang Yucang
College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China.
College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China.
Int J Biol Macromol. 2025 Aug;319(Pt 1):145446. doi: 10.1016/j.ijbiomac.2025.145446. Epub 2025 Jun 20.
In this work, the sodium alginate (SA) and bacterial cellulose nanofibers (BCNFs) composite films doped with ZnO nanoparticles (ZnO-NPs) and aqueous phase (AP) from hydrothermal carbonization (ZnO-NPs/AP@SA/BCNFs films) were developed for potential in food packaging films. The composite films were prepared using the casting method. The incorporation of the ZnO-NPs significantly enhanced the tensile strength, thermal stability and water resistance of the composite films, while decreasing the water absorption, water solubility and water vapor transmittance. The T relaxation time of the films also showed that the water degree of freedom increased by adding ZnO-NPs. Moreover, the composite films showed good mechanical properties in a wet state with a tensile strength of 25.09 MPa, exhibited strong antioxidant activity (DPPH radical scavenging rate > 90 %) and satisfactory antibacterial (inhibition zone against E. coli and S. aureus of 17.29 mm and 16.23 mm, respectively). It also proved that AP and ZnO-NPs had a synergistic antibacterial effect. The soil-buried experiment indicated the ZnO-NPs/AP@SA/BCNFs films had good degradability. The strawberry preservation experiment showed that the ZnO-NPs/AP@SA/BCNFs films decelerated the weight loss, decay rate, pH and malondialdehyde change, efficiently keeping the freshness and delaying the shelf life of the strawberries.
在本研究中，制备了掺杂有氧化锌纳米颗粒（ZnO-NPs）和水热碳化水相（AP）的海藻酸钠（SA）与细菌纤维素纳米纤维（BCNFs）复合薄膜（ZnO-NPs/AP@SA/BCNFs薄膜），用于食品包装薄膜的潜在应用。采用流延法制备复合薄膜。ZnO-NPs的加入显著提高了复合薄膜的拉伸强度、热稳定性和耐水性，同时降低了吸水率、水溶性和水蒸气透过率。薄膜的T弛豫时间也表明，添加ZnO-NPs后水的自由度增加。此外，复合薄膜在湿态下表现出良好的力学性能，拉伸强度为25.09MPa，具有较强的抗氧化活性（DPPH自由基清除率>90%）和令人满意的抗菌性能（对大肠杆菌和金黄色葡萄球菌的抑菌圈分别为17.29mm和16.23mm）。这也证明了AP和ZnO-NPs具有协同抗菌作用。土壤掩埋实验表明ZnO-NPs/AP@SA/BCNFs薄膜具有良好的降解性。草莓保鲜实验表明，ZnO-NPs/AP@SA/BCNFs薄膜减缓了草莓的失重、腐烂率、pH值和丙二醛变化，有效保持了草莓的新鲜度并延长了其货架期。
