Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China; Packing and Packaging Materials Department, National Research Centre, Giza, Egypt.
Packing and Packaging Materials Department, National Research Centre, Giza, Egypt; Advanced Materials and Nanotechnology Lab, Center of Excellence, National Research Centre, Giza, Egypt.
Int J Biol Macromol. 2024 Mar;261(Pt 2):129871. doi: 10.1016/j.ijbiomac.2024.129871. Epub 2024 Feb 2.
The packaging industry demands improved eco-friendly materials with new and enhanced properties. In this context, bio-nanocomposite films with antimicrobial and UV-shielding properties based on modified cellulose nanocrystals/polycaprolactone (MCNC/PCL) were fabricated via solution casting method, and then food packaging simulation was carried out. CNCs were obtained by acid hydrolysis followed by successful functionalization with Quaternary ammonium surfactant, confirmed by FTIR, XPS, XRD, TEM, and DLS analyses. Furthermore, the morphological, physical, antibacterial, and food packaging properties of all prepared films were investigated. Results showed that the mechanical, UV blocking, barrier properties, and antibacterial activity of all composite films were remarkably improved. Particularly, the addition of 3 wt% MCNC increased the tensile strength and elongation at break by 27.5 % and 20.0 %, respectively. Moreover, the permeability of O2, CO2, and water vapor dramatically reduced by 97.6 %, 96.7 %, and 49.8% compared to the Neat PCL. Further, the UV-blocking properties of the composite films were significantly improved. The antimicrobial properties of MCNC/PCL films showed good antimicrobial properties against S. aureus. Finally, cherry packaged with 1 and 3 wt% MCNC films exhibited satisfactory freshness after 22 days of preservation. Overall, the fabricated PCL nanocomposite films can be utilized in the food packaging industry.
包装行业需要改进具有新的和增强性能的环保材料。在此背景下，通过溶液浇铸法制备了具有抗菌和防紫外线性能的基于改性纤维素纳米晶/聚己内酯（MCNC/PCL）的生物纳米复合薄膜，并进行了食品包装模拟。通过酸水解获得 CNC，然后成功地用季铵盐表面活性剂进行功能化，通过 FTIR、XPS、XRD、TEM 和 DLS 分析进行了确认。此外，还研究了所有制备薄膜的形态、物理、抗菌和食品包装性能。结果表明，所有复合薄膜的机械性能、UV 阻隔性能、阻隔性能和抗菌活性都得到了显著提高。特别是，添加 3wt%的 MCNC 使拉伸强度和断裂伸长率分别提高了 27.5%和 20.0%。此外，与纯 PCL 相比，O2、CO2 和水蒸气的渗透率分别降低了 97.6%、96.7%和 49.8%。此外，复合薄膜的 UV 阻隔性能得到了显著提高。MCNC/PCL 薄膜具有良好的抗菌性能，对金黄色葡萄球菌表现出良好的抗菌性能。最后，用 1wt%和 3wt%的 MCNC 薄膜包装的樱桃在 22 天的贮藏期后保持了令人满意的新鲜度。总的来说，所制备的 PCL 纳米复合材料薄膜可用于食品包装工业。
