昆明理工大学食品科学与工程学院李辉教授团队在International Journal of Biological Macromolecules发表题目为“Preparation of multi-barrier and multi-functional paper-based materials by chitosan, ethyl cellulose and green walnut husk biorefinery products for sustainable food packaging”研究论文（利用壳聚糖、乙基纤维素和青核桃壳生物精炼产品制备多阻隔、多功能纸基材料用于可持续食品包装）。摘要： 纸质包装材料因其可再生和环保特性而受到越来越多的关注，但其对水、油和气体的阻隔性能较差，限制了其在食品包装行业的应用。在本研究中，我们开发了一种简单的双层涂层方法，使用天然材料，包括壳聚糖 (CS)、乙基纤维素 (EC) 和来自青核桃壳的级联生物精炼产品 (GWHE 和 CNC)，制造出具有防水防油、阻气、抗氧化和抗菌作用的纸基材料。底部的 CS/CNC 防油涂层和顶部的 EC/GWHE 防水涂层被涂在纸张表面。这些涂层的协同作用增强了气体阻隔性，并赋予纸张功能特性。与未涂布纸相比，双层涂布纸的抗拉指数提高了 239.1%，套件评级值更高，为 12/12，Cobb 60 值更低，为 3.21 mg/m2，水蒸气渗透性 (WVP) 降低了 44.0%，空气渗透性 (AP) 降低了 90.7%。此外，这种涂层纸还具有良好的抗氧化和抗菌性能以及良好的生物降解性。这项研究为 GWH 废物的增值提供了新的见解，并提出了一种生产用于食品包装应用的高性能纸基材料的可持续战略。研究结果：3.1. GWHE 的表征Fig. 1. The molecular structures of main compounds in the GWHE.Fig. 2. (A) Antioxidant ability, (B) inhibition zone images of GWHE (100 mg/mL).3.2 CNC 的表征Fig. 3. SEM images of (A) green walnut husk powder and (B) green walnut husk cellulose3.3. 涂布纸表面微形貌与微观结构3.3.1. SEM分析Fig. 4. SEM surface images and cross-section images of (A, E, I) uncoated paper, (B, F, J) CS/CNC-coated paper, (C, G, K) EC/GWHE-coated paper, and (D, H, L) CS/CNC@EC/GWHE-coated paper.3.3.2. FTIR 和 XRD 分析Fig. 5. (A) FTIR spectra, (B) XRD patterns of different paper samples.3.4 涂布纸的机械性能和阻隔性能Fig. 6. (A) Thickness and coating weight, (B) tensile index and elongation at break, (C) pore size distribution, (D) kit rating and oil contact angle, (E) Cobb value and water contact angle, and (F) water vapor permeability and air permeability of different paper samples.3.5. 热稳定性Fig. 7. TGA and DTG curves of (A)-(B) pure coating materials and (C)-(D) different paper samples.3.6. 涂布纸的功能特性3.6.1. 抗氧化性能3.6.2. 抗菌性能Fig. 8. (A) DPPH/ABTS radical scavenging activity, (B) antibacterial efficiencies of S. aureus and E. coli and (C) antibacterial photographic images of different paper samples.3.7. 整体迁移3.8. 生物降解性Fig. 9. (A) Overall migration values of different paper sample in food simulants. (B) digital photos of different paper samples after being buried in the soil for 0, 20, 40, 60 days, and (C) degradation rate of different paper samples.3.9. 应用Fig. 10. (A) Fatty food, (B) high-viscosity foods, and (C) low-viscosity foods put on the surface of uncoated paper and CS/CNC@EC/GWHE-coated paper for 30 min. (D) Water immersing test and oil immersing test for uncoated paper and CS/CNC@EC/GWHE-coated paper straw.原文链接：https://doi.org/10.1016/j.ijbiomac.2024.134557
