College of Food Science, Southwest University, Chongqing 400715, People's Republic of China.
Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, School of Materials and Energy, Southwest University, Chongqing 400715, People's Republic of China.
Int J Biol Macromol. 2024 Jan;256(Pt 1):128307. doi: 10.1016/j.ijbiomac.2023.128307. Epub 2023 Nov 20.
Films with simultaneously excellent mechanical and anti-fog properties are of great importance for food packaging. A novel strategy is described here to prepare long-lasting anti-fog film with antibacterial and antioxidant capabilities via a simple, green approach. The CMC (carboxymethyl chitosan) gel was integrated with CNF/TA (cellulose nanofibers/tannic acid) composite solution based on layer-by-layer assembly to form a membrane with a bilayer structure. The anti-fog performance of the bilayer film could be adjusted by regulating the CNF/TA layer thickness. On the whole, the developed anti-fog film had high mechanical strength and excellent UV shielding properties, as well as good antibacterial and antioxidant properties, and could be non-fogging for a long time under water vapor (40 °C). The effect of double layer anti-fog film (3%CmFT-3) on the fresh-keeping effect of white Hypsizygus marmoreus was compared at room temperature (28 °C) with commercially available anti-fog PVC film. The results showed that the bilayer anti-fog film could effectively prevent the generation of fog, delay the Browning, inhibit mildew, improve the overall acceptability, and effectively extend the shelf life of white Hypsizygus marmoreus. This biomass-based anti-fog film offers great potential for the development of multifunctional green food packaging.
具有优异机械性能和防雾性能的薄膜对于食品包装非常重要。本文描述了一种通过简单、绿色的方法制备具有抗菌和抗氧化能力的长效防雾膜的新策略。通过层层组装将 CMC（羧甲基壳聚糖）凝胶与 CNF/TA（纤维素纳米纤维/鞣酸）复合溶液集成在一起，形成具有双层结构的膜。通过调节 CNF/TA 层的厚度可以调整双层膜的防雾性能。总的来说，所开发的防雾膜具有较高的机械强度和优异的 UV 屏蔽性能，以及良好的抗菌和抗氧化性能，可以在水蒸气（40°C）下长时间保持无雾。在 28°C 的室温下，将商用防雾 PVC 膜与双防雾膜（3%CmFT-3）对白玉菇的保鲜效果进行了比较。结果表明，双层防雾膜可以有效防止雾的产生，延缓褐变，抑制霉变，提高整体可接受性，并有效延长白玉菇的货架期。这种基于生物质的防雾膜为多功能绿色食品包装的发展提供了巨大的潜力。
