Yang Wenjing, Zhang Shikai, Li Chenchen, Li Mei, Li Yijing, Wu Peng, Li Houshen, Ai Shiyun
College of Food Science and Engineering, Shandong Agricultural University, Taian 271018, Shandong, PR China.
College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China.
Int J Biol Macromol. 2025 Feb;290:138902. doi: 10.1016/j.ijbiomac.2024.138902. Epub 2024 Dec 18.
Polysaccharide-based films have received increasing attention as promising candidates for petrochemical plastics. However, they are highly brittle, poorly hydrophobic and without antibacterial activity, while current films used to address these issues often struggle to manage the balance between these properties. To achieve a balance of several performance indices of the films, functionalized dialdehyde cellulose nanocrystals (DCNCs) were prepared to activate pectin-based films. Structural characterization including dynamic light scattering techniques (DLS), scanning electron microscope (SEM), atomic force microscope (AFM), attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectrometer and x-ray diffraction (XRD) demonstrated that DCNCs were homogeneously dispersed in the pectin polysaccharide matrix and tightly cross-linked through hydrogen bonding interactions, which promoted the stable formation of high-performance composite films. Compared to pure pectin film, the composite film has better tensile strength (23.09 MPa), water contact angle (WCA, 91.23°), water vapor permeability (WVP, 1.02 × 10 g/cm·s·Pa), and exhibit excellent UV-resistance, DPPH radical scavenging capacity (27.04 %) and antibacterial activity that significantly extended the shelf life of strawberries (5 d). Furthermore, DCNCs can be used to enhance the mechanical strength (4.15-23.46 MPa), WVP (1.55-5.21 × 10 g/cm·s·Pa) and WCA (59.46°-61.03°) of various polysaccharide-based films, which validates their universality. This work effectively improves and balances the several properties of polysaccharide-based films, creating more opportunities for the wide application of polysaccharide-based films, such as food preservation packaging.
基于多糖的薄膜作为石化塑料的有前途的候选材料受到了越来越多的关注。然而，它们非常脆，疏水性差且没有抗菌活性，而目前用于解决这些问题的薄膜往往难以在这些性能之间取得平衡。为了实现薄膜几个性能指标的平衡，制备了功能化二醛纤维素纳米晶体（DCNCs）以活化基于果胶的薄膜。包括动态光散射技术（DLS）、扫描电子显微镜（SEM）、原子力显微镜（AFM）、衰减全反射傅里叶变换红外（ATR-FTIR）光谱仪和X射线衍射（XRD）在内的结构表征表明，DCNCs均匀分散在果胶多糖基质中，并通过氢键相互作用紧密交联，这促进了高性能复合薄膜的稳定形成。与纯果胶薄膜相比，复合薄膜具有更好的拉伸强度（23.09MPa）、水接触角（WCA，91.23°）、水蒸气透过率（WVP，1.02×10g/cm·s·Pa），并表现出优异的抗紫外线性能、DPPH自由基清除能力（27.04%）和抗菌活性，显著延长了草莓的保质期（5天）。此外，DCNCs可用于提高各种基于多糖的薄膜的机械强度（4.15-23.46MPa）、WVP（1.55-5.21×10g/cm·s·Pa）和WCA（59.46°-61.03°），这验证了它们的通用性。这项工作有效地改善并平衡了基于多糖的薄膜的多种性能，为基于多糖的薄膜的广泛应用创造了更多机会，如食品保鲜包装。
