Sun Mengya, Liu Na, Ni Shuzhen, Bian Huiyang, Fu Yingjuan, Chen Xiaoqian
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2019 Oct 4;11(10):1614. doi: 10.3390/polym11101614.
Herein, the chitosan-based (CS) composite film was fabricated via a simple and efficient blending approach by adding poplar hot water extract (HWE), bentonite (BT) and chitosan. The addition of HWE largely improved the UV blocking ability and antioxidant properties of the resultant composite film, and simultaneously a tortuous path was constructed within the chitosan matrix to enhance the water vapor and oxygen barriers after the addition of BT. Specially, the content of HWE at 10 wt % gave a greatly decreased UV light transmittance at 280 nm to the CS-BT-HWE composite film that was 99.36% lower than that of CS-BT film, and the oxidation resistance was 9.65 times higher than that of CS-BT. The mechanical properties and surface morphological observation evaluated by scanning electron microscopy (SEM) and scanning probe microscope (SPM) confirmed the film had a denser structure. The internal chemical structure analyzed using solid state NMR, FTIR and X-ray spectra exhibited the resultant Maillard structure and strong hydrogen bonding that contributed to the improved mechanical properties. Overall, the as-prepared composite film has great potential as food packaging materials, and also provides a high-efficient utilization pathway for HWE.
在此，通过添加杨树热水提取物（HWE）、膨润土（BT）和壳聚糖，采用简单高效的共混方法制备了壳聚糖基（CS）复合膜。HWE的添加大大提高了所得复合膜的紫外线阻隔能力和抗氧化性能，同时在壳聚糖基质中构建了曲折路径，以增强添加BT后的水蒸气和氧气阻隔性能。特别地，当HWE含量为10 wt%时，CS-BT-HWE复合膜在280 nm处的紫外线透过率大幅降低，比CS-BT膜低99.36%，抗氧化性比CS-BT高9.65倍。通过扫描电子显微镜（SEM）和扫描探针显微镜（SPM）评估的机械性能和表面形态观察证实该膜具有更致密的结构。使用固态核磁共振、傅里叶变换红外光谱和X射线光谱分析的内部化学结构显示出所得的美拉德结构和强氢键，这有助于改善机械性能。总体而言，所制备的复合膜作为食品包装材料具有巨大潜力，同时也为HWE提供了一条高效利用途径。
