Xu Jiyuan, Xia Ruirui, Zheng Lu, Yuan Tongqi, Sun Runcang
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China.
Shandong Longlive Bio-Technology Co. Ltd., Shandong, 251200, China.
Carbohydr Polym. 2019 Nov 15;224:115164. doi: 10.1016/j.carbpol.2019.115164. Epub 2019 Aug 5.
In this work, the properties of the plasticized hemicelluloses/chitosan-based edible films reinforced by cellulose nanofiber (CNF) have been evaluated. Results showed that the tensile strength (TS) of the film increased by 2.3 times with adding 5% CNF. As compared with unplasticized film, the films containing 10-40% plasticizers (glycerol, xylitol, sorbitol) showed slightly higher water vapor permeability, oxygen permeability, transparency, solubility, and lower contact angle. Among the three types of plasticized films, glycerol-plasticized films exhibited the highest tensile strain at break (TB, 7.80-18.53%), while the sorbitol-plasticized films exhibited the highest TS (23.14-48.96 MPa). However, there were no substantial differences in the three types of plasticized films except TS and TB. Overall, the films containing 20-30% glycerol with high TS (31.02-38.56 MPa) and TB (10.07-15.98%) were suitable for food-packaging applications where high mechanical strength and flexibility are required.
在这项工作中，对纤维素纳米纤维（CNF）增强的增塑半纤维素/壳聚糖基可食用薄膜的性能进行了评估。结果表明，添加5%的CNF后，薄膜的拉伸强度（TS）提高了2.3倍。与未增塑的薄膜相比，含有10 - 40%增塑剂（甘油、木糖醇、山梨醇）的薄膜表现出略高的水蒸气透过率、氧气透过率、透明度、溶解度以及更低的接触角。在三种增塑薄膜中，甘油增塑薄膜的断裂伸长率（TB）最高（7.80 - 18.53%），而山梨醇增塑薄膜的TS最高（23.14 - 48.96 MPa）。然而，除TS和TB外，三种增塑薄膜之间没有实质性差异。总体而言，含有20 - 30%甘油且具有高TS（31.02 - 38.56 MPa）和TB（10.07 - 15.98%）的薄膜适用于需要高机械强度和柔韧性的食品包装应用。
