Chen Feng, Chi Chengdeng
College of Modern Agricultural Engineering, Fujian Vocational College of Agriculture, Fuzhou 350302, China.
College of Life Sciences, Fujian Normal University, Fuzhou 350117, China.
Int J Biol Macromol. 2021 Sep 1;186:405-413. doi: 10.1016/j.ijbiomac.2021.07.025. Epub 2021 Jul 5.
In this study, novel active films based on pullulan and carboxylated cellulose nanocrystal (C-CNC) incorporated with tea polyphenol (TP) was prepared by solution casting method. The effect of TP addition on the microstructural, mechanical, barrier, optical, functional properties of the resultant pullulan/C-CNC/TP (PC-TP) bionanocomposite films was systematically evaluated. Scanning electron microscopy showed that an appropriate TP adding was well distributed within the PC-TP bionanocomposite matrix. Fourier-transform infrared further revealed that new hydrogen bond was formed among the pullulan, C-CNC, TP. Addition of TP at an appropriate level (3%, w/w, on a dry basis of the weight of pullulan and C-CNC) led to stronger intermolecular interactions and more compact microstructure, and thus enhanced the water barrier properties, thermal stability and tensile strength of the resultant bionanocomposite films. Nevertheless, overloading of TP in the bionanocomposite films might produce some aggregations and thus have negative effects on their performance. In addition, the incorporation of TP significantly improved the UV-barrier properties, antioxidant activity and antimicrobial activity of PC-TP bionanocomposite films, while induced a decrease in the transmittance. These results revealed that PC-TP bionanocomposite films with TP at appropriate levels had potential to be used as active food packaging.
在本研究中，通过溶液浇铸法制备了基于普鲁兰多糖和羧化纤维素纳米晶体（C-CNC）并掺入茶多酚（TP）的新型活性薄膜。系统评估了添加TP对所得普鲁兰多糖/C-CNC/TP（PC-TP）生物纳米复合薄膜的微观结构、机械性能、阻隔性能、光学性能和功能特性的影响。扫描电子显微镜显示，适量添加TP能很好地分布在PC-TP生物纳米复合基质中。傅里叶变换红外光谱进一步表明，普鲁兰多糖、C-CNC和TP之间形成了新的氢键。以适当水平（基于普鲁兰多糖和C-CNC重量的干基计为3%，w/w）添加TP会导致更强的分子间相互作用和更致密的微观结构，从而增强所得生物纳米复合薄膜的阻水性能、热稳定性和拉伸强度。然而，生物纳米复合薄膜中TP过量可能会产生一些团聚，从而对其性能产生负面影响。此外，TP的掺入显著提高了PC-TP生物纳米复合薄膜的紫外线阻隔性能、抗氧化活性和抗菌活性，同时导致透光率降低。这些结果表明，含有适量TP的PC-TP生物纳米复合薄膜有潜力用作活性食品包装材料。
