Meng Yahui, Cao Yunfeng, Xiong Kaifeng, Ma Li, Zhu Wenyuan, Long Zhu, Dong Cuihua
Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Jinan 250353, China.
Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Membranes (Basel). 2021 Mar 29;11(4):242. doi: 10.3390/membranes11040242.
As an important functional material in food industry, intelligent packaging films can bring great convenience for consumers in the field of food preservation and freshness detection. Herein, we fabricated pH-sensing films employing hydroxypropyl guar (HPG), 1-butyl-3-methylimidazolium chloride (BmimCl), and anthocyanin (Anth). Besides, the effects of adding cellulose nanocrystals (CNC) into the composite films upon the films' structures and physicochemical properties are elucidated. The addition of CNC promoted more compact film structures. Moreover, CNC dramatically improved several properties of the pH-sensing films, including the distinguishability of their color changes, sensitivity to pH, permeability to oxygen and water vapor, solvent resistance, durability, and low-temperature resistance. These results expand the application range of pH-sensing films containing CNC in the fields of food freshness detection and intelligent packaging.
作为食品工业中的一种重要功能材料，智能包装薄膜可为消费者在食品保鲜和新鲜度检测领域带来极大便利。在此，我们制备了采用羟丙基瓜尔胶（HPG）、1-丁基-3-甲基咪唑氯盐（BmimCl）和花青素（Anth）的pH传感薄膜。此外，还阐明了向复合薄膜中添加纤维素纳米晶体（CNC）对薄膜结构和物理化学性质的影响。CNC的添加促进了薄膜结构更加致密。此外，CNC显著改善了pH传感薄膜的多种性能，包括颜色变化的可区分性、对pH的敏感性、对氧气和水蒸气的渗透性、耐溶剂性、耐久性和耐低温性。这些结果拓展了含CNC的pH传感薄膜在食品新鲜度检测和智能包装领域的应用范围。
