活性包装
明胶
生物高聚物
花青素
化学工程
纳米颗粒
食品包装
材料科学
化学
纳米复合材料
卡拉胶
傅里叶变换红外光谱
聚合物
纳米技术
复合材料
有机化学
食品科学
工程类
作者
Mahmood Alizadeh Sani,Milad Tavassoli,Shamimeh Azimi Salim,Maryam Azizi‐Lalabadi,David Julian McClements
标识
DOI:10.1016/j.foodhyd.2021.107324
摘要
Sustainable multifunctional halochromic nanocomposite films (“smart films”) were prepared using a casting method. Natural pigments (saffron or red barberry anthocyanins) and TiO2 nanoparticles were included in these films as pH-responsive color indicators and for light blocking, respectively, as well as for their other functional attributes. The film matrix was constructed from a network of crosslinked biopolymers consisting of gelatin and κ-carrageenan. The mechanical, morphological, spectroscopic, colorimetric, thermal, barrier, ammonia-sensitivity, antimicrobial, antioxidant, and biodegradable characteristics of the films were investigated. Moreover, the efficacy of the films was demonstrated by using them to monitor changes in the freshness of packaged fish during storage. Incorporation of TiO2 nanoparticles and natural anthocyanins significantly improved the mechanical and moisture resistance of the films. Spectroscopic analysis (ATR-FTIR and XRD) indicated the nanoparticles and pigments were dispersed throughout the biopolymer matrix, and identified the important molecular interactions involved (such as hydrogen and electrostatic bonding). The films changed color in response to alterations in the freshness of the fish samples, which was correlated to ammonia production during fish degradation. The presence of the anthocyanins and TiO2 nanoparticles increased the bacteriostatic properties of the smart films, as well as inhibiting oxidative reactions. The smart films were shown to be biodegradable, decomposing within ∼30 days under simulated environmental conditions. In conclusion, these biodegradable smart/active films may be suitable replacements for plastic packaging materials. Moreover, they are able to detect food deterioration and prolong shelf life, thereby improving quality and reducing waste.
科研通智能强力驱动
Strongly Powered by AbleSci AI