食品包装
果胶
纳米复合材料
接触角
活性包装
食物腐败
纳米技术
化学工程
银纳米粒子
生物相容性
化学
材料科学
纳米颗粒
复合材料
食品科学
生物
工程类
遗传学
细菌
作者
Ying Zhou,Wei-Na Wu,Lixia Wang,Gülden Gökşen,Penghui Shao
标识
DOI:10.1016/j.foodhyd.2022.108331
摘要
Two-dimensional (2D) silver (Ag) nanosheets are ideal fillers to improve the barrier and antimicrobial properties of bio-based nanocomposite films for food packaging due to their high aspect ratio features and superior bactericidal activity. However, the nano-Ag directly added to the matrix is prone to aggregation, which will weaken its effect. In this study, Ag nanosheets were surface non-covalently functionalized with polydopamine (PDA) formed by dopamine oxidative self-polymerization. The PDA modification improved the dispersibility and biocompatibility of the nanosheets in pectin matrixes and immobilized them, delaying their release rate. The potential of the prepared pectin-based nanocomposite film in food packaging was investigated. Results showed that the composite film containing PDA-modified Ag nanosheets ([email protected]) had superior UV resistance and mechanical properties, a more hydrophobic surface with a water contact angle close to 90°. Compared with pure pectin film, the barrier capacity of the film to both water vapor and oxygen was significantly improved. It also exhibited excellent bactericidal efficiency against E. coli and S. aureus. When applied to Agaricus bisporus, the film effectively protected them from UV light, oxygen and microorganisms, thus delaying browning and spoilage, maintaining their texture, color and nutrients, and extended their freshness period up to 6 days.
科研通智能强力驱动
Strongly Powered by AbleSci AI