College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
Department of Chemistry, University of North Texas, Denton, TX, 76201, USA.
Adv Mater. 2021 Apr;33(15):e2008020. doi: 10.1002/adma.202008020. Epub 2021 Mar 10.
Due to increasing food-safety issues, exploiting efficient approaches for food quality assessment and instrumentation has attracted concerns worldwide. Herein, a smart evaluation system based on a fluorescent metal-organic framework (MOF) is developed for real-time visual monitoring of food freshness. Via post-synthetic modification, a ratiometric fluorescent MOF probe is constructed by covalently coupling fluorescein 5-isothiocyanate (5-FITC) with NH -rich lanthanide MOF. The probes exhibit a dual-emissive-responsive to biogenic amine, resulting in an increase in FITC emission along with a decrease in Eu emission accompanied by a clear distinguishable color transition from orange red to green. After doping the probes on a flexible substrate, the obtained MOF composite film can be integrated with a smartphone-based portable platform easily. It is proved that this smart evaluation system can be used for on-site inspection of the freshness of raw fish samples. This work develops a fluorescent MOF-based smart evaluation system as a novel platform for application in food monitoring, which not only has enormous economic value but also holds great public health significance.
由于食品安全问题日益严重，开发有效的食品质量评估和检测方法已引起全球关注。在此，我们开发了一种基于荧光金属有机骨架（MOF）的智能评价系统，用于实时可视化监测食品新鲜度。通过后合成修饰，我们将荧光素 5-异硫氰酸酯（5-FITC）与富含 NH 的镧系 MOF 共价偶联，构建了比率型荧光 MOF 探针。探针对生物胺表现出双发射响应，导致 FITC 发射增加，Eu 发射减少，同时伴有明显的颜色从橙红色到绿色的可区分转变。将探针掺杂在柔性基底上后，得到的 MOF 复合膜可以很容易地与基于智能手机的便携式平台集成。实验证明，该智能评价系统可用于现场检测生鱼样品的新鲜度。本工作开发了一种基于荧光 MOF 的智能评价系统，作为一种应用于食品监测的新型平台，不仅具有巨大的经济价值，而且具有重要的公共卫生意义。
