Information Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China; National Engineering Laboratory for Agri-product Quality Traceability, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China; School of Electrical and Information Engineering, Beijing University of Civil Engineering and Architecture, No.15, Yongyuan Road, Daxing District, Beijing 100044, China.
Department of Automation and Information, Tianjin University of Science and Technology, Tianjin 300222, China.
Food Chem. 2022 Aug 1;384:132521. doi: 10.1016/j.foodchem.2022.132521. Epub 2022 Feb 25.
A fluorescence-visualized sensor based on 3-mercaptopropionic acid (MPA)-capped indium phosphide/ zinc sulfide quantum dots (InP/ZnS QDs) and sodium rhodizonate (SR) was designed to sensitively monitor fish freshness. MPA-InP/ZnS QDs, which exhibit orange-red fluorescence, were synthesized by a solvothermal method. In the MPA-InP/ZnS QDs-SR system, the fluorescence of MPA-InP/ZnS QDs was quenched by SR due to the combined function of the inner filter effect (IFE) and static quenching effect (SQE) at pH = 3. When ammonia was added, the fluorescence was recovered, and the color changed from colorless to bright orange-red under UV light (365 nm). The sensing performance for volatile amine gas was studied, and the sensor demonstrated good linearity between the fluorescence intensity, the total volatile basic nitrogen (TVB-N) and the total color change (ΔE) of bighead carp stored at room temperature (25 °C) and refrigerated temperature (4 °C). The proposed sensor has potential applications in monitoring fish freshness.
基于 3-巯基丙酸（MPA）封端的磷化铟/硫化锌量子点（InP/ZnS QDs）和重氮氧基酸钠（SR）的荧光可视化传感器被设计用来灵敏地监测鱼类的新鲜度。MPA-InP/ZnS QDs 具有橙红色荧光，通过溶剂热法合成。在 MPA-InP/ZnS QDs-SR 体系中，由于内滤效应（IFE）和静态猝灭效应（SQE）的共同作用，SR 猝灭了 MPA-InP/ZnS QDs 的荧光，在 pH=3 时。当加入氨时，荧光恢复，颜色在紫外光（365nm）下从无色变为亮橙红色。研究了对挥发性胺气体的传感性能，该传感器在室温（25°C）和冷藏温度（4°C）下储存的大头鱼的荧光强度、总挥发性碱性氮（TVB-N）和总色差（ΔE）之间表现出良好的线性关系。该传感器具有在监测鱼类新鲜度方面的潜在应用。
