Pyrazinoquinazoline‐Based Eu‐MOF Ratiometric Fluorescence Sensing: Real‐Time Monitoring of Meat Spoilage Enabled by Dynamic Regulation of LMCT/LLCT Triggered by Biogenic Amines
Abstract
Abstract This study develops a dual‐emission Eu‐MOF ratiometric fluorescence sensor for biogenic amine detection in food spoilage monitoring. The sensor exhibits dual emission at 495 nm (ligand π→π* transition) and 615 nm (ligand‐to‐metal charge transfer, LMCT) through the antenna effect. Biogenic amines specifically regulate the intensity ratio (I 495nm /I 615nm ) by adsorbing into MOF pores via hydrogen bonding, triggering a dynamic equilibrium switch between LMCT and ligand‐to‐ligand charge transfer (LLCT), causing fluorescence color shift from orange to green. Theoretical calculations reveal this response mechanism for the first time. Encapsulating Eu‐MOF in agarose hydrogel‐based portable tags with smartphone RGB analysis enables rapid quantitative detection of biogenic amines (detection limit: 3.7–9.1 µM, response time <10 min). The sensor allows real‐time tracking of spoilage in shrimp and chicken stored at 0–25 °C, with visual fluorescence color transitions reflecting amine accumulation levels. This work provides molecular insights into dynamic charge transfer regulation and establishes a high‐sensitivity, visual, wearable solution for on‐site food safety detection, advancing smart sensing technology in the food industry.
Article Details
Authors (6)
Ao‐Gang Liu
Key laboratory of Material Chemistry for Energy Conversion and Storage Semiconductor chemistry center School of Chemistry and Chemical Engineering Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica Huazhong University of Science and Technology Luoyu road 1037 Wuhan Hubei 430074 People's Republic of China
Yuan Chen
School of Chemical and Biomolecular Engineering
Zi‐Tong Chen
Key laboratory of Material Chemistry for Energy Conversion and Storage Semiconductor chemistry center School of Chemistry and Chemical Engineering Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica Huazhong University of Science and Technology Luoyu road 1037 Wuhan Hubei 430074 People's Republic of China
Xiao‐Huan Liang
Key laboratory of Material Chemistry for Energy Conversion and Storage Semiconductor chemistry center School of Chemistry and Chemical Engineering Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica Huazhong University of Science and Technology Luoyu road 1037 Wuhan Hubei 430074 People's Republic of China
Hui‐Xin Xia
Key laboratory of Material Chemistry for Energy Conversion and Storage Semiconductor chemistry center School of Chemistry and Chemical Engineering Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica Huazhong University of Science and Technology Luoyu road 1037 Wuhan Hubei 430074 People's Republic of China
Bao Li
College of Materials Science and Engineering