Portable field detection device based on Por-COF-MF for the determination of SO2 in wine

In this study, we designed a fluorescent Por-COF-MF, for selective detection SO 2 in wine. The fluorescence was quenched due to the intramolecular charge transfer (ICT) process blocked by SO 2 . A good linear relationship of fluorescent intensity with SO 2 in the concentration range of 0.01–1 ppm was found. To achieve facile solid-state detection, Por-COF-MF was loaded on polyvinyl alcohol (PVA) to fabricate a uniform fluorescent film Por-COF-MF@PVA. Then a portable device was designed by 3D printing technology. The device exhibited good linearity in the SO 2 concentration range of 0.5–3 ppm, with a detection limit of 0.06 ppm. The relative standard deviation (RSD) was less than 8 % when measuring SO 2 in three different types of wine. Compared to other portable technologies, our 3D-printed fluorescent device allowed for direct detection of SO 2 content in wine, which provided a more effective and economical method for food safety monitoring.