Portable Fluorescence Histamine Sensor for Assessing Freshness Utilizing Hydrogel Embedded with Dual-Ligand Europium Metal–Organic Framework

). The synthesized Eu-BOP/BDC-OH was integrated with carrageenan to fabricate a hydrogel composite film for portable detection of histamine, and the changing of color can be utilized for semiquantitative freshness detection. The proposed method provided a reliable and efficient portable strategy for histamine detection in seafood.