In-situ grown dual lanthanide metal-organic framework electrospinning nanofiber film for the ratiometric fluorescent sensing of glyphosate in foods

The extensive utilization of glyphosate (Gly) leads to food contamination that poses the potential threat to human health. Therefore, it is urgent need to develop high-sensitivity methods for Gly detection. Herein, a dual-lanthanide metal-organic framework (Ln-MOF) integrating electrospinning nanofiber membrane was fabricated via in-situ growth strategy for the ratiometric fluorescence sensing of Gly. This strategy equips the sensor with a porous structure, which is beneficial for the pre-concentration of low-concentration analytes. The binding of Gly and Tb 3+ weakened the ligand-to-metal energy transfer, leading to the luminescence decrease of Tb-MOF. Meanwhile, the luminescence of Eu-MOF remained unchanged due to the small channel, resulting in a ratiometric response. The sensor exhibited a good linearity in the concentration range of 0.1–20 μM with a detection limit of 32 nM, and achieved satisfactory performances in food detection. Collectively, the proposed sensor may provide a new inspiration and have great potential for practical applications.