A smartphone-assisted 2D Cd-MOF-based mixed-matrix membrane exhibiting visual and on-site quantitative sensing of antibiotics and pesticides for food safety

Food contamination is a current global concern, thus rapid and accurate quantitative detection of contaminants is essential for ensuring food safety. Herein, a MOF-based mixed-matrix membrane (1@PMMA) was fabricated by incorporating a stable 2D luminescent Cd-MOF, {[Cd2(L)2(DMSO)2]& sdot;2DMSO}n (1) (H2L = 5-(4-(pyridin-4-yl) benzamido)benzene-1,3-dioic acid), into a flexible poly(methyl methacrylate) (PMMA) matrix. The resulting 1@PMMA exhibited sensitive, strong anti-interference, recyclable, and visual detection of nitrofurazone (NFZ) and 2,6-dichloro-4-nitroaniline (DCN). Furthermore, a portable smartphone-assisted sensing platform was developed by coupling the luminescent 1@PMMA with a smartphone, to realize visual and on-site quantitative detection of NFZ and DCN in real food samples. This work provides a portable and intelligent sensing platform for the visual and on-site quantitative detection of antibiotic and pesticide residues in food samples, demonstrating significant potential for food safety monitoring and quality control.