Paper-based analytical device coupled with Bi-MOF: Electric field amplification and fluorescence sensing of glyphosate

• Published in: Analytica chimica acta 2023-04, Vol.1248, p.340930-340930, Article 340930
• Main Authors: Wan, Chao-Qun, Pang, Yue-Hong, Yang, Qiu-Yu, Yang, Cheng-Lin, Shen, Xiao-Fang
• Format: Article
• Language: English
• Subjects: Electric field amplification; Fluorescence; Glyphosate; Metal-organic framework; PAD
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2023.340930

Glyphosate, a potent herbicide wildly used in the world, involves potential hazards to human health by accumulating in the food chain. Due to its absence of chromophores and fluorophores, the rapid visual detection of glyphosate has always been difficult. Herein, a paper-based geometric field amplification device visualized by the amino-functionalized bismuth-based metal-organic framework (NH2–Bi-MOF) was constructed for sensitive fluorescence determination of glyphosate. Fluorescence of the synthesized NH2–Bi-MOF was immediately enhanced by interaction with glyphosate. The field amplification of glyphosate was implemented by coordinating the electric field and the electroosmotic flow, which was orchestrated by the geometric configuration of paper channel and the concentration of polyvinyl pyrrolidone, respectively. Under the optimal conditions, the developed method exhibited a linear range of 0.80–200 μmol L−1 with about 12500-fold signal enhancement achieved by just 100 s electric field amplification. It was applied to soil and water with recoveries between 95.7% and 105.6%, holding great prospects in on-site analysis of hazardous anions for environment safety. [Display omitted] •A fluorescent amino-functionalized bismuth-based MOF was prepared.•An electro-field amplification method was constructed for anions.•Simultaneous field amplification and fluorescence determination of glyphosate.•The method was applied to soil and water samples.