Abstract
This paper describes initially the application of the Tyndall effect (TE) of metal–organic framework (MOF) materials as a colorimetric signaling strategy for the sensitive detection of pyrophosphate ion (PPi). The used MOF NH2-MIL-101(Fe) was prepared with Fe3+ ions and fluorescent ligands of 2-amino terephthalic acid (NH2-BDC). The fluorescence of NH2-BDC in MOF is quenched due to the ligand-to-metal charge transfer effect, while the NH2-MIL-101(Fe) suspension shows a strong TE. In the presence of PPi analyte, the MOFs will undergo decomposition because of the competitive binding of Fe3+ by PPi over NH2-BDC, resulting in a significant decrease in the TE signal and fluorescence restoration from the released ligands. The results demonstrate that the new method only requires a laser pointer pen (for TE creation) and a smartphone (for portable quantitative readout) to detect PPi in a linear concentration range of 1.25–800 μM, with a detection limit of ~210 nM (3σ) which is ~38 times lower than that obtained from traditional fluorescence with a spectrophotometer (linear concentration range, 50–800 µM; detection limit, 8.15 µM). Moreover, the acceptable recovery of PPi in several real samples (i.e., pond water, black tea, and human serum and urine) ranges from 97.66 to 119.15%.
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Acknowledgements
This work was financially supported by the Central Government-Guided Local Science and Technology Development Project (No. GuikeZY20198006), the Guangxi Scholarship Fund of Guangxi Education Department (No. Guijiaoren-2019-5), the National Natural Science Foundation of China (Nos. 21874032 and 21765007), and the Guangxi Science Fund for Distinguished Young Scholars (No. 2018GXNSFFA281002).
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Huang, X., Yan, Y., Zhang, L. et al. Simple, sensitive, colorimetric detection of pyrophosphate via the analyte-triggered decomposition of metal–organic frameworks regulating their adaptive multi-color Tyndall effect. Anal Bioanal Chem 416, 1821–1832 (2024). https://doi.org/10.1007/s00216-024-05200-4
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DOI: https://doi.org/10.1007/s00216-024-05200-4