Abstract
The fabrication of a magnetically controlled colorimetric aptasensor for chlorpyrifos is reported. The aptasensor was fabricated by the attachment of the colorimetric labels onto the magnetic carrier due to the hybridization reaction between the complementary DNA and aptamer. Chlorpyrifos detection was realized by monitoring the color changes of the TMB/H2O2 solution before and after incubation of the aptasensor with chlorpyrifos via exposure to external magnetic force. The color change was monitored at 650 nm by UV-Vis spectrophotometer. Under the optimal conditions, this magnetically controlled Cu-MOF-based aptasensor showed a detection limit of 4.4 ng/mL with a linear range of 0–1250 ng/mL. The colorimetric aptasensor displayed high selectivity for chlorpyrifos toward other interfering pesticides. The aptasensor was successfully applied for the spiked test of chlorpyrifos in fruits and vegetable samples with good recovery, which were in agreement with data obtained by GC-MS analysis. This magnetically controlled Cu-MOF-based sensing strategy not only leads to development of efficient and facile phase separation, but also expands the MOF’s target scope from H2O2 or glucose to pesticides.
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Funding
This work was sponsored by National Key Research and Development Program of China (2016YFD0400902), China Postdoctoral Science Foundation (2019M650556), Beijing Postdoctoral Research Foundation (2018-ZZ-059), and Postdoctoral Research Foundation of Beijing Academy of Agriculture and Forestry (2018-ZZ-001).
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Liu, Q., He, Z., Wang, H. et al. Magnetically controlled colorimetric aptasensor for chlorpyrifos based on copper-based metal-organic framework nanoparticles with peroxidase mimetic property. Microchim Acta 187, 524 (2020). https://doi.org/10.1007/s00604-020-04499-x
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DOI: https://doi.org/10.1007/s00604-020-04499-x