Abstract
Flow control-based paper devices have recently shown great potential for point-of-need analysis, since they allow for the easy operation of multi-step assays by minimizing user operation. In this work, a wax printing method was evaluated as a means to control liquid flow in 3D microfluidic paper-based analytical devices (μPADs). The resulting flow controlbased 3D μPADs were applied to determine paraoxon-ethyl as a typical organophosphate pesticide model system. The analytical procedure is as simple as applying a 200-μL sample solution, resulting in reproducible (relative standard deviation of colorimetric signals from 6 independently fabricated devices, 2.63%) colorimetric signals within 1 h of the assay time with the limit of detection (LOD) reaching 25.0 μg/L. Finally, results obtained for pesticide-spiked water samples analyzed by flow control-based 3D μPADs showed good agreement with those from a conventional HPLC analysis with UV detection.
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Acknowledgments
Q. T. H. gratefully acknowledges a scholarship from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
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Hua, Q.T., Shibata, H., Hiruta, Y. et al. Flow Control-based 3D μPADs for Organophosphate Pesticide Detection. ANAL. SCI. 35, 393–399 (2019). https://doi.org/10.2116/analsci.18P435
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DOI: https://doi.org/10.2116/analsci.18P435