Abstract
A competitive bio-barcode immunoassay is described for the trace detection of parathion in water, pear, cabbage, and rice samples. It is based on amplification by platinum nanoparticle acting as a nanozyme. Gold nanoparticles (AuNPs) were modified with (a) monoclonal antibodies (mAbs) against parathion, and (b) thiolated single-stranded DNA (ssDNA) oligonucleotides. Magnetic nanoparticles (MNPs) were functionalized with ovalbumin coupled with parathion hapten. Parathion and its hapten compete with mAbs on the surface of the AuNPs. Subsequently, the platinum nanoparticles (PtNPs) probe, which was functionalized with the complementary thiolated ssDNA (C-ssDNA), was added to the reaction mixture for the detection of parathion. The signal was catalytically amplified by coupling with platinum nanozyme using teramethylbenzidine and H2O2 as the chromogenic system. The immunoassay has a linear range that extends from 0.01–50 μg·L−1, and the limit of detection is 2.0 × 10−3 μg·L−1. The recoveries and relative standard deviations (RSDs) ranged from 91.1–114.4% and 3.6–15.8%, respectively. The method correlates well with data obtained by gas chromatography-tandem mass spectrometry (GC-MS/MS).
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The authors gratefully thank the projects of National Key Research Program of China (2016YFD0401101); National Natural Science Foundation (31671938); The Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Agricultural Sciences (1610072018002).
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Chen, G., Jin, M., Yan, M. et al. Colorimetric bio-barcode immunoassay for parathion based on amplification by using platinum nanoparticles acting as a nanozyme. Microchim Acta 186, 339 (2019). https://doi.org/10.1007/s00604-019-3433-6
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DOI: https://doi.org/10.1007/s00604-019-3433-6