科研之友
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摘要
The wide application of an organophosphate pesticide triazophos raises concern on the environmental pollution and the potential risk to human health. Thus, it is crucial to regularly monitor triazophos residue in the environment and agro-products. Hereinwe described a non-competitive immunoassay for trace detection of triazophos using a direct surface plasmon resonance (SPR) biosensor. Two anti-triazophos monoclonal antibodies (mAbs) were immobilized on the sensor chip and characterized by SPR-based kinetic analysis. The mAb with relatively slowdissociation ratewas used for direct immunosensing of triazophos. The biosensor assay showed a high specificity and a low detection limit of 0.096 ng mL(-1) to triazophos, with the linear detection range of 0.98-8.29 ng mL(-1). Under the optimal condition, the sensor chip could be regenerated for 160 cycles at least. Moreover, the sensitivemethodwas applied to determine triazophos in the spiked environmentalwater and agricultural products, as well as in unknown real-life samples (including Chinese cabbage, cucumber, and apple). Desirable results demonstrated that the newly-developed immunosensor could be used as a rapid, convenient, and reliable tool to regularly monitor triazophos and meet the detection requirement of its maximum residue limits.
