Abstract
Organophosphorus pesticides (OPs) are the most widely used pesticides in agriculture, and OP residues have been broadly reported in food and environmental samples. The aim of this study is to develop a recombinant antibody-based broad-specificity immunoassay for OPs. A phage display library was prepared from a mouse pre-immunized with a generic immunogen of OPs, and a single-chain variable fragment (scFv) antibody was selected. The selected scFv antibody was fused with biotin acceptor domain (BAD) and overexpressed as an inclusion body in Escherichia coli BL21 (DE3). Then, the protein was refolded by stepwise urea gradient dialysis and biotinylated in vitro by E. coli biotin ligase (BirA). Subsequently, the scFv-BAD protein was purified from the biotinylated system with high yield (66.7 mg L−1) and confirmed by SDS-PAGE and Western blot. Based on the biotinylated scFv-BAD, a sensitive and broad-specificity competitive indirect enzyme-linked immunosorbent assay (ciELISA) for detection of OPs was developed. The cross-reactivity (CR) studies demonstrated that the ciELISA described here exhibited the broadest detection spectrum for OPs up to now, and 30 OPs could be determined with 50 % inhibition value (IC50) values ranging from 19.4 to 515.2 ng mL−1. Moreover, the developed ciELISA was used for the recovery study of the spiked samples and showed satisfactory recoveries.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (grant numbers 30972050 and 31271873) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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All animal procedures were performed according to the ethical standards of the institution or practice.
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The authors declare that there are no conflicts of interest.
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Fengchun Zhao and Yuan Tian contributed equally to this work.
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Zhao, F., Tian, Y., Wang, H. et al. Development of a biotinylated broad-specificity single-chain variable fragment antibody and a sensitive immunoassay for detection of organophosphorus pesticides. Anal Bioanal Chem 408, 6423–6430 (2016). https://doi.org/10.1007/s00216-016-9760-0
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DOI: https://doi.org/10.1007/s00216-016-9760-0