Abstract
In recent years, more and more functional peptide ligands have been identified from phage display libraries and served the immunoassay of small molecules. After the identification, the phage particle instead limits further application of peptide ligands, so it is of great significance to explore the peptide ligand as an independent detection reagent. In this work, the identified peptidomimetic of benzothiostrobin was synthesized and labelled with biotin, which was combined with Eu3+-labelled streptavidin to develop the peptide-based time-resolved fluoroimmunoassay (P-TRFIA). Under the optimal conditions, the half-maximum inhibitory concentration (IC50) of proposed P-TRFIA is 3.63 ng mL−1, which is similar to the TRFIA using phage-borne peptidomimetic and Eu3+-labelled anti-phage antibody (IC50: 4.55 ng mL−1), also more sensitive than previously reported immunoassays for benzothiostrobin. In addition, the proposed P-TRFIA shows excellent specificity and accuracy for analysis of spiked samples, and its detection results shows good consistency with high-performance liquid chromatography for the detection of environment and agro-products samples with unknown benzothiostrobin concentrations.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant 31972311), Fundamental Research Funds for the Central Universities (Grant KYQN2022051), and the Science and Technology Innovation Team of Henan Academy of Agricultural Sciences (2022TD20).
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Ding, Y., Chen, H., Zong, L. et al. Biotin-labelled peptidomimetic for competitive time-resolved fluoroimmunoassay of benzothiostrobin. Anal Bioanal Chem 414, 7143–7151 (2022). https://doi.org/10.1007/s00216-022-04288-w
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DOI: https://doi.org/10.1007/s00216-022-04288-w