Abstract
Deoxynivalenol (DON) is a mycotoxin that widely distributes in various foods and seriously threatens food safety. To minimize the consumers’ dietary exposure to DON, there is an urgent demand for developing rapid and sensitive detection methods for DON in food. In this study, a bifunctional single-chain variable fragment (scFv) linked alkaline phosphatase (ALP) fusion protein was developed for rapid and sensitive detection of deoxynivalenol (DON). The scFv gene was chemically synthesized and cloned into the expression vector pET25b containing the ALP gene by homologous recombination. The prokaryotic expression, purification, and activity analysis of fusion proteins (scFv-ALP and ALP-scFv) were well characterized and performed. The interactions between scFv and DON were investigated by computer-assisted simulation, which included hydrogen bonds, hydrophobic interactions, and van der Waals forces. The scFv-ALP which showed better bifunctional activity was selected for developing a direct competitive enzyme-linked immunosorbent assay (dc-ELISA) for DON in cereals. The dc-ELISA takes 90 min for one test and exhibits a half inhibitory concentration (IC50) of 11.72 ng/mL, of which the IC50 was 3.08-fold lower than that of the scFv-based dc-ELISA. The developed method showed high selectivity for DON, and good accuracy was obtained from the spike experiments. Furthermore, the detection results of actual cereal samples analyzed by the method correlated well with that determined by high-performance liquid chromatography (R2=0.97165). These results indicated that the scFv-ALP is a promising bifunctional probe for developing the one-step colorimetric immunoassay, providing a new strategy for rapid and sensitive detection of DON in cereals.
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Funding
This work was financially supported by the Hainan Provincial Natural Science Foundation of China (323QN251, 824MS074), the National Natural Science Foundation of China (32102067), and the Education Department of Hainan Province (Hnky2023-74).
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Conceptualization: Xing Liu. Methodology: Li Wen, Yirui Huang. Formal analysis: Li Wen, Yirui Huang, Shiyuan Shi, and Xiaoxia Xie. Investigation: Li Wen, Yirui Huang, Zhichang Sun, and Shiyuan Shi. Validation: Yirui Huang, Xiaoxia Xie. Data curation: Zhenyun He. Project administration: Zhichang Sun, Zhenyun He, and Xing Liu. Writing—original draft preparation: Li Wen. Writing—review and editing: Zhenyun He and Xing Liu. Funding acquisition: Zhenyun He, Xing Liu. Resources: Xing Liu. Supervision: Xing Liu.
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Wen, L., Huang, Y., Sun, Z. et al. Development of alkaline phosphatase-linked single-chain variable fragment fusion proteins for one-step immunodetection of deoxynivalenol in cereals. Anal Bioanal Chem 416, 2929–2939 (2024). https://doi.org/10.1007/s00216-024-05241-9
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DOI: https://doi.org/10.1007/s00216-024-05241-9