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A toxin-free enzyme-linked immunosorbent assay for the analysis of aflatoxins based on a VHH surrogate standard

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Abstract

A toxin-free enzyme-linked immunosorbent assay (ELISA) for aflatoxins was developed using an anti-idiotype nanobody VHH 2–5 as surrogate standard. Anti-idiotype nanobody VHH 2–5 was generated by immunizing an alpaca with anti-aflatoxin monoclonal antibody 1C11. This assay was used to detect aflatoxins in agro-products after a simple extraction with 75 % methanol/H2O. Aflatoxin concentration was calculated by a two-step approach: the concentration of VHH 2–5 was first obtained by a four-parameter logistic regression from the detected absorbance value at 450 nm, and then converted to aflatoxin concentration by a linear equation. The assay exhibits a limit of detection (LOD) of 0.015 ng mL−1, which is better than or comparable with conventional immunoassays. The performance of our VHH surrogate-based ELISA was further validated with a high-performance liquid chromatography (HPLC) method for total aflatoxins determination in 20 naturally contaminated peanut samples, displaying a good correlation (R 2 = 0.988). In conclusion, the proposed assay represents a first example applying an anti-idiotype VHH antibody as a standard surrogate in ELISA. With the advantages of high stability and ease of production, the VHH antibody-based standard surrogate can be extended in the future to immunoassays for other highly toxic compounds.

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Acknowledgement

This work was supported by the Special Fund for Agro-scientific Research in the Public Interest (201203094), the Project of National Science & Technology Pillar Plan (2012BAB19B09), the National Natural Science Foundation of China (31171702, 31501560), and Fundamental Research Funds for the Central Universities (Z109021566).

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Correspondence to Peiwu Li or Qi Zhang.

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Published in the topical collection Immunoanalysis for Environmental Monitoring and Human Health with guest editors Shirley J. Gee, Ivan R. Kennedy, Alice Lee, Hideo Ohkawa, Tippawan Prapamontol, and Ting Xu.

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Wang, Y., Li, P., Zhang, Q. et al. A toxin-free enzyme-linked immunosorbent assay for the analysis of aflatoxins based on a VHH surrogate standard. Anal Bioanal Chem 408, 6019–6026 (2016). https://doi.org/10.1007/s00216-016-9370-x

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  • DOI: https://doi.org/10.1007/s00216-016-9370-x

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