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Direct competitive ELISA based on a monoclonal antibody for detection of aflatoxin B1. Stabilization of ELISA kit components and application to grain samples

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Abstract

A direct competitive enzyme-linked immunosorbent assay (ELISA) based on a monoclonal antibody has been developed and optimized for detection of aflatoxin B1 (AFB1), and an ELISA kit has been designed. This immunoassay was highly specific, sensitive, rapid, simple, and suitable for aflatoxin monitoring. AFB1 concentrations determinable by ELISA ranged from 0.1 to 10 μg L−1. The IC50 value was 0.62 μg L−1. Recovery from spiked rice samples averaged between 94 and 113%. The effect of different reagents on the stability of HRP–AFB1 conjugate solution was studied. The performance of a stabilized enzyme tracer in ELISA was determined and compared with that of a freshly prepared control solution of HRP–AFB1 conjugate. The results showed that stabilizing media containing 0.02% BSA, 0.1% Kathon CG, and 0.05 mol L−1 calcium chloride in 0.05 mol L−1 Tris-HCl buffer (pH 7.2) maintained the activity of HRP–AFB1 at a dilution of 1:1000 for a period of at least 12 months at room temperature whereas the reference conjugate solution without the additives lost its activity within a few days. Several additives were tested for their stabilizing effect on a monoclonal antibody (MAb) immobilized on the surface of polystyrene microtitre plates. It was shown that immobilized MAb, treated with post-coating solutions containing PVA, BSA, and combinations of these substances with trehalose, retained its activity for at least 4 months at 4°C, whereas the untreated MAb-coated plate lost its activity within 2 days.

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Acknowledgements

This research was partially supported by the National Toxicology Program of the National Institute of Toxicological Research, Brain Korea 21 Program from the Ministry of Education and the Environmental Biotechnology National Core Research Centre (grant R15-2003-012-01001-0) from KOSEF/MOST, Korea.

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  1. Anna Yu Kolosova

    Present address: Division of Life Science (BK21 Program) and Environmental Biotechnology National Core Research Centre, Graduate School of Gyeongsang National University, 660-701, Chinju, Korea

Authors and Affiliations

  1. Laboratory of Food Analysis, Group of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, 9000, Ghent, Belgium

    Anna Yu Kolosova, Won-Bo Shim, Zheng-You Yang & Duck-Hwa Chung

  2. Division of Chemical Enzymology, Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119992, Moscow, Russia

    Anna Yu Kolosova & Sergei A. Eremin

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  1. Anna Yu Kolosova
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  2. Won-Bo Shim
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Correspondence to Anna Yu Kolosova.

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Kolosova, A.Y., Shim, WB., Yang, ZY. et al. Direct competitive ELISA based on a monoclonal antibody for detection of aflatoxin B1. Stabilization of ELISA kit components and application to grain samples. Anal Bioanal Chem 384, 286–294 (2006). https://doi.org/10.1007/s00216-005-0103-9

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  • DOI: https://doi.org/10.1007/s00216-005-0103-9

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