Abstract
An immunochromatographic test system was developed for the detection of T-2 toxin (T2T), which is one of priority contaminants of cereals. The detection is based on the competition between T2T in the sample and the T2T-protein conjugate immobilized on the test strip for the binding to the complexes of anti-T2T antibodies with gold nanoparticles serving as the marker. The results of the competition are recorded as the coloration in the test zone of the test strip produced by the marker. The optimum dilution of the sample for the reliable high-sensitivity analysis corresponds to the final methanol concentration equal to 20%. The deceleration of the movement of reactants along the test strip due to the use of additional membranes impregnated with 10% BSA resulted in the decrease in the detection limit of T2T. The test system was examined for the detection of T2T in water-methanol extracts of maize grains. The disappearance of the color in the test zone, which attests to the presence of mycotoxin, was observed for grain samples containing T2T at a concentration of 53 μg/kg or more (the final T2T concentration in the immunochromatorgaphic assay is 3 ng/mL). The video-digital detection limit of T2T is 16 μg/kg (0.9 ng/mL). The duration of the assay is 15 min. The results of the present study suggest that the developed test system is suitable for the control of the maximum allowable T2T content.
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Original Russian Text © A.V. Petrakova, A.E. Urusov, M.V. Voznyak, A.V. Zherdev, B.B. Dzantiev, 2015, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2015, Vol. 51, No. 6, pp. 616–623.
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Petrakova, A.V., Urusov, A.E., Voznyak, M.V. et al. Immunochromatographic test system for the detection of T-2 toxin. Appl Biochem Microbiol 51, 688–694 (2015). https://doi.org/10.1134/S0003683815060113
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DOI: https://doi.org/10.1134/S0003683815060113