Peculiarities of sample preparation for the determination of certain mycotoxins in grain products and fruits by immunobiosensor analysis
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Date
2018
Authors
Starodub, Nickolaj
Savchuk, M.
Székács, A.
Marty, J.
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Journal ISSN
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Abstract
Our current report focuses on effective ways of sample preparation for
detection of mycotoxins aflatoxin B1 and T2 in grain products (wheat,
maize, sunflower and oats) as well as patulin in fruits (plum, apple and
grape) by the surface plasmon resonance (SPR) immunobiosensor. An
effective method for carrying out analysis of mycotoxins by an SPR Immunobiosensor was
assessed, and the results obtained were compared with those determined in a traditional
ELISA method. The analysis with the immunobiosensor is capable to be carried out in a
direct format on the basis of mycotoxin-specific antibodies immobilized on the sensor
surface, but its sensitivity was found to be lower than that obtained in a competitive format
on the basis of an immobilized mycotoxin conjugate. Due to this characteristic difference in
analytical sensitivity, we recommend the former format for screening for the presence of
mycotoxins in environmental samples. In turn, the latter format is proposed for verification of
the obtained results of analysis. The competitive analysis by the immunobiosensor has
demonstrated sensitivity in the range of the traditional ELISA method. Organic solvent
extraction of the three mycotoxins, aflatoxin B1, T2 and patulin from produce samples was
carried out with acetonitrile and methanol, and the former solvent was concluded that
preferable. Particular attention was paid to the problem of matrix components detrimentally
affecting extractability and the immunochemical reaction: difficulties due to the presence of small quantities of vegetable oil in grain products needed to be overcome. In cases of samples
of substantial vegetable oil content, acetone as an extraction solvent is recommended, the use
of which did not appear to affect immunoanalysis results. It was demonstrated that the
analysis of patulin in fruits depends on pH of the obtained samples, especially if mycotoxin
content is determined in an unripe stage. In such cases, pH determination and neutralization
by a special buffer prior to immunoanalytical measurements are recommended.
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Keywords
Surface plasmon resonance, immunobiosensor, ELISA, mycotoxins, sample preparation, article
Citation
Peculiarities of sample preparation for the determination of certain mycotoxins in grain products and fruits by immunobiosensor analysis / N. F. Starodub, M. V. Savchuk, A. Székács, J. L. Marty // World Journal of Engineering Research and Technology. - 2018. - Vol. 4, Issue 3. - P. 174-185.