Abstract
Ochraxotina A (OTA) is a mycotoxin which has carcinogenic, nephrotoxic, and teratogenic effects, and it is found at different levels and matrices. As consequence, the development of methods capable of reducing this contamination to levels permitted by legislation is encouraged, with emphasis on the enzymatic process that enables the hydrolysis of OTA to a nontoxic metabolite (OTα) under mild reaction conditions. Therefore, the objectives of this work were to optimize the DLLME (dispersive liquid–liquid microextraction) for OTA and OTα determination and to study the kinetic of OTA enzymatic hydrolyses intending its application in the food chain. First, the optimization of the DLLME extraction technique for OTA and OTα was performed, obtaining as an ideal condition the use of 100 μL of 1-octanol (extractor solvent) and 2000 μL of ethyl acetate (dispersant solvent). After the validation, the proposed method was successfully applied during the optimization of OTA biotransformation into OTα. The ideal conditions for OTA hydrolysis were the use of pancreatin (ratio 1 ng OTA:2.7 mg protein) at 50 °C. At these conditions, a kinetic study was conducted and a prediction model for OTA degradation was established based on logarithmic curves. In this study, an innovative method for OTA and OTα detection was developed and with this method, it was possible to study the kinetic of OTA hydrolysis in a fast, reliable, safe, and environmentally friendly manner. Through this kinetic study, the enzymatic hydrolyses developed can be used as a guidance to assure the biotransformation of OTA in different food matrices.
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Acknowledgments
The authors acknowledge the financial support by the Brazilian agencies FAPERGS, CNPq and FINEP. Part of this study was financially supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES)—Finance Code 001.
Funding
Larine Kupski received a postdoctoral fellowship from CNPq (150439/2017–2). Ednei Gilberto Primel received a productivity research fellowship from the Brazilian Agency CNPq (DT 305716/2020-4). Eliana Badiale Furlong received a Scholarship in Research Productivity from the Brazilian Agency CNPq (PQ 307817/2020-2).
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Larine Kupski declares that she has no conflict of interest. Duane Volpato declares that she has no conflict of interest. Caroline B. Rocha declares that she has no conflict of interest. Eliana B. Furlong declares that she has no conflict of interest. Sergiane C. Barbosa declares that she has no conflict of interest. Ednei G. Primel declares that he has no conflict of interest.
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Kupski, L., Volpato, D., Rocha, C.B. et al. Determination of Ochratoxin A and Its Metabolite Ochratoxin Alpha in Different Food Matrices After Enzymatic Biotransformation. Food Anal. Methods 15, 3003–3012 (2022). https://doi.org/10.1007/s12161-022-02349-5
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DOI: https://doi.org/10.1007/s12161-022-02349-5