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Transformation of zearalenone to zearalenone-sulfate by Aspergillus spp.

In: World Mycotoxin Journal
Authors:
G. Jard Université de Toulouse, INP/ENSAT, LGC, 1, avenue de l'Agrobiopôle, BP 32607, Auzeville-Tolosane, 31326 Castanet-Tolosan, France

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T. Liboz Université de Toulouse, INP/ENSAT, LGC, 1, avenue de l'Agrobiopôle, BP 32607, Auzeville-Tolosane, 31326 Castanet-Tolosan, France

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F. Mathieu Université de Toulouse, INP/ENSAT, LGC, 1, avenue de l'Agrobiopôle, BP 32607, Auzeville-Tolosane, 31326 Castanet-Tolosan, France

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A. Guyonvarc'h EVIALIS, Talhouët, BP 234, 56006 Vannes Cedex, France

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F. André Centre d'Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France

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M. Delaforge Centre d'Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette, France

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A. Lebrihi Université de Toulouse, INP/ENSAT, LGC, 1, avenue de l'Agrobiopôle, BP 32607, Auzeville-Tolosane, 31326 Castanet-Tolosan, France

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The primary goal of this research was to assess the biotransformation of zearalenone (ZEA), an oestrogenic mycotoxin, into ZEA-sulfate by some Aspergillus section Nigri isolates. A. niger isolates were shown to be able to convert ZEA after 72 h of incubation at different ZEA concentrations (5 to 150 µg/ml). The product formula corresponding to ZEA-sulfate was determined by accurate mass measurement. This conjugate was shown to be less oestrogenic than ZEA using a MCF-7 proliferation assay. This study demonstrated that A. niger has the ability to transform ZEA over a broad range of ZEA concentrations (5 to 150 µg/ml) and that sulfonation could lead to a less toxic compound. These results are significant as little is known about the ability of fungi, and especially A. niger, to detoxify ZEA by sulfonation. This study could lead to a way of detoxifying feed naturally contaminated with mycotoxins.

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