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Attempts were made to elucidate the acetyl transformation of novel trichothecene mycotoxins, 3α,7α,15-trihydroxy-12,13-epoxytrichothec-9-en-8-one (deoxynivalenol) and its derivatives, by trichothecene-producing strains ofFusarium nivale, F. roseum , andF. solani . In the peptone-supplemented Czapek-Dox medium,F. roseum converted 3α-acetoxy-7α,15-dihydroxy-12,13-epoxytrichothec-9-en-8-one (3-acetyldeoxynivalenol) to deoxynivalenol. 3-Acetyldeoxynivalenol was also deacetylated by intact mycelia of the three strains in sugar-free Czapek-Dox medium. The growingF. nivale acetylated deoxynivalenol to afford a small amount of 3-acetyldeoxynivalenol. 3α,7α,15-Triacetoxy-12,13-epoxytrichothec-9-en-8-one (deoxynivalenol triacetate) was transformed by the intact mycelium ofF. solani into 7α,15-diacetoxy-3α-hydroxy-12,13-epoxytrichothec-9-en-8-one (7,15-diacetyl-deoxynivalenol), which was then deacetylated to give 7α-acetoxy-3α,15-dihydroxy-12,13-epoxytrichothec-9-en-8-one (7-acetyldeoxynivalenol). It was noted that the ester at C-7 was not hydrolyzed by the fungal mycelium.

Biological Modification of Trichothecene Mycotoxins: Acetylation and Deacetylation of Deoxynivalenols by Fusarium spp