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Mass spectral analysis of T-2 toxin formed during the growth ofFusarium sporotrichioides (ATCC 24043) in the presence of H2 18 O showed incorporation of up to three18 O atoms per toxin molecule. The carbonyl oxygens of the acetates at C-4 and C-15 and of the isovalerate at C-8 were derived from H2 O. Toxin formed in the presence of18 O molecular oxygen incorporated up to six18 O atoms per toxin molecule. The overall incorporation was 78 and 92% of toxin molecules labeled for H2 18 O and18 O2 labeled samples, respectively. The oxygens of position 1, the 12,13-epoxide, and the hydroxyl groups at C-3, C-4, C-8, and C-15 were all derived from molecular oxygen.

Trichothecene Biosynthesis in Fusarium sporotrichioides : Origin of the Oxygen Atoms of T-2 Toxin