Abstract
Natural occurrence of fumonisins B 1 and B 2, incidence of Fusarium species, and capacity to produce fumonisins by Fusarium isolates, were investigated in 50 corn-based samples from Spain destined for animal consumption. Forty-four samples (88%) were found to be contaminated with fumonisins. The levels of contamination were very low, with a mean of 400 ng g in the samples. We investigated the capacity of 11 isolates of Fusarium moniliforme and 19 isolates of F. proliferatum to produce fumonisins. All F. proliferatum isolates and 8 out of the 11 F. moniliforme isolates assayed produced fumonisins on a corn medium. The FB 1 FB 2 ratio in the isolates ranged from 1.1 to 3.5.
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