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The polarographic behaviour of T-2 toxin and deoxynivalenol has been investigated. It was found that the electrochemical activity of tichothecene toxins is related to the presence of an a,@-unsaturated keto group and consequently the polarographic method was selective for trichothecenes having keto groups. Differential-pulse polarography gave a detection limit for a pure solution of deoxynivalenol of 0.029 pmol 1-1 (8.6 ng ml-l). This technique] coupled with an appropriate extraction procedure] was applied to the determination of deoxynivalenol in Fusarium infected corn. A detection limit of about 50 ng g-l (for 60 g of the original sample) was estimated.

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