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We tested a novel colorimetric toxicity test, based on inhibition of β-galactosidase activity in the yeastKluyveromyces marxianus , for sensitivity to a range of mycotoxins. A variety of trichothecene mycotoxins could be detected. The order of toxicity established with this bioassay was verrucarin A &gt; roridin A &gt; T-2 toxin &gt; diacetoxyscirpenol &gt; HT-2 toxin &gt; acetyl T-2 toxin &gt; neosolaniol &gt; fusarenon X &gt; T-2 triol &gt; scirpentriol &gt; nivalenol &gt; deoxynivalenol &gt; T-2 tetraol. The sensitivity of detection was high, with the most potent trichothecene tested, verrucarin A, having a 50% effective concentration (concentration of toxin causing 50% inhibition) of 2 ng/ml. Other mycotoxins (cyclopiazonic acid, fumonisin B1 , ochratoxin A, patulin, sterigmatocystin, tenuazonic acid, and zearalenone) could not be detected at up to 10 μg/ml, nor could aflatoxins B1 and M1 be detected at concentrations up to 25 μg/ml. This test should be useful for trichothecene detection and for studies of relevant interactions—both between trichothecenes themselves and between trichothecenes and other food constituents.

A Colorimetric Technique for Detecting Trichothecenes and Assessing Relative Potencies