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The conversion of zearalenone by various microorganisms was studied. A new polar metabolite was formed in addition to a-and I-zearalenols. The structure of the new metabolite was determined as zearalenone-4-Osulfate conjugate on the basis of enzymatic and acid hydrolysis, followed by mass spectrometry, nuclear magnetic resonance, and infrared spectroscopic analysis. The results obtained demonstrate that Rhizopus arrhizus catalyzes sulfation of zearalenone at the C-4 hydroxyl group.

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A new phenylpropanoid glycoside, crenatoside, as well as the known phenylpropanoid, acteoside, have been isolated from the aerial parts of Orobanche crenata. Their structures have been determined by spectroscopic methods as well as by means of chemical evidence.