Distribution of zearalenone in malted barley fractions dependent on Fusarium graminearum growing conditions

► Fungal growth conditions and zearalenone levels in malted barley germ, flour and bran. ► Incubation at 30 °C and water activity 0.98 generally reduces zearalenone levels. ► Large drop of zearalenone after 34 days, 20 °C, water activity 0.95, in all fractions. ► Prediction of contamination and manipulation of storage conditions to reduce mycotoxin content.