Abstract
Half-bushel parcels of wheat at 15 and 19% moisture content (MC) were implanted in bulks of dry stored oats in a farm granary for 60 weeks to monitor quality changes. Temperature, MC, fat acidity value (FAV), oxygen and carbon dioxide levels, germination, microfloral incidence and abundance, and major storage mycotoxins (aflatoxins, sterigmatocystin, ochratoxin A, citrinin, penicillic acid) were monitored at two-week or four-week intervals during storage. Wheat storage at 19% MC was characterized by higher temperature, MC, FAV, carbon dioxide level, and microfloral abundance, and lower levels of oxygen and germination as compared to 15% MC wheat; no mycotoxins were detected at either moisture. Approximately 19% MC may represent a critical moisture limit for mycotoxin formation in granary stored wheat, given the indigenous mycoflora.
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