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Two physical methods for the decontamination of four cereals contaminated with deoxynivalenol and zearalenone

Trenholm, H.L., Charmley, L.L., Prelusky, D.B., Warner, R.M.
Journal of agricultural and food chemistry 1991 v.39 no.2 pp. 356-360
small grains, feed grains, barley, corn, rye, wheat, deoxynivalenol, zearalenone, decontamination, sieving
Experiments were conducted to examine the efficacy of two physical methods (sieving and dehulling) in reducing the concentrations of deoxynivalenol (DON) and zearalenone (ZEN) in contaminated barley, wheat, corn, and rye. Coarsely ground barley, wheat, and corn containing 5-23 and 0.5-1.21 mg/kg DON and ZEN, respectively, were segregated into fractions of differing particle sizes by sieving through a series of screens. The retained fractions containing the larger particles (+9 mesh barley; +9 mesh wheat; +16 mesh corn) contained 67-83% less toxin than was present in the whole kernel. Removing the hull material from barley prior to sieving resulted in a further 16% reduction in the DON content of the +9 mesh fraction (from a 73% reduction in intact barley to an 89% reduction in dehulled barley). The amount of material lost during the sieving procedure was 34, 55, and 69% of the total material for intact ground barley, wheat, and corn, respectively, and 39% for dehulled and ground barley. When barley, wheat, and rye were treated in a Scott-Strong dehuller (to remove the outer portion of the kernels), 40-100% of the DON and ZEN, 13-19% of the grain material, and 22-32% of the protein was removed from the grain. It was concluded that both sieving and dehulling can represent useful procedures for reducing mycotoxin levels in contaminated grain, under certain circumstances.