Fungi and selected mycotoxins from pre- and postfermented corn silage
2008
Pereyra, M.L González | Alonso, V.A. | Sager, R. | Morlaco, M.B. | Magnoli, C.E. | Astoreca, A.L. | Rosa, C.A.R. | Chiacchiera, S.M. | Dalcero, A.M. | Cavaglieri, L.R.
To determine fungal genera, Aspergillus and Fusarium species and aflatoxin B₁ (AFB₁), zearalenone (ZEA), deoxynivalenol (DON), fumonisin B₁ (FB₁) contamination from pre- and postfermented corn silage produced in the most important region of Argentina where silage practice is developed. Sampling of corn silos was performed manually through silos in transects at three levels: upper, middle and low sections. AFB₁ and FB₁ were quantified by high-performance liquid chromatography, zearalenone by enzyme-linked immunosorbent assay and DON by gas chromatography. Over 90% of the samples showed counts higher than 1 x 10⁴ CFU g⁻¹. Aspergillus flavus and Fusarium verticillioides were the prevalent species. Some tested samples were contaminated with AFB₁, ZEA, DON and FB₁. This study demonstrates the presence of fungi and AFB₁, ZEA, DON and FB₁ contamination in corn silage in Argentina. This manuscript makes a contribution to the knowledge of mycotoxins in Argentinean silage in particular because the environmental conditions in this country differ from those of most reports. The comparison of pre- and postfermentation silage is also outstanding. Therefore, information on fungi and mycotoxins present in silage - an increasingly popular commodity - is useful to estimate potential risk for animal and human health.
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