Natural Occurrence of Mycotoxins in Staple Cereals from Ethiopia |
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Authors: | Amare Ayalew Hartmut Fehrmann Johann Lepschy Robert Beck Dawit Abate |
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Institution: | Department of Plant Sciences, Alemaya University, P.O. Box 241, Alemaya, Ethiopia. amareayalew@yahoo.com |
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Abstract: | The occurrence of mycotoxins in barley, sorghum, teff (Eragrostis tef) and wheat from Ethiopia has been studied. Samples were analyzed for aflatoxin B1 (AFB1), ochratoxin A (OTA), deoxynivalenol (DON), nivalenol (NIV) and zearalenone (ZEN) using high performance liquid chromatography
(HPLC) and for fumonisins (FUM) using enzyme linked immunosorbent assay (ELISA). AFB1 and OTA were detected in samples of
all the four crops. AFB1 was detected in 8.8% of the 352 samples analyzed at concentrations ranging from trace to 26 μg kg−1. OTA occurred in 24.3% of 321 samples at a mean concentration of 54.1 μg kg−1 and a maximum of 2106 μg kg−1. DON occurred in barley, sorghum and wheat at 40–2340 μg kg−1 with an overall incidence of 48.8% among the 84 mainly ‘suspect’ samples analyzed; NIV was co-analyzed with DON and was detected
at 40 μg kg−1 in a wheat sample and at 50, 380, and 490 μg kg−1 in three sorghum samples. FUM and ZEN occurred only in sorghum samples with low frequencies at concentrations reaching 2117
and 32 μg kg−1, respectively. The analytical results indicate higher mycotoxin contamination in sorghum, which could be related to the widespread
storage of sorghum grain in underground pits leading to elevated seed moisture contents. This is the first report on the occurrence
of OTA in teff. |
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Keywords: | barely Eragrostis tef mycotoxin natural occurrence sorghum wheat |
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