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Occurrence of Aflatoxins, Fumonisin B1, and Zearalenone in Foods and Feeds in Botswana

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Sorghum and maize form the main dietary staple foods in Botswana. Other products such as peanuts, peanut butter, phane (an edible larval stage of an emperor moth Imbrasia belina Westwood), and pulses (cowpeas and beans) are also widely used as food and for the manufacture of feeds. These important food and feed commodities were analyzed for the presence of afiatoxins, fumonisin B1, and zearalenone. Afiatoxins were detected in 40% of the samples analyzed. The concentration of total afiatoxins ranged from 0.1 to 64 μg/kg. The mean concentration ranged from 0.3 μg/kg in sorghum to 23 μg/kg in peanut butter. Peanut butter samples were the most contaminated (71%). No afiatoxins were detected in maize. Fumonisin B1 was detected in 36% of the samples. Maize samples were the most contaminated (85% of the samples) with the concentration ranging from 20 to 1,270 μg/kg. No fumonisin B1 was detected in peanuts, phane, and beans. Zearalenone was only found in 2.6% of the samples analyzed at 40 μg/kg. Afiatoxins were the most common toxins detected in foods and feeds in Botswana. However, fumonisin B1 was more prevalent in maize than afiatoxins or zearalenone.

Document Type: Research Article

Affiliations: Department of Biological Sciences, University of Botswana, Private Bag 0022, Gaborone, Botswana

Publication date: December 1, 1998

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