Aflatoxin contamination of groundnuts in Sudan.

Groundnut samples, collected soon after harvest, from different districts in the irrigated region (Central Sudan) were free from aflatoxins with the method used. Samples collected from the rainfed region (Western Sudan) showed variable levels of aflatoxin ranging from 100% sample contamination in El Hamdi to only 10% in Casgeal. Damaged pods were highly contaminated with A. flavus and accumulated large amounts of aflatoxins. However, sound intact pods, recorded lower fungal contamination and were almost free of aflatoxins. Groundnut products collected from Khartoum North (Bahri) have higher levels of aflatoxins than those collected from Khartoum and Umdorman. Gray and red roasted pods showed higher amounts of aflatoxins, while the groundnut past was the least contaminated. None of the three varieties of groundnuts tested in this work was completely resistant to aflatoxin production. A temperature of 30 degrees C and 86.3% relative humidy (RH) are the optimum conditions for both A. flavus growth and aflatoxin production in groundnuts.