Effects of varied substrates on aflatoxin production byA. parasiticus

Abstract

Sterilized and nonsterilized wheat kernels, soybean seeds, sesame seeds, peanut and faba bean were infected byA. parasiticus. The chemical composition, aflatoxin content and fatty acid patterns of the seeds were determined. The aflatoxins B1, B2, G1 and G2 were detected, and the amounts of the unsaturated toxins (B1 and G1) were greater than the respective dihydro derivatives (B2 and G2). Sterilized seeds infected by the fungus contained greater amounts of aflatoxins than those infected without previous sterilization. the highest and lowest toxicity indices were recorded for sterilized wheat and soybeans, respectively. Sesame, peanut and soybean exhibited intermediate toxicity indices. The toxicity of the aflatoxins produced was related significantly in every instance to the carbohydrate and lipid:protein ratio, and not to the polyunsaturated fatty acids of the seeds.

Comparative Study of Three Different Methods for the Determination of Aflatoxins in Tahini

“…Tahini (sesame butter) produced by milling of dehulled and roasted sesame seeds is widely consumed as a mixture with sweet foods such as honey and grape molasses and also is an important ingredient of halva, which is a popular sweet food in Turkey and in some Middle East countries ( , ). A. flavus and A. parasiticus have been reported to grow on sesame seed and produce aflatoxins ( − ). Several survey studies on sesame seeds ( − ) and tahini () have shown the extent of aflatoxin contamination.…”

Influence of Some Spice Essential Oils on Aspergillus Parasiticus Growth and Production of Aflatoxins in a Synthetic Medium

“…The amounts of aflatoxins produced are highly dependent upon the chemical composition of the substrate (Farag et al 1986a). Aflatoxins are hepatocarcinogens, mutagens, tetratogens, and toxins.…”

“…AFLATOXINS are metabolites of the molds Aspergiflusj7avus and A.parasiticus which can grow on a wide variety of agricultural commodities and induce undesirable effects (Farag et al, 1981a(Farag et al, , b, 1985aSanchis et al 1986). The amounts of aflatoxins produced are highly dependent upon the chemical composition of the substrate (Farag et al 1986a). Aflatoxins are hepatocarcinogens, mutagens, tetratogens, and toxins.…”