Aflatoxin, a compound with strong biological toxicity, so far the strongest carcinogen produced by Aspergillus flavus and several other molds in moldy grain, such as rice, beans, and peanuts. The main members of it are B1, B2, G1, G2 plus two additional metabolic products, M1 and M2. Aflatoxin is mainly secondary metabolites and commonly occurs in food and feed on damp-hot areas. They exist in the soil, animals and plants, all kinds of nuts, especially can easily contaminate grain and oil products, such as peanut, corn, rice, soybeans, and wheat. Aflatoxin is the most toxic among mycotoxins and a prominent hazard to human health such as tissue bleeding and anorexia.
In 1993, WHO cancer research agency regulated aflatoxin as a category1 carcinogens