A process for decontaminating an agricultural product especially groundnut cake, contaminated with aflatoxin involves treating the contaminated product with water, preferably in the form of steam, until the product is moistened to a level of from 8 to 20%, preferably 12 to 18%, (by wt) of water, treating the moistened product with gaseous ammonia, until the level of ammonia in the mixture is from 1 to 10% (by wt) and the pressure in the reaction vessel is between atmospheric and 40 psi, and retaining the temperature of the mixture between 10 DEG and 150 DEG C until at least 90% (by wt) of the aflatoxin is destroyed. Generally the reaction is performed in an insulated pressure resistant vessel and the heat for the reaction is generated, first, from the steam, and second, from the exothermic reaction between the ammonia and the moistened cake.
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