Purity >95%. Fumonisin B2 is a mycotoxin originally isolated from F. moniliforme, a prevalent fungus of corn and other grains. Fumonisins cause food poisoning in livestock and humans following the consumption of Fusarium -infested corn. Fumonisin B2, like fumonisin B1 , structurally resembles sphingosine and, at 1 μM, inhibits sphingosine N-acyltransferase (>90%) in hepatocytes. Fumonisins induce apoptosis via altered sphingolipid metabolism, resulting in hepatotoxicity and nephrotoxicity. It is now known that fumonisins are produced by fungi other than F. moniliforme and occur as contaminants in a wide variety of foods.