Abstract
The production isolation and purification of a yellow mycotoxin fromPenicillium citreoviride NRRL 2579 in different culture media was described. When injected subcutaneously to albino rats it alters the kinetic pattern of transketolase (EC 2.2.1.1) in liver in vivo in a competitive manner. In vitro, the inhibition is noncompetitive in nature. However, addition of thiamine diphosphate (TPP) to the m vitro system relieved the inhibitory effect. These findings suggested a relationship between citreoviridininduced beriberi and the probable antithiamine effect of the toxin.