Aflatoxin in corn: evaluation of filter fluorometer reading of minicolumns.

A minicolumn method using a filter fluorometer was compared with thin layer chromatography for determining aflatoxin in corn. The minicolumn-fluorometer method identified many more samples as aflatoxin-positive than the AOAC CB method. Some corn samples contain a blue-fluorescing substance that interferes with minicolumn chromatography of aflatoxins. Aflatoxin levels measured by the minicolumn-fluorometer method did not correspond to those obtained by the CB method.