Analysis of ochratoxin A in Chinese materia medica herbs by immunoaffinity column-HPLC HPLC analysis of alfatoxins in medicinal herb extracts by immunoaffinity column cleanup and post-column bromination Determining Fumonisins in Corn by High Performance Liquid Chromatography with Immunoaffinity Column Cleanup Simultaneous determination of aflatoxin B1, B2, G1, G2 and ochratoxin A in Glycyrrhiza uralensis by HPLC-FLD after immunoaffinity column with online post-column photochemical derivatization