Samples were analyzed using HPLC method with some minor modifications. The test portion, regarding HPLC analysis, was extracted using 200 ml of methanol/water (80ml/20ml). After filtering, the extract was diluted by water before being
filtered through a glass microfiber filter. Aflatest immune-affinity columns (IACs) were used to clean up the samples. Initially, 10 ml of phosphate buffer saline (PBS) passed through the IAC. Then, 75 ml of the filtrate passed through the IAC at a flow rate of ca.1 drop per second. The column was washed with 15 ml water and dried by applying little vacuum. Finally AFT was eluted using methanol through two following steps; 0.5 ml methanol was applied on the column and was
allowed to pass by gravity, 1 ml additional methanol was poured on the column after a minute and eluate was later collected. The eluate was finally diluted by water before being analyzed by HPLC.