Clean-up of maize samples: PuriTox® TC-F120 Fumonisin solid phase extraction (SPE) strong anion exchange columns for clean-up of maize samples were obtained from Trilogy Analytical Laboratory (Washington, MO, USA).pH of filtered extract was adjusted to 5.8–6.0 with HCl 0.1 M. SPE columns were conditioned by passing 5 mL methanol followed by 5 mL methanol:water (75:25, v/v). Extract (20 mL) was passed through the column at a flow rate of 1 drop per second. Column was washed with 5 mL methanol:water (75:25, v/v) followed by 5 mL methanol. FBs were eluted with 10 mL methanol:acetic acid (99:1, v/v). Extract was evaporated at 60 °C under vacuum.