sentences:  Methods for detection using TLC are not very sensitive having a limit of detection in the range 20-50 microgrammes/kg.TLC plates must be sprayed with aluminium chloride and heated.Analytical methods for the determination of sterigmatocystin have been reported using HPLC but again these are not very sensitive because of lack of UV absorbance or fluorescence, although a post column reaction with aluminium chloride has been used to increase sensitivity.