a mixture of 17 beta-oestradiol , oestrone , des , zeranol , zearalenol , zearalenone and zearalanone was analysed using a 5 micron silica column with gradient elution from hexane to hexane : methanol:2-propanol , 40:45:15 ( v/v ) and ultraviolet detection at 280 nm .
C0043465
zeranol
C0043454
zearalenone