THE SIMULTANEOUS DETERMINATION OF SUDAN I AND SUDAN II BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY IN FOODSTUFFS

Gas chromatography-mass spectrometer equipped with election impact ionization source(GC-EI-MS)was put forward for the determination of Sudan Ⅰ and Sudan Ⅱ in foodstuffs.The faulted mechanisms of the fragment ions and the structures of them of Sudan Ⅰ and Sudan Ⅱ under election impact ionization were parsed.The linear range of the method was 25—800 μg·kg~(-1) and the square correlation coefficients(R~2) was lager than 0.993.The relative standard deviation(RSD) of the method was lower than 12.7%.The recovery values ranged from 77.3% to 106%.The limit of quantifacation(LOQ) was 7.8 μg·kg~(-1) for Sudan Ⅰ and 6.8(μg·kg)~(-1) for Sudan Ⅱ.