Abstract: The determination principle of sodium cyclamate in foods-gas chromatography was confirmed and discussed. GC-MS was used to identify resultants in four experiments. The first experiment was the national standard method in which sodium chloride was added to the reaction system after the reaction was over. The second was the national standard method in which sodium chloride was added to the reaction system as reagent. The third was headspace method in which there was not sodium chloride. The fourth was headspace method in which sodium chloride was added to reaction system as reagent. At last, the principle of reaction was concluded by comparison of the four experiments. There was no nitrous acid cyclohexyl ester to generate in the four experiments. When there was not Cl-in the reaction system, the primary resultants were cyclohexene, X and cyclohexenol. When Cl-existed, besides cyclohexene, X and cyclohexenol, there were various chlorocyclohexanes. Author believes that reaction is primary amine diazotization.

Key words: sodium cyclamate, GC-MS, determination principle