Abstract: A simple,rapid method for simultaneous determination of four food additives,that is, saccharin, benzoic acid,sorbic acid and caffeine in beverages and foods by RP-HPLC has been described.The separation and determination of those four compounds were based on a SUPELCOSIL LC-8-DB column with UV detection at 230nm and methanol-1.25g/L ammonium oxalate solution (30:70,v:v) as mobile phase.The relationship of the linearity method was proven to be acceptable and the detection limits for those four compounds were 20,8,2,26ng,respectively.The spike recoveries for the determination were in the ranges of 104%～112% and the coefficients of variation below 4.6%(n=5).

Key words: Saccharin Benzoic acid Sorbic acid Caffeine RP-HPLC Beveragess Foods