Abstract: Capillary electrophoresis(CE) with indirect UVdetection method for theseparation and determination of several organic acids commonly found in foods were developed.Effects of PH, background electrolytes and electroosmotic flow modifiers on separation wereinvestigated. The carrier electrolyte PHplayed an important role in the separation of organicacids. All analytes could be separated in one run by performing CEwith 5. 0 mmol/Lphthalate-3.0 mmol/Ldodecyl trimethyl ammonium chloride (DTAC) at pH=7. 0 within 6 min.The reproducibllity(RSD) of the method is less than 0.17% for migration time and 4. 2% forthe peak area (n=8). Linearity was observed more than one order between 1 and 80 mg/L.The detection limits are obtained from 0. 5 to 5. 0 mg/L. Avariety of matrix samples such aswine, juices and soy sauce were determined by the method. The recoveries were in the rangeof 95 %-102 %.

Key words: Capillary electrophoresis, Indirect UV detection, Organic acid, Food analysis