Abstract: Byc apillarye lectrophoresisw ithi ndirectu ltravioletd etection, sixa minoa cids, namely alanine, serine, valine, leucine, glutamic acid and aspartic acid were detected in Tris (pH=10.50) where benzoic acid was taken as its setting electrolyte. Under the optimum conditions, these six amino acids were well separated within 5 minutes. The relative standard deviation (RSD) of the method was better than 5%. The linear calibration range was 10～1000μmolL and the detection limit were 2.0, 3.5, 4.0, 5.0, 3.5 and 5.0μmol L respectively. Their recoveries were all in the range of 95.73%～104.46%.

Key words: capillary electrophoresis, indirect ultraviolet detection, amino acid, sauce