FI-Chemiluminescence Determination of Caffeic Acid

Based on the enhancement of chemiluminescence (CL) of the reaction system of KMnO4-rhodamine 6G by caffeic acid in an acidic medium,and by using the flow injection technique,a method of FI-CL determination of caffeic acid was proposed.Linear relationship between the magnitude of increase in CL intensity and mass concentration of caffeic acid was obtained in the range of 1.0×10-6-1.0×10-4mol·L-1 with detection limit (3S/N) of 2.4×10-8mol·L-1.The proposed method was used in the analysis of caffeic acid tablets,giving values recovery in the range of 98.0%-104.3% and RSD (n=11) of 3.0%.