EVALUATION OF THE TURMERIC (CURCUMA LONGA L.) BASED ON THE FLOW-INJECTION ANALYSIS WITH ULTRAVIOLET AND FLUOROMETRIC DETECTIONS

A new method for the evaluation of the turmeric food colorants (Curcuma longa L.) of the powdered yellow pigments, based on the flow-injection analysis system with on-line ultraviolet detection (UV) and fluorometric detection (FL), is described. The limits of detection were calculated according to IUPAC that UV was 30.0 ng/ml and FL was 2.0 ng/ml. The linearities of the calibration graphs for curcumin had correlation coefficients exceeding 0.999. Proposed method thus could be useful for a routine determination of curcuminoids at a roughly estimation using curcumin standard. The aim of this study is to establish the simple and accurate method for the determination of the turmeric food colorants.