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Abstract
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.
ACKNOWLEDGMENT
The authors thank San-Ei Gen F.F.I. Ltd for providing the powdered turmeric pigment sample.