Detection of Curcuma zedoaria and Curcuma aromatica in Curcuma longa(turmeric) by thin-layer chromatography

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Abstract
It is difficult to determine the genuineness or otherwise of powdered turmeric (Curcuma longa) when it is admixed with C. zedoaria or C. aromatica. A simple and rapid thin-layer chromatographic technique is described that involves a three-step colour sequence for the detection of camphor and camphene, the active principles of these adulterants, which are absent in turmeric.