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.
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Sen et al. (1974) studied this question.
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