The six popular branded market samples of turmeric powder
procured from the local market at Calicut, Kerala, India were used in
the study. Genuine turmeric (C. longa L.) and the wild Curcuma spp.
viz., C. zedoaria (Christm.) Rosc. and C. malabarica Vel. et al. rhizomes
used in the study were obtained from the germplasm collection
maintained at the Indian Institute of Spices Research