Model blends of
turmeric and the adulterants viz, C. zedoaria and C. malabarica
prepared in the proportions 99:1, 95:5, 90:10 and 80:20 (weight
basis) were used as analytical standards. The popular turmeric
cultivars/varieties viz., ‘Alleppey’, ‘Amalapuram’, ‘Prathiba’ and
‘Sudarshana’ collected from the Indian Institute of Spices Research
Experimental Farm also served as analytical standards (reference).