The present study revealed that the heat treatment of
fresh turmeric rhizome resulted in good colour value
and high TPC without causing any reduction in curcuminoid
concentrations. Heat treatment at 80 C for
30 min showed maximum colour value and TPC. Hence
it is better to process turmeric rhizome by heat processing
rather than by conventional sun-drying. The overall
results show that heat treatment is a better processing
method for turmeric than conventional sun-drying.