This research aims to study the drying kinetics of turmeric using a hot air dryer to investigate the effective moisture diffusivity. The drying temperatures of turmeric are 40, 50, 60 and 70 oC. The air velocity is approximately 1 m/s. The results showed that the effective moisture diffusivity of turmeric was between 3.28 ×10-11 to 1.67 × 10-10 m2/s. Color parameters L* (lightness), a* (redness/greenness) and b* (yellowness/blueness) were used to estimate color changes during drying. L*, a* and b* values of dried turmeric decreased as the drying temperature increased. In addition, the curcumin content of fresh turmeric and dried turmeric, which were dried at various temperatures, were analyzed. It was found that affected the reduction of the curcumin content. In this experiment, the curcumin content of dried turmeric is still within the standard of herbal medicine.
Keywords
Turmeric, Drying kinetics, Effective moisture diffusivity, Hot air dryer
THE JOURNAL OF INDUSTRIAL TECHNOLOGY
Published by : Research and Academic Supports Division College of Industrial Technology, King Mongkut’s University of Technology North Bangkok Contributions welcome at : http://j.cit.kmutnb.ac.th/en/
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