Comparative study of drying rosemary leaves, lavender flower and rose petal with solar, tray and vacuum microwave dryers
2009
Poonlarp, P.B. | Apiwongngam, A.
Field level experiments on solar drying of rosemary leaves, lavender flower and rose petal using indirect solar dryer developed by the Department of Food Engineering Agro-Industry Faculty, Chiang-Mai University [Thailand] were studied. Air velocity of 0.5 m/s was forced passing over the samples. Color assessment, moisture content, water activity (a sub w) total ash, tannin and total phenolic compounds were analyzed as the quality parameters. Subsequently, quality parameters from solar dryer, tray dryer, and microwave vacuum rotary drum dryer were compared. Dried product qualities of rosemary leaves, lavender flower and rose petal using solar dryer with moisture content of less than 7% were comparable to those dried in tray dryer and microwave vacuum rotary drum dryer. Electrical energy used by solar dryer, tray dryer and microwave vacuum rotary drum dryer for drying process of rosemary leaves were 6.92, 292.83 and 14.88 Baht/1 kg (fresh), respectively. For lavender, the electrical energy costed 7.53, 232.80 and 16.61 Baht/1 kg (fresh), respectively. Finally, electrical energy used for rose petal drying process were 6.93, 292.83 and 9.09 Baht/1 kg (fresh), respectively.
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