Experimental study to determine of drying methods for cantella (Centella asiatica L.)
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leanhduc@hcmuaf.edu.vnKeywords:
Centella, hot air drying, heat pump drying, infrared dryingAbstract
Centella was experimentally dried by four different drying methods including hot air drying, infrared-hot air drying, heat pump drying, infrared-heat pump drying in order to determine a suitable drying a method for Centella. The result has been determined that infrared-heat pump a drying is the best suited for drying Centella. At the drying air velocity 0.5 m/s and drying temperature was 450C, the infrared-heat pump drying method has drying time of 2.5 h, the drying rate of 31.16 %/h, vitamin C content was 309.2 mg%, the index of color change of Centella is 2.48, moisture content of dried Centella is 10.1 %. The predicted equation for moisture content of Centella versus drying time in the drying process was determined: M(t) = 89.2639 – 0.5317×t – 6.0714×10–5×t2; (R2 = 0.997, P < 0.01)
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