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Optimization of Convective Hot Air Drying of Ganodermalucidum Slices Using Response Surface Methodology

In this study, response surface methodology was applied to optimize the drying conditions of Ganodermalucidum slices during convective hot air drying, by referring to the retention of its active ingredients. The independent variables are drying temperature (40 to 80 o C), velocity of air circulation (0.19 to 1.66 ms -1 ) and slice thickness (0.1 to 0.5 cm) whereas the response variables are ganoderic acid content (GA), water- soluble polysaccharides content (Poly), total drying time (DT) and equilibrium moisture content (EMC). Analysis of variance showed that all independent variables had significant effect on DT and the degradation of GA in the slices. Effect of drying temperature and air velocity were more significant on the retention of Poly than the effect of slice thickness whereas EMC of the slices was only affected by drying temperature. The optimum drying condition to maximize both GA and Poly in the slices at minimum drying time was found at temperature of 62.80 o C, air circulation of 1.66 ms -1 and 0.1 cm of slice thickness. At this optimum condition, the predicted responses for GA, Poly, DT and EMC were 37.043 µg / g DM, 0.414 mg / g DM, 80.11 min., and 3.41% d. b., respectively.