Thin-Layer Drying Characteristics and Quality Evaluation of Air-Dried Ganoderma Tsugae Murrill |
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Authors: | Siew Kian Chin Christina Vimala Supramaniam Poh Guat Cheng |
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Affiliation: | 1. School of Chemical and Environmental Engineering , The University of Nottingham , Malaysia Campus, Semenyih, Selangor Darul Ehsan, Malaysia;2. School of Bioscience, Faculty of Science , The University of Nottingham , Malaysia Campus, Semenyih, Selangor Darul Ehsan, Malaysia;3. Vita Agrotech Sdn. Bhd. , Jalan Laut Membiru , Selangor Darul Ehsan, Malaysia |
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Abstract: | Ganoderma is normally dried to extend its shelf life without using chemical preservative and to concentrate the medicinal value in the fruiting body. Convective hot air drying characteristics of Ganoderma tsugae Murrill were evaluated in hot air circulated oven at different drying temperatures, sizes, and air flow rates. The drying kinetics of Ganoderma tsugae in kidney shape and slices were investigated and compared at different drying conditions. The variation of effective moisture diffusivity values at decreasing moisture contents during drying was determined from the drying data. Four well-known thin-layer drying models were fitted to the experimental data and the Midilli model was found to satisfactory describe the drying characteristics of kidney-shaped Ganoderma tsugae. Ganoderma tsugae dried at 50°C with air velocity of 1.401 ms?1 showed the highest retention of crude ganoderic acid content compared to other drying conditions. |
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Keywords: | Activation energy Drying Effective diffusivity Ganoderic acid Ganoderma tsugae Mathematical modeling |
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