Abstract
A radio-frequency (RF) generator applied in drying technology was designed and manufactured for drying Ganoderma lucidum. The drying experiments were conducted by drying method of RF-assisted heat pump in order to inspect the operating parameters of the RF generator and investigate the effects of the input drying parameters on drying rate in the RF-assisted heat pump drying of Ganoderma lucidum. The results have shown that the RF generator achieved the required operating parameters as design such as RF power of 3 kW and operating frequency of 27 MHz. In RF-assisted heat pump drying, increase in RF power and drying air temperature increases the drying rate. Meanwhile, drying air velocity does not significantly affect the drying rate. At RF power of 1.95 kW, the drying time reduces by 9, 17, and 33% in comparison with RF power of 1.3, 0.65, and 0 kW (heat pump drying). At drying air temperature of 50°C, the drying time reduces by 10% and 21% in comparison with drying air temperature of 40 and 45°C. Besides, increasing RF power retains the higher content of polysaccharide in Ganoderma lucidum, and the Ganoderma lucidum samples retain the color better after drying.
Highlights
IntroductionDrying is a common and effective preservation technique that reduces moisture content of material to lower levels required
Polysaccharide is a main bioactive ingredient in Ganoderma lucidum which has been found to be medically active in several therapeutic effects such as antitumor, anti-inflammatory, antiviral, anticancer, and anti-HIV [1]
The results show that heat generation within the whole volume of drying material that supports the heat transfer and moisture diffusion process to take place faster shortens the drying time and the temperature, and moisture distribution within material becomes more uniform
Summary
Drying is a common and effective preservation technique that reduces moisture content of material to lower levels required. The drying process will affect the quality of the product such as nutritional standards, sensory standards, and physical and chemical standards. The drying method and drying parameters should be considered to find a suitable drying method with optimum drying condition to retain a high quality of drying products, especially in food technology, agricultural products, and medicinal products. Ganoderma lucidum is a medicinal product that contains various bioactive ingredients. Polysaccharide is a main bioactive ingredient in Ganoderma lucidum which has been found to be medically active in several therapeutic effects such as antitumor, anti-inflammatory, antiviral, anticancer, and anti-HIV [1]. Polysaccharide and other bioactive ingredients in Ganoderma lucidum are heat sensitive and the high drying temperature tends to cause higher loss of active ingredients in dehydrated Ganoderma lucidum. In drying Ganoderma lucidum, drying method as well as drying parameters should be considered carefully
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