ABSTRACT: Objective To compare the effects of hot air drying, infrared drying, microwave drying and low temperature adsorption drying on the quality of Polygonum umbellatum. The drying rates of the four drying methods were compared. The rehydration and appearance of the dried products were tested and evaluated, and the total yellow pour content in the dried products was determined by ultraviolet spectrophotometry.
Result Microwave drying equipment had the fastest speed, and the product had better rehydration, while low temperature adsorption drying had advantages in flavonoid content retention and appearance color.
Key words: microwave drying of tuckahoe cocos; flavonoids; hot air drying; infrared drying; microwave drying; low temperature adsorption drying; ultraviolet spectrophotometry
Poria cocos is the root of Ilex glabrata, a liliaceous plant. Its taste, light, flat nature, return to the liver and intercalated meridians are commonly used Chinese herbs for clearing away heat and detoxification. It has the functions of regulating diarrhea, strengthening spleen and stomach, strengthening muscles and bones, removing dampness, and promoting joints. It is clinically used to treat limb constriction, muscle and bone pain caused by dampness and heat, hypoderma, scabies, syphilis and mercury poisoning. Recent studies have shown that Tufa cocos has anti-cancer, anti-atherosclerosis and treatment of coronary heart disease and other pharmacological effects.
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