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KMID : 0352720150390040371
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Journal of Ginseng Research
2015 Volume.39 No. 4 p.371 ~ p.375
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Drying characteristics and quality of red ginseng using far-infrared rays
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Ning Xiaofeng
Lee Jun-Soo
Han Chung-Su
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Abstract
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Background: The current typical drying methods for red ginseng are sun drying and hot-air drying. The purpose of this study was to investigate drying characteristics of red ginseng by using far-infrared drying. Methods: The far-infrared drying tests on red ginseng were conducted at two drying stages: (1) high temperature for 24 h drying and (2) low temperature drying until the final moisture content was 13±0.5% (wet basis). The high temperature drying stage included three drying chamber temperature conditions of 60℃, 65℃, and 70℃. The low temperature drying stage was conducted at temperatures of 45℃ and50℃. Drying characteristics were analyzed based on factors such as drying rate, color changes, energy consumption, and saponin content. The results were compared with those of the hot-air and sun drying methods. Results: The results revealed that increases in drying temperature caused a decrease in drying time and energy consumption for far-infrared drying. The saponin content decreased under all drying conditions after drying, the highest value (11.34 mg/g) was observed at drying conditions of 60~50℃. The sun drying condition showed the lowest color difference value when compared with far-infrared and hot-air drying. Conclusion: The far-infrared drying showed a faster drying rate, higher saponin content, lower color difference value, and a decrease in energy consumption than seen in hot-air drying.
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KEYWORD
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drying characteristics, drying rate, far-infrared drying, red ginseng, saponin content
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