Drying characteristics and quality of red ginseng using far-infrared rays

作者：Ning, Xiaofeng; Lee, Junsoo; Han, Chungsu^*

来源：Journal of Ginseng Research, 2015, 39(4): 371-375.

DOI：10.1016/j.jgr.2015.04.001

• drying characteristics
• drying rate
• far-infrared drying
• red ginseng
• saponin content

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 degrees C, 65 degrees C, and 70 degrees C. The low temperature drying stage was conducted at temperatures of 45 degrees C and 50 degrees C. 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 similar to 50 degrees C. 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.

• 出版日期2015-10
• 单位沈阳农业大学