Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Effect of hydrothermal processing on ginseng extract

  • Ryu, Jebin (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University) ;
  • Lee, Hun Wook (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University) ;
  • Yoon, Junho (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University) ;
  • Seo, Bumjoon (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University) ;
  • Kwon, Dong Eui (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University) ;
  • Shin, Un-Moo (NextBio Co. Ltd., Institute of Chemical Processes, Seoul National University) ;
  • Choi, Kwang-joon (NextBio Co. Ltd., Institute of Chemical Processes, Seoul National University) ;
  • Lee, Youn-Woo (School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University)
  • Received : 2016.08.05
  • Accepted : 2016.12.05
  • Published : 2017.10.15
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Abstract

Background: Panax ginseng Meyer is cultivated because of its medicinal effects on the immune system, blood pressure, and cancer. Major ginsenosides in fresh ginseng are converted to minor ginsenosides by structural changes such as hydrolysis and dehydration. The transformed ginsenosides are generally more bioavailable and bioactive than the primary ginsenosides. Therefore, in this study, hydrothermal processing was applied to ginseng preparation to increase the yields of the transformed ginsenosides, such as 20(S)-Rg3, Rk1, and Rg5, and enhance antioxidant activities in an effective way. Methods: Ginseng extract was hydrothermally processed using batch reactors at $100-160^{\circ}C$ with differing reaction times. Quantitative analysis of the ginsenoside yields was performed using HPLC, and the antioxidant activity was qualitatively analyzed by evaluating 2,2'-azino-bis radical cation scavenging, 2,2-diphenyl-1-picrylhydrazyl radical scavenging, and phenolic antioxidants. Red ginseng and sun ginseng were prepared by conventional steaming as the control group. Results: Unlike steaming, the hydrothermal process was performed under homogeneous conditions. Chemical reaction, heat transfer, and mass transfer are generally more efficient in homogeneous reactions. Therefore, maximum yields for the hydrothermal process were 2.5-25 times higher than those for steaming, and the antioxidant activities showed 1.6-4-fold increases for the hydrothermal process. Moreover, the reaction time was decreased from 3 h to 15-35 min using hydrothermal processing. Conclusion: Therefore, hydrothermal processing offers significant improvements over the conventional steaming process. In particular, at temperatures over $140^{\circ}C$, high yields of the transformed ginsenosides and increased antioxidant activities were obtained in tens of minutes.

Keywords

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