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Compositional Differences of Ojeok-san (Wuji-san) Decoctions Using Pressurized or Non-pressurized Methods for Variable Extraction Times

  • Kim, Jung-Hoon (Basic Herbal Medicine Research Group, Korea Institute of Oriental Medicine) ;
  • Seo, Chang-Seob (Basic Herbal Medicine Research Group, Korea Institute of Oriental Medicine) ;
  • Kim, Seong-Sil (Basic Herbal Medicine Research Group, Korea Institute of Oriental Medicine) ;
  • Shin, Hyeun-Kyoo (Basic Herbal Medicine Research Group, Korea Institute of Oriental Medicine)
  • Received : 2012.04.04
  • Accepted : 2012.06.01
  • Published : 2012.06.30

Abstract

This study compared Ojeok-san (Wuji-san in Chinese) decoctions produced using different extraction methods for variable times. Decoctions were extracted in pressurized or non-pressurized conditions for 60, 120, and 180 mins. We investigated the Ojeok-san extract yield, the total soluble solid content, the hydrogen ion concentration (pH), and the reference compound content. The extract yield and the total soluble solid content were higher in decoctions produced by non-pressurized extraction; both were proportional to the extraction time. The pH tended to decrease as the extraction time was increased in decoctions produced using both methods. After 60 and 180 mins, the levels of albiflorin, paeoniflorin, nodakenin, naringin, and neohesperidin were significantly higher in decoctions extracted using the non-pressurized method compared with those extracted using the pressurized method. After 120 mins, only cinnamaldehyde was extracted in a greater amount in pressurized decoctions compared with non-pressurized decoctions. The levels of paeoniflorin, ferulic acid, nodakenin, naringin, hesperidin, neohesperidin, and glycyrrhizin increased with time in non-pressurized decoctions. This study showed that the use of pressurized and non-pressurized extraction methods for different times affected the composition of Ojeoksan (Wuji-san) decoctions.

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