title: Simultaneous determination of nine marker compounds in the traditional Korean medicine, Dangguisu-san by high-performance liquid chromatography.
abstract: BACKGROUND
  Dangguisu-san (DGSS) has been widely used to treat ecchymosis, blood stagnation and pain resulting from physical shock in Korea.
  
  
  OBJECTIVE
  A high-performance liquid chromatography-photodiode array detection (HPLC-PDA) method for simultaneous analysis of nine components, albiflorin (1), paeoniflorin (2), liquiritin (3), nodakenin (4), coumarin (5), liquiritigenin (6), cinnamic acid (7), cinnamaldehyde (8), and glycyrrhizin (9) in DGSS extract has been developed for the first time.
  
  
  METHODS
  The analytical column for separation of the nine constituents used a Gemini C18 column kept at 40°C by the gradient elution with 1.0% (v/v) acetic acid in water and 1.0% (v/v) acetic acid in acetonitrile as mobile phase. The flow rate was 1.0 mL/min and the injection volume was 10 μL.
  
  
  RESULTS
  Calibration curves of all compounds showed good linearity (r (2) ≥ 0.9999) within the test ranges. The limits of detection and quantification for all analytes were 0.01-0.27 μg/mL and 0.04-0.89 μg/mL, respectively. All recoveries of the nine marker compounds were 96.62-102.47% with relative standard deviations (RSD) <1.72%. The RSDs of intra-day and inter-day precision were <1.32% and 1.61%, respectively. The amounts of the nine marker components ranged from 0.10 mg/g to 13.71 mg/g.
  
  
  CONCLUSIONS
  The developed and validated HPLC-PDA method may help for the quality control of DGSS.
authors.affiliation: Herbal Medicine Formulation Research Group, Herbal Medicine Research Division, Korea Institute, 1672 Yuseongdae-ro, Yuseong-gu, Daejeon, 305-811, Republic of Korea.
authors.forename: Chang-Seob
authors.initials: CS
authors.lastname: Seo
authors.affiliation: Herbal Medicine Formulation Research Group, Herbal Medicine Research Division, Korea Institute, 1672 Yuseongdae-ro, Yuseong-gu, Daejeon, 305-811, Republic of Korea.
authors.forename: Hyeun-Kyoo
authors.initials: HK
authors.lastname: Shin
keywords: Dangguisu-san; high-performance liquid chromatography–photodiode array detection; simultaneous determination; traditional Korean medicine