title: Simultaneous determination of eight major bioactive compounds in Dachengqi Tang (DT) by high-performance liquid chromatography.
abstract: BACKGROUND
  Dachengqi Tang (DT) is a common traditional Chinese medicine formula for expelling neire ('internal heat') in the stomach and intestines. There was no reliable analytical method available for the quality control of DT.
  
  
  METHODS
  A high-performance liquid chromatography (HPLC) method with a reverse phase C18 column (150 x 4.6 mm) was developed. The mobile phase was methanol with 0.2% acetic acid. Eight markers including naringin, hesperidin, aloe emodin, rhein, honokiol, magnolol, emodin and chrysophanol were determined.
  
  
  RESULTS
  Regression analysis revealed a linear relationship between the concentrations of the markers and the peak area ratio of the standards and internal standard. The limit of detection (S/N = 3) and the limit of qualification (RSD < 20%) ranged from 0.21 to 0.43 ng/microl and 0.76 to 1.74 ng/microl respectively. The recovery was between 95.6% and 103.4%. The tests on the samples from three batches of DT showed that the profiles of the markers did not vary significantly among batches.
  
  
  CONCLUSIONS
  A reliable HPLC method for simultaneous determination of the eight markers in DT was developed.
authors.affiliation: Department of Integrative Traditional Chinese and Western Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China. wftang900@hotmail.com
authors.forename: Wenfu
authors.initials: W
authors.lastname: Tang
authors.forename: Meihua
authors.initials: M
authors.lastname: Wan
authors.forename: Zhengyan
authors.initials: Z
authors.lastname: Zhu
authors.forename: Guanyuan
authors.initials: G
authors.lastname: Chen
authors.forename: Xi
authors.initials: X
authors.lastname: Huang