title: Simultaneous determination of seven hydrophilic bioactive compounds in water extract of Polygonum multiflorum using pressurized liquid extraction and short-end injection micellar electrokinetic chromatography.
abstract: BACKGROUND
  Polygoni Multiflori Radix, He-Shou-Wu in Chinese, is a widely used traditional Chinese medicine. Clinically, water decoction is the major application form of He-Shou-Wu. Therefore, simultaneous determination of bioactive compounds in water extract is very important for its quality control.
  
  
  RESULTS
  A pressurized liquid extraction and short-end injection micellar electrokinetic chromatography (MEKC) were first developed for simultaneous determination of seven hydrophilic bioactive compounds in water extract of He-Shou-Wu. The influence of parameters, such as pH, concentration of phosphate, SDS and HP-β-CD, capillary temperature and applied voltage, on the analysis were carefully investigated. Optimum separation was obtained within 14 min by using 50 mM phosphate buffer containing 90 mM SDS and 2% (m/v) HP-β-CD (pH 2.5) at 15 kV and 20°C. All calibration curves showed good linearity (R2>0.9978) within test ranges. The overall LOD and LOQ were lower than 2.0 μg/mL and 5.5 μg/mL, respectively. The RSDs for intra- and inter-day of seven analytes were less than 3.2% and 4.6%, and the recoveries were 97.0%-104.2%.
  
  
  CONCLUSIONS
  The validated method was successfully applied to the analysis of He-Shou-Wu samples, which is helpful for its quality control.
authors: State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China. zhaojing.cpu@163.com.
authors: Ka-Meng
authors: KM
authors: Lao
authors: Dong-Qi
authors: DQ
authors: Han
authors: Xiao-Jia
authors: XJ
authors: Chen
authors: Jing
authors: J
authors: Zhao
authors: Tie-Jie
authors: TJ
authors: Wang
authors: Shao-Ping
authors: SP
authors: Li