title: [RP-HPLC analysis of single, merging, and boiled together Lonicera japonica and Forsythia suspense].
abstract: OBJECTIVE
  Utilizing RP-HPLC analysis of single, merging and simultaneously boiled Lonicera japonica and Forsythia suspense to find out their identity and difference.
  
  
  METHODS
  Samples were separated by Alltech-C18 column (4. 6 mm x 250 mm, 5 microm) with a mixture solution of acetonitrile-water (containing 0.2% ethanoic acid) as mobile phase, 1.0 mL x min(-1) as flow-rate, 280 nm as detected wave-length, room temperature as temperature of column, 10 microL as injected volume.
  
  
  RESULTS
  The linear ranges of chlorogenic acid and forsythoside A were 0.980-9.800 microg (r = 0.999 9) and 0.972-9. 720 microg (r = 0.999 9), respectively. The average recoveries of chlorogenic acid and forsythoside A were 99.85% (n = 6, RSD 2.0%) and 100.87% (n = 6, RSD 1.6%), respectively. Major peaks were confirmed to the two component herbs, contents of chlorogenic acid and forsythoside A were determinated, ingredients were represented by following peaks were compared qualitatively: peaks k, m, n: L. japonica > merging sample > boiled sample; peaks g, h: Forsythia suspense > merging sample > boiled sample; peaks d, e, i: boiled sample > L. japonica, boiled sample > merging sample.
  
  
  CONCLUSIONS
  Difference and identities among 4 experimental samples of RP-HPLC separations show that Yinqiao, L. japonica and F. suspense' substances are difference and identities, which offered direction for investigating further the topic-pharmacodynamic substance of Yinqiao, provided increasing experimental evidence for clinic medicine and pharmaceutics and supplied reference for the complex prescription of traditional Chinese medicine.
authors.affiliation: Institute of Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Li-Mei
authors.initials: LM
authors.lastname: Lin
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Wang
authors.forename: Wei-Hao
authors.initials: WH
authors.lastname: Wang
authors.forename: Chun
authors.initials: C
authors.lastname: Li
authors.forename: Ling-Li
authors.initials: LL
authors.lastname: Cao
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Zhang
mesh_terms: D002726:Chlorogenic Acid / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004338:Drug Combinations; D031657:Forsythia / Q000737:chemistry*; D006027:Glycosides / Q000032:analysis*; D006358:Hot Temperature; D031239:Lonicera / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry; D015203:Reproducibility of Results
chemical_list: D004338:Drug Combinations; D006027:Glycosides; D002726:Chlorogenic Acid; C058049:forsythiaside