title: HPLC-ELSD determination of triterpenoids and triterpenoid saponins in Ilex pupurea leaves.
abstract: OBJECTIVE
  To establish an HPLC-ELSD method for the quantification of pedunculoside, ziyuglycoside I and rutundic acid, in the leaves of Ilex purpurea Hassk.
  
  
  METHODS
  By optimizing the chromatographic conditions of HPLC and the parameters of ELSD to study the methodology. Column: Allsphere ODS-2 (250 mm x 4.6 mm ID, 5 microns), mobile phase: methanol-water (59:41), flow rate: 1.0 mL.min-1, drift tube temperature: 59 degrees C, gas flow rate: 2.38 L.min-1.
  
  
  RESULTS
  The calibration curves were linear in the range of 2.56-25.60 micrograms for pedunculoside, 1.64-16.40 micrograms for ziyuglycoside I and 3.74-37.40 micrograms for rutundic acid. The average recovery of pedunculoside was 96.3%, RSD 1.59% (n = 5), ziyuglycoside I 97.3%, RSD 3.82% (n = 5), rutundic acid 97.7%, RSD 2.11% (n = 5). All of RSDs of the precision were less than 4% (n = 6), and the reproduciblities less than 5% (n = 6).
  
  
  CONCLUSIONS
  The method is simple, accurate, effective and feasible. It can be used for the determination of the contents of pedunculoside, ziyuglycoside I and rutundic acid in leaf of Ilex purpurea Hassk.
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004365:Drugs, Chinese Herbal / Q000032:analysis; D005947:Glucose / Q000031:analogs & derivatives* / Q000032:analysis*; D030017:Ilex / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry; D012503:Saponins / Q000032:analysis*; D014315:Triterpenes / Q000032:analysis*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D014315:Triterpenes; C484849:rutundic acid; C484848:ziyuglycoside I; C084241:pedunculoside; D005947:Glucose