title: High-performance capillary electrophoresis for determining the contents of berberine, jatrorrhizine and palmatine in Gegenqinlian decoction.
abstract: OBJECTIVE
  To develop a method for alkaloid isolation from the extract of Gegenqinlian decoction (a traditional Chinese herbal preparation) and content determination.
  
  
  METHODS
  After the preparation of the Gegenqinlian decoction extract and the micropellets, the quaternary alkaloids of Coptis chinensis were isolated by high-performance capillary electrophoresis (HPCE) in a buffer solution containing 60% sodium phosphate (60 mmol/L, pH 8.0) and 40% methanol. 2-(4-hydroxyphenyl) ethylammonium chloride was used as the internal standard and the ultraviolet detection was performed at 254 nm for determining the contents of berberine, jatrorrhizine and palmatine in the extract of Gegenqinlian decoction.
  
  
  RESULTS
  Berberine, jatrorrhizine and palmatine were successfully isolated within 6 min with recovery rates of 99.05%, 98.70% and 97.76% respectively and relative standard deviation of 2.12%, 1.85% and 1.95% respectively.
  
  
  CONCLUSIONS
  HPCE is applicable for the determination and isolation of quaternary alkaloids in Coptis chinensis with high accuracy and recovery rate.
authors.affiliation: Key Laboratory of New Drug Development in Traditional Chinese Medicine, First Military Medical University, Guangzhou 510515, China.
authors.forename: Kai-jin
authors.initials: KJ
authors.lastname: Dai
authors.forename: Qi-zhi
authors.initials: QZ
authors.lastname: Luo
authors.forename: Jia-bo
authors.initials: JB
authors.lastname: Luo
authors.forename: An-de
authors.initials: AD
authors.lastname: Ma
mesh_terms: D001599:Berberine / Q000031:analogs & derivatives* / Q000032:analysis*; D001600:Berberine Alkaloids / Q000032:analysis*; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D019075:Electrophoresis, Capillary; D008516:Medicine, Chinese Traditional
chemical_list: D001600:Berberine Alkaloids; D004365:Drugs, Chinese Herbal; C055785:jatrorrhizine; D001599:Berberine; C005413:palmatine