title: Capillary zone electrophoresis as a tool for the quality control of goldenseal extracts.
abstract: The root extracts of goldenseal (Hydrastis canadensis L.) are popular phytomedicines for the treatment of gastrointestinal disorders and upper respiratory tract infections. Here we describe a simple and fast capillary zone electrophoresis (CZE) method with ultraviolet detection at 225 nm for the quantification of the major goldenseal constituents, berberine and hydrastine, in herbal remedies containing goldenseal root extracts. Tritoqualine, an antihistaminic drug with a hydrastine-like phthalidisoquinoline structure, was applied as an internal standard. The running buffer was a 1:5 mixture of 500 mM ammonium acetate (adjusted to pH 3.4 with acetic acid) and methanol. Our newly developed CZE method was validated regarding limit of detection (LOD), limit of quantification, linearity, accuracy and precision. For both berberine and hydrastine, the LOD was 1.0 microg/mL and the linearity was obtained between 2.5 and 500 microg/mL. Using our newly developed method, both the alkaloids could be analysed in herbal remedies containing goldenseal root extracts within 8 min.
authors.affiliation: Institute of Pharmacy and Food Chemistry, Julius Maximilians-University, Würzburg, Germany. m.unger@pzlc.uni-wuerzburg.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Unger
authors.forename: Stefanie
authors.initials: S
authors.lastname: Laug
authors.forename: Ulrike
authors.initials: U
authors.lastname: Holzgrabe
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D044182:Benzylisoquinolines; D001599:Berberine / Q000032:analysis*; D019587:Dietary Supplements / Q000032:analysis; D019075:Electrophoresis, Capillary; D039321:Hydrastis / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry* / Q000592:standards*; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000470:Alkaloids; D044182:Benzylisoquinolines; D010936:Plant Extracts; D001599:Berberine; C013024:hydrastine