title: Capillary electrophoresis for the assay of fixed-dose combination tablets of artesunate and amodiaquine.
abstract: BACKGROUND
  Quality control of drugs in formulations is still a major challenge in developing countries. For the quality control of artesunate and amodiaquine tablets in fixed-dose combination, only liquid chromatographic methods have been proposed in the literature. There are no capillary electrophoretic methods reported for the determination of these active substances, although this technique presents several advantages over liquid chromatography (long lifetime, low price of the capillary, low volumes of electrolyte consumption) in addition to simplicity. In this paper, a reliable capillary electrophoresis method has been developed and validated for the quality control of these drugs in commercial fixed-dose combination tablets.
  
  
  METHODS
  Artesunate and amodiaquine hydrochloride in bilayer tablets were determined by micellar electrokinetic capillary chromatography (MEKC). Analytes were extracted from tablets by sonication with a solvent mixture phosphate buffer pH 7.0-acetonitrile containing benzoic acid as internal standard. Separation was carried out on Beckman capillary electrophoresis system equipped with fused silica capillary, 30 cm long (20 cm to detector) × 50 μm internal diameter, using a 25 mM borate buffer pH 9.2 containing 30 mM sodium dodecyl sulfate as background electrolyte, a 500 V cm(-1) electric field and a detection wavelength of 214 nm.
  
  
  RESULTS
  Artesunate, amodiaquine and benzoic acid were separated in 6 min. The method was found to be reliable with respect to specificity,linearity of the calibration line (r(2) > 0.995), recovery from synthetic tablets (in the range 98-102%), repeatability (RSD 2-3%, n = 7 analytical procedures). Application to four batches of commercial formulations with different dosages gave content in good agreement with the declared content.
  
  
  CONCLUSIONS
  The MEKC method proposed is reliable for the determination of artesunate and amodiaquine hydrochloride in fixed-dose combination tablets. The method is well-suited for drug quality control and detection of counterfeit or substandard medicines.
authors.affiliation: Laboratoire de Chimie Analytique, Contrôle Physico-Chimique des Médicaments, Institut des Biomolécules Max Mousseron, UMR 5247, Faculté de Pharmacie, Montpellier, BP 14491-34093, France.
authors.forename: N'Cho Christophe
authors.initials: NC
authors.lastname: Amin
authors.forename: Marie-Dominique
authors.initials: MD
authors.lastname: Blanchin
authors.forename: Michèle
authors.initials: M
authors.lastname: Aké
authors.forename: Jérôme
authors.initials: J
authors.lastname: Montels
authors.forename: Huguette
authors.initials: H
authors.lastname: Fabre
mesh_terms: D000655:Amodiaquine / Q000032:analysis*; D000962:Antimalarials / Q000032:analysis*; D037621:Artemisinins / Q000032:analysis*; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D004338:Drug Combinations; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013607:Tablets / Q000737:chemistry*
chemical_list: D000962:Antimalarials; D037621:Artemisinins; D004338:Drug Combinations; D013607:Tablets; C515299:amodiaquine, artesunate drug combination; D000655:Amodiaquine