title: New approaches for quantifying hyaluronic acid in pharmaceutical semisolid formulations using HPLC and CZE.
abstract: HA was quantified in pharmaceutical formulations using HPLC-UV-detector and spectrophotometrically after the digestion with concentrated H(2)SO(4). Intact HA was quantified by capillary zone electrophoresis (CZE) using direct and indirect methods. The results were compared with the carbazole reaction established by Bitter et al. (Anal. Biochem. 4 (1997) 330) and with established method from Pläzer et al. (J. Pharm. Biomed. Anal. 21 (1997) 491) regarding detection limits, linearity, reproducibility and simplicity. The present results show that the investigation using HPLC and CZE led to a considerable improvement of the detection limit [0.3 ng/ml (HPLC1), 1 microgram/ml (HPLC2) and 5 microgram/ml (CE-D1)] compared with other methods (10 microgram/ml).
authors.affiliation: Institute of Pharmaceutics and Biopharmaceutics, Martin-Luther-University Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120, Halle/S., Germany.
authors.forename: Jamal Alyoussef
authors.initials: JA
authors.lastname: Alkrad
authors.forename: Yahya
authors.initials: Y
authors.lastname: Merstani
authors.forename: Reinhard H H
authors.initials: RH
authors.lastname: Neubert
mesh_terms: D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D019075:Electrophoresis, Capillary / Q000379:methods; D006820:Hyaluronic Acid / Q000032:analysis* / Q000737:chemistry
chemical_list: D006820:Hyaluronic Acid