title: Development and validation of a liquid chromatographic method for the determination of related substances in verapamil hydrochloride.
abstract: The development of a reversed-phase liquid chromatographic method for the determination of related substances in verapamil hydrochloride is described. The method is based on the use of a simple mobile phase on a specialty base-deactivated reversed-phase column. It enables the resolution of 13 related compounds from the parent drug and from each other. Validation of the method showed it to be reproducible, selective, accurate and linear over the concentration range of analysis with a limit of detection of 0.5 microgram ml-1. The developed method proved to be a real improvement compared with the LC test for chromatographic purity described in the USP monograph for verapamil hydrochloride.
authors.affiliation: Pharmaceutical Chemistry Laboratory, Istituto Superiore di Sanità, Rome, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Valvo
authors.forename: R
authors.initials: R
authors.lastname: Alimenti
authors.forename: S
authors.initials: S
authors.lastname: Alimonti
authors.forename: S
authors.initials: S
authors.lastname: Raimondi
authors.forename: F
authors.initials: F
authors.lastname: Foglietta
authors.forename: F
authors.initials: F
authors.lastname: Campana
mesh_terms: D002121:Calcium Channel Blockers / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods; D004355:Drug Stability; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014700:Verapamil / Q000031:analogs & derivatives / Q000032:analysis*
chemical_list: D002121:Calcium Channel Blockers; D014700:Verapamil