title: High-performance liquid chromatography method for assay of diltiazem hydrochloride and its related compounds in bulk drug and finished tablets.
abstract: The method provides for the resolution of trans-diltiazem and seven known and several unknown related compounds from diltiazem HCl. Minimum detectable amounts were less than 0.1%, except for an intermediate which originates early in the synthetic process, for which the sensitivity is approximately 2%. The relative standard deviation of the assay procedure is 0.15%. Total related compounds in four bulk drug and four tablet samples were less than 0.25%. The specific rotation of four samples of diltiazem HCl analyzed in duplicate was between +112 and +114 degrees. The UV absorption spectra of all compounds exhibited two maxima, one between 203 and 213 nm and the other between 230 and 244 nm.
authors.affiliation: Bureau of Drug Research, Health Protection Branch, Tunney's Pasture, Ottawa, Ontario, Canada.
authors.forename: P M
authors.initials: PM
authors.lastname: Lacroix
authors.forename: N
authors.initials: N
authors.lastname: Beaulieu
authors.forename: T D
authors.initials: TD
authors.lastname: Cyr
authors.forename: E G
authors.initials: EG
authors.lastname: Lovering
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004110:Diltiazem / Q000032:analysis*; D004355:Drug Stability; D013056:Spectrophotometry, Ultraviolet; D013607:Tablets
chemical_list: D013607:Tablets; D004110:Diltiazem