title: Ion-pairing high-performance liquid chromatographic method for the determination of 5-aminosalicylic acid and related impurities in bulk chemical.
abstract: An ion-pairing high-performance liquid chromatographic method has been developed for the determination of 5-aminosalicylic acid (5-ASA) bulk chemical in the presence of thirteen potential synthetic process impurities. In addition, the method is suitable for the determination of the in process intermediate, 5-nitrosalicylic acid. A selective method was achieved on a Hypersil-BDS reversed-phase column using 1-heptanesulfonic acid sodium salt as the ion-pairing reagent in a 0.08 M sodium phosphate buffer (pH 2) containing 0.005 M 1-heptanesulfonic acid sodium salt and 0.07 M sodium chloride-methanol-tetrahydrofuran (85:11:4, v/v/v) isocratic mobile phase. The method was validated using a multi-day, intra-laboratory protocol. The validation addressed linearity, accuracy, precision, sensitivity, and ruggedness of the method. The validated method characterizes the purity of 5-ASA bulk chemical.
authors.affiliation: Searle Research and Development, Skokie, IL 60077.
authors.forename: B S
authors.initials: BS
authors.lastname: Kersten
authors.forename: T
authors.initials: T
authors.lastname: Catalano
authors.forename: Y
authors.initials: Y
authors.lastname: Rozenman
mesh_terms: D000636:Aminosalicylic Acids / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000592:standards / Q000706:statistics & numerical data; D004340:Drug Contamination; D019804:Mesalamine; D011786:Quality Control
chemical_list: D000636:Aminosalicylic Acids; D019804:Mesalamine