title: Quantitation of a new cholecystokinin and gastrin receptor antagonist (L-365,260) in dog and rat plasma by high-performance liquid chromatography.
abstract: A high-performance liquid chromatographic (HPLC) procedure has been developed for the quantification of L-365,260 (I), a cholecystokinin and gastrin receptor antagonist, in dog and rat plasma. The method involves liquid-liquid extraction and HPLC with ultraviolet detection. Standard curves were linear over the range 7.5-2000 ng/ml for rat and dog plasma. The method is reproducible and reliable with a detection limit of 7.5 ng/ml in biological fluids. The mean coefficients of variation for concentrations within the range of the standard curve range were 3.84 and 2.56%, respectively, for intra-day analysis and 4.48 and 4.26%, respectively, for inter-day analysis. Application of the development was successfully demonstrated by quantifying the concentration of I in both dog and rat plasma samples following an intravenous or oral dose of 5 mg/kg I.
authors.affiliation: Merck Sharp & Dohme Research Laboratories, West Point, PA 19486.
authors.forename: I W
authors.initials: IW
authors.lastname: Chen
authors.forename: J H
authors.initials: JH
authors.lastname: Lin
authors.forename: J
authors.initials: J
authors.lastname: Dorley
mesh_terms: D000818:Animals; D001570:Benzodiazepinones / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D004285:Dogs; D006207:Half-Life; D008297:Male; D010671:Phenylurea Compounds; D051381:Rats; D017207:Rats, Sprague-Dawley; D011949:Receptors, Cholecystokinin / Q000037:antagonists & inhibitors*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001570:Benzodiazepinones; D010671:Phenylurea Compounds; D011949:Receptors, Cholecystokinin; C058121:L 365260