title: Determination of the anti-allergenic agent, 2-methoxy-11-oxo-11H-pyrido[2,1-b]quinazoline-8-carboxylic acid, in biological fluids by high-performance liquid chromatography.
abstract: A rapid, sensitive, and specific high performance liquid chromatographic (HPLC) assay was developed for the determination of 2-methoxy-11-oxo-11H-pyrido-[2,1-b]quinazoline-8-carboxylic acid (I) from biological fluids. The overall recovery from blood and plasma is 69 +/- 10% (S.D.) and 84 +/- 6% (S.D.), respectively, and the sensitivity limit of quantitation is 100 ng/ml by UV absorption and 5 ng/ml by fluorescence detection using a 1 ml specimen. The assay was used in the determination of blood levels of compound in the Rhesus monkey following intravenous administration of a 10 mg/kg dose, and of blood and urine levels of compound I in a dog following intravenous and oral administration of a 1 mg/kg dose.
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004285:Dogs; D000882:Haplorhini; D006634:Histamine H1 Antagonists; D007700:Kinetics; D008253:Macaca mulatta; D008832:Microchemistry; D011725:Pyridines / Q000097:blood* / Q000652:urine; D011799:Quinazolines / Q000097:blood* / Q000652:urine; D013050:Spectrometry, Fluorescence / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D006634:Histamine H1 Antagonists; D011725:Pyridines; D011799:Quinazolines; C023625:2-methoxy-11-oxo-11H-pyrido(2,1-b)quinazoline-8-carboxylic acid