title: Simple high-performance liquid chromatographic method for determination of losartan and E-3174 metabolite in human plasma, urine and dialysate.
abstract: A simple high-performance liquid chromatographic (HPLC) method was developed for the determination of losartan and its E-3174 metabolite in human plasma, urine and dialysate. For plasma, a gradient mobile phase consisting of 25 mM potassium phosphate and acetonitrile pH 2.2 was used with a phenyl analytical column and fluorescence detection. For urine and dialysate, an isocratic mobile phase consisting of 25 mM potassium phosphate and acetonitrile (60:40, v/v) pH 2.2 was used. The method demonstrated linearity from 10 to 1000 ng/ml with a detection limit of 1 ng/ml for losartan and E-3174 using 10 microl of prepared plasma, urine or dialysate. The method was utilized in a study evaluating the pharmacokinetic and pharmacodynamic effects of losartan in patients with kidney failure undergoing continuous ambulatory peritoneal dialysis (CAPD).
authors.affiliation: Division of Clinical Pharmacology, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0160, USA.
authors.forename: D
authors.initials: D
authors.lastname: Farthing
authors.forename: D
authors.initials: D
authors.lastname: Sica
authors.forename: I
authors.initials: I
authors.lastname: Fakhry
authors.forename: A
authors.initials: A
authors.lastname: Pedro
authors.forename: T W
authors.initials: TW
authors.lastname: Gehr
mesh_terms: D000959:Antihypertensive Agents / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D015314:Dialysis Solutions / Q000032:analysis; D006801:Humans; D007093:Imidazoles / Q000032:analysis* / Q000097:blood / Q000652:urine; D007676:Kidney Failure, Chronic / Q000378:metabolism; D019808:Losartan / Q000032:analysis* / Q000097:blood / Q000652:urine; D010531:Peritoneal Dialysis, Continuous Ambulatory; D012680:Sensitivity and Specificity; D013777:Tetrazoles / Q000032:analysis* / Q000097:blood / Q000652:urine
chemical_list: D000959:Antihypertensive Agents; D015314:Dialysis Solutions; D007093:Imidazoles; D013777:Tetrazoles; C066026:losartan carboxylic acid; D019808:Losartan