title: Quantitation of the new hypoglycaemic agent AG-EE 388 ZW in human plasma by automated high-performance liquid chromatography with electrochemical detection.
abstract: A sensitive and selective high-performance liquid chromatographic assay has been developed for a new hypoglycaemic agent AG-EE 388 ZW (I) in human plasma. Plasma samples containing I were acidified with 0.2 M hydrochloric acid, directly injected into C2 reversed-phase pre-columns, and cleaned up on-line. After pre-column switching, the substance was separated isocratically in 15 min on a C18 reversed-phase column. Quantitation was performed after amperometric detection by external standard calibration curves. The linearity of the assay was demonstrated over the therapeutic concentration range 5-200 ng/ml. between-day coefficient of variation was 9.2% at 30 ng/ml. The limit of detection was 5 ng/ml in plasma. Determination of human plasma samples after intravenous and oral administration of 1 mg of 14C-labelled I demonstrated the applicability of the assay for pharmacokinetic studies in humans.
authors.affiliation: Department of Pharmacokinetics and Metabolism, Dr. Karl Thomae GmbH, Biberach, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Greischel
authors.forename: K
authors.initials: K
authors.lastname: Beschke
authors.forename: H
authors.initials: H
authors.lastname: Rapp
authors.forename: W
authors.initials: W
authors.lastname: Roth
mesh_terms: D000284:Administration, Oral; D002219:Carbamates / Q000008:administration & dosage / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004563:Electrochemistry; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000097:blood*; D007275:Injections, Intravenous; D010880:Piperidines / Q000008:administration & dosage / Q000097:blood*
chemical_list: D002219:Carbamates; D007004:Hypoglycemic Agents; D010880:Piperidines; C072379:repaglinide