title: Determination of N-(trans-4-isopropylcyclohexanecarbonyl)-D-phenylalanine and its metabolites in human plasma and urine by column-switching high-performance liquid chromatography with ultraviolet detection.
abstract: A simple, rapid and sensitive two column-switching high-performance liquid chromatographic (HPLC) method with ultraviolet detection at 210 nm has been developed for the determination of N-(trans-4-isopropylcyclohexanecarbonyl)-D-phenylalanine (AY4166, I) and its seven metabolites in human plasma and urine. Measurements of I and its metabolites were carried out by two column-switching HPLC, because metabolites were classified into two groups according to their retention times. After purification of plasma samples using solid-phase extraction and direct dilution of urinary samples, I and each metabolite were injected into HPLC. The calibration graphs for plasma and urinary samples were linear in the ranges 0.1 to 10 microg ml(-1) and 0.5 to 50 microg ml(-1), respectively. Recoveries of I and its seven metabolites were over 88% by the standard addition method and the relative standard deviations of I and its metabolites were 1-6%.
authors.affiliation: Ajinomoto Co., Inc., Central Research Laboratories, Kawasaki, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Ono
authors.forename: K
authors.initials: K
authors.lastname: Matsuda
authors.forename: S
authors.initials: S
authors.lastname: Kanno
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003510:Cyclohexanes / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D006801:Humans; D007004:Hypoglycemic Agents / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D000077715:Nateglinide; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine; D012015:Reference Standards; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003510:Cyclohexanes; D007004:Hypoglycemic Agents; D000077715:Nateglinide; D010649:Phenylalanine