title: High-performance liquid chromatographic column-switching method for two cyclosporine metabolites in blood.
abstract: Cyclosporine (CSA) is biotransformed to many metabolites which may contribute to its immunosuppressive and nephrotoxic activity. We report a rapid and sensitive, automated column-switching high-performance liquid chromatographic (HPLC) method for measuring CSA-M17 in whole blood; the method also separates CSA-M1. CSA metabolite standards were isolated by a preparative-scale HPLC method. Samples were prepared by protein precipitation with acetonitrile followed by dilution with water. CSA-M17 was initially separated on a C8 column; final separation was on a C18 column. The inter-day relative standard deviation at 50 ng/ml was 8% (n = 3). Limit of detection was 20 ng/ml.
authors.affiliation: Fred Hutchinson Cancer Research Center, Seattle, WA 98104.
authors.forename: D J
authors.initials: DJ
authors.lastname: Gmur
authors.forename: P
authors.initials: P
authors.lastname: Meier
authors.forename: G C
authors.initials: GC
authors.lastname: Yee
mesh_terms: D001711:Biotransformation; D016026:Bone Marrow Transplantation; D002851:Chromatography, High Pressure Liquid; D003524:Cyclosporins / Q000097:blood*; D006801:Humans; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D008297:Male
chemical_list: D003524:Cyclosporins; D007202:Indicators and Reagents