title: High-performance size-exclusion chromatographic analysis of dextran-methylprednisolone hemisuccinate in rat plasma.
abstract: A size exclusion chromatographic method is presented for the measurement of the concentrations of a macromolecular prodrug of methylprednisolone (MP), dextran-methylprednisolone succinate (DEX-MPS), in rat plasma. After precipitation of the plasma (100 microl) proteins with perchloric acid, the samples are injected into a size exclusion column with a mobile phase of water:acetonitrile:glacial acetic acid (75:25:0.2) and a flow-rate of 1 ml/min. The DEX-MPS conjugate, detected at 250 nm, elutes at a retention time of approximately 6.5 min, free of endogenous peaks. Excellent linear relationships (r2=0.997) were found between the detector response and the concentrations of DEX-MPS in the range of 2-100 microg/ml (MP equivalent), with intra- and inter-run C.V.s of <6% and error values of <5%. The application of the assay was also demonstrated by measurement of the plasma concentrations of DEX-MPS after single 5 or 10 mg/kg doses of the conjugate administered intravenously to rats.
authors.affiliation: School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo 79106, USA. rmehvar@cortex.ama.ttuhsc.edu
authors.forename: R
authors.initials: R
authors.lastname: Mehvar
mesh_terms: D000818:Animals; D002138:Calibration; D002850:Chromatography, Gel / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003911:Dextrans / Q000097:blood*; D008776:Methylprednisolone Hemisuccinate / Q000097:blood*; D051381:Rats; D015203:Reproducibility of Results
chemical_list: D003911:Dextrans; D008776:Methylprednisolone Hemisuccinate