title: Determination of a cyclic guanine monophosphate phosphodiesterase inhibitor (SCH 51866) in rat serum using capillary zone electrophoresis.
abstract: A capillary zone electrophoretic (CZE) assay was developed for the determination of cis-5,6a,7,8,9,9a-hexahydro-2-[4-(trifluoromethyl)phenylmethyl]-5-methyl - cyclopent[4,5]imidazo[2,1-b]purin-4(3H)-one, SCH 51866 (I), a cyclic guanine monophosphate phosphodiesterase inhibitor, in rat serum using acetonitrile deproteination as a clean-up step before injection. The calibration curve was linear over a serum concentration range of 0.5 to 10 micrograms/ml serum with a correlation coefficient (r) > 0.99. The limit of quantitation (LOQ) was established at 0.5 micrograms/ml. Fifty microliters of serum were used for analysis, which allowed serial bleeding (8 samples) from a single rat to characterize the pharmacokinetic profile of I after either oral or intravenous drug administration. In traditional pharmacokinetic and toxicokinetic studies in rodents, one animal provides only one serum sample since 1 to 2 ml of sample volume is required for chromatographic analysis, resulting in the use of a large number of animals per study. This assay yields a significant reduction in the use of animals, hence providing a large reduction in resources and time in drug discovery and development.
authors.affiliation: Department of Drug Metabolism and Pharmacokinetics, Schering-Plough Research Institute, Kenilworth, NJ 07033, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Tian
authors.forename: R
authors.initials: R
authors.lastname: Watkins
authors.forename: J
authors.initials: J
authors.lastname: Cook
authors.forename: C
authors.initials: C
authors.lastname: Lin
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000037:antagonists & inhibitors*; D000284:Administration, Oral; D000818:Animals; D019075:Electrophoresis, Capillary / Q000379:methods*; D004791:Enzyme Inhibitors / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D007093:Imidazoles / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D007262:Infusions, Intravenous; D015394:Molecular Structure; D051381:Rats; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004791:Enzyme Inhibitors; D007093:Imidazoles; D015106:3',5'-Cyclic-GMP Phosphodiesterases; C096501:SCH 51866