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- W2022784848 abstract "This report describes a rapid and sensitive analysis for the simultaneous detection of the adenosine A1 receptor ligands N6-cyclopentyladenosine (CPA) and 8-cyclopentyltheophylline (CPT) in rat blood. The method involved alkaline extraction of the compounds and internal standard N6-cyclohexyladenosine (CHA) with ethyl acetate, followed by isocratic reversed-phase high-performance liquid chromatography on a 3-microns MicroSphere C18 column with UV detection at 269 nm. The mobile phase consisted of a mixture of 10 mM acetate buffer (pH 4.0)-methanol-acetonitrile (56:40:4, v/v/v) with a flow-rate of 0.50 ml/min. The total run time was ca. 19 min. For CPA and CPT extraction yields were greater than 77 and 66% in the concentration range of 0.010-0.75 microgram/ml and 0.025-15 micrograms/ml, respectively, with intra- and inter-assay variations less than 9%. In 100 microliter blood samples the corresponding limits of detection were 3.3 and 6.2 ng/ml (signal-to-noise ratio = 3). CPA was found to be degraded in rat blood in vitro with a half-life of 24 min at 37 degrees C. The utility of the analytical method was established by analyzing blood samples from rats which had received an intravenous administration of 200 micrograms/kg CPA or 12 mg/kg CPT. Due to its rapidity and sensitivity this method is concluded to be particularly useful in pharmacokinetic studies with CPA and CPT." @default.
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- W2022784848 title "High-performance liquid chromatography of the adenosine A1 agonist N6-cyclopentyladenosine and the A1 antagonist 8-cyclopentyltheophylline and its application in a pharmacokinetic study in rats" @default.
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- W2022784848 doi "https://doi.org/10.1016/0378-4347(93)80058-c" @default.
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