The pharmacokinetics of quinocetone and its major metabolites in healthy swine was investigated in this paper.Quinocetone was administered to 8 healthy cross-bread swine intravenously and orally at a dosage of 4 and 40 mg kg-1 body weight respectively in a randomized crossover design test with two-week washout period.A sensitive high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed for the determination of quinocetone and its metabolite 1-desoxyquinocetone in plasma.Plasma concentration versus time profiles of quinocetone and its metabolite 1-desoxyquinocetone were analyzed by non-compartmental analysis using Winnonlin 5.2 software.Mean maximum concentrations (Cmax) for quinocetone was found to be (0.56±0.13) μg mL-1 at 2.92 h,after oral administration of quinocetone.Mean maximum concentrations (Cmax) for 1-desoxyquinocetone after intravenous or oral administration of quinocetone were (0.0095±0.0012) μg mL-1 at 0.083 h and (0.0067±0.0053) μg mL-1 at 3.08 h.The apparent elimination half-lives (T1/2) for quinocetone and its metabolite 1-desoxyquinocetone were (2.24±0.24) and (5.23±0.56) h after intravenous administration of quinocetone and (2.91±0.29) and (11.85±2.89) h after oral administration of quinocetone,respectively.Mean areas under the plasma concentration-time curve (AUC0-∞) for quinocetone and 1-desoxyquinocetone were (2.02±0.15) and (0.2±0.002) μg h mL-1 respectively after intravenous administration of quinocetone,and (3.5±0.79) and (0.053±0.03) μg h mL-1 after oral administration of quinocetone,respectively.Quinocetone was rapidly absorbed and metabolized in swine after oral and intravenous administration.The plasma concentration-time curve (AUC0-∞) of 1-desoxyquinocetone were much smaller than those of quinocetone,while the elimination half-lives (T1/2) were much longer than those of quinocetone after intravenously (i.v.) or oral administration.
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