The lower limit of quantification was 0.200 ng/mL. The between- Rabusertib order and within-run precision for quality controls, expressed as coefficients of variation (CVs), were no greater than 13.9% and 7.50%, respectively, with deviations from nominal concentrations of no more than 12.0%. A method adapted from the plasma bioanalytic method was used to determine the concentrations of GLPG0259 in urine. The internal standard (deuterated GLPG0259; 20 μL at 0.5 μg/mL)
was added to 20 μL of the urine sample. The corresponding solution was diluted 50-fold and injected directly into a Sciex API 4000™ LC–MS/MS. The lower limit of quantification was 2.00 ng/mL. The within-run precision for quality controls, expressed as the CV, was no greater than 6.7%, with deviations from nominal concentrations of no more than 6.5%. Plasma GLPG0259 concentrations were analyzed by a non-compartmental method. The maximum plasma drug concentration (Cmax) and time to reach Cmax (tmax) values were observed directly from the data. The terminal elimination
rate constant (λz) was determined by log-linear regression click here analysis of the elimination phase. The apparent terminal elimination half-life (t1/2,λz), calculated as t1/2,λz = Ln2/λz, was reported only if more than three datapoints were used for linear regression to determine λz with an adjusted r2 value of ≥0.900. Area under the plasma concentration–time curve (AUC) values over the collection ML323 nmr interval (AUCt), over the dosing interval (AUCτ), or extrapolated to infinity (AUC∞) were determined using standard non-compartmental methods (WinNonLin® version 5.2 software; Pharsight
Corporation, Mountain View, CA, USA). The relative bioavailability (Frel) was calculated as the ratio between the AUCs for the test formulations (fumarate capsules or free-base pellet capsules) and the AUCs for the reference formulations (solution or fumarate capsules) from studies stiripentol 3 and 4. After multiple dosing, the accumulation of GLPG0259 was estimated as the ratio between the steady-state AUCτ and the day 1 AUCτ (Rac(AUC)). The following urine parameters were determined after multiple dosing for 5 days (study 1 part 2): the amount of GLPG0259 excreted unchanged in urine (Ae24h), expressed as a percentage of the dose, and renal clearance (CLR) over 24 hours (CLR24h). Methotrexate Plasma methotrexate concentrations were determined using a validated LC–MS/MS assay. In brief, the internal standard (deuterated GLPG0259; 200 μL at 25 ng/mL) was added to plasma samples and then processed by liquid–liquid extraction. The evaporated and reconstituted samples were injected into a Sciex API 4000™ LC–MS/MS equipped with a short HPLC column. Methotrexate was detected with multiple reaction monitoring.
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