Rapid and sensitive LC-MS/MS method for the determination of metoprolol in Beagle dog plasma with a simple protein precipitation treatment and its pharmacokinetic applications.

A rapid LC-MS/MS method with good accuracy and sensitivity was developed and validated for the pharmacokinetics study of metoprolol (MP) in beagle dogs. The plasma samples were simply precipitated by methanol and then analyzed by LC-MS/MS. An Ultimate XB-C₁₈ column (150 × 2.

Determination of cyclobenzaprine in human plasma by liquid chromatography-electrospray ionization tandem mass spectrometry and its application in a pharmacokinetic study.

A sensitive, rapid and simple liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS/MS) method was developed for the quantitative determination of cyclobenzaprine in human plasma, to study the pharmacokinetic behavior of cyclobenzaprine capsule in healthy Chinese volunteers. With escitalopram as the internal standard (IS), sample pretreatment involved a one-step liquid-liquid extraction using saturated sodium carbonate solution and hexane-diethyl ether (3:1, v/v). The separation was performed on an Ultimate XB-CN column (150 × 2.

Simultaneous determination of 3,3',4',5,7-pentamethylquercetin and its possible metabolite 3,3',4',7-tetramethylquercetin in dog plasma by liquid chromatography-tandem mass spectrometry and its application to preclinical pharmacokinetic study.

A sensitive, simple and rapid ultra fast liquid chromatography (UFLC)-ESI-MS/MS method was established for the simultaneous determination of 3,3',4',5,7-pentamethylquercetin (PMQ) and its possible metabolite 3,3',4',7-tetramethylquercetin (TMQ) in dog plasma using 4',5,7-trimethylapigenin (TMA) as the internal standard. The plasma sample was pretreated with acetonitrile for protein precipitation and the analytes were separated on an Ultimate XB-CN column (5 μm, 2.1 mm × 150 mm) with the mobile phase consisting of acetonitrile and water (2:1, v/v).