Data for: Comparisons of the pharmacokinetic and tissue distribution profilesof withanolide B after intragastric administration of the effective part of Datura metel L. in normal and psoriasis guinea pigs

A simple, highly sensitive ultra-performance liquid chromatography- electrospray ionization-mass spectrometry (LC-ESI-MS) method has been developed to quantify of withanolide B and obakunone (IS) in guinea pig plasma and tissues, and to compare the pharmacokinetics and tissue distribution of withanolide B in normal and psoriasis guinea pigs. After mixing with IS, plasma and tissues were pretreated by protein precipitation with methanol.

Chromatographic separation was performed on a C18 column using aqueous (0.1% formic acid) and acetonitrile (0.1% formic acid) solutions at 0.4 mL/min as the mobile phase. The gradient program was selected. Detection was performed on a 4000 QTRAP UPLC–ESI-MS/MS system from AB Sciex in the multiple reaction monitoring (MRM) mode.