A sensitive liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) method was established and validated for the determination of glycyrrhizin in dog plasma. After treatment with methanol to precipitate proteins, plasma samples were analyzed on a reversed-phase C18 (ODS) column with a mobile phase of methanol:1% formic acid solution (75 : 25, v / v). MS determination was performed using negative electrospray ionization (negative ESI) in the selected ion monitoring mode. Glycyrrhizin was monitored at the m/z 821 channel and the internal standard (gliquidone) at the m/z 526 channel. The calibration curve was linear over the range from 0.05 μg mL-1 to 10 μg mL-1 with a correlation coefficient above 0.99. This method was successfully applied to the pharmacokinetic studies in beagle dogs. The absolute bioavailability of glycyrrhizin in beagle dogs was 3.24%.
CITATION STYLE
Ren, W., Lu, Y., Jing, J., Zhu, J., Wan, D., Zhao, D., … Chen, X. (2010). Determination of glycyrrhizin in dog plasma by liquid chromatography-mass spectrometry and its application in pharmacokinetic studies. European Journal of Mass Spectrometry, 16(6), 673–678. https://doi.org/10.1255/ejms.1101
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