Journal
MOLECULES
Volume 17, Issue 4, Pages 4733-4754Publisher
MDPI
DOI: 10.3390/molecules17044733
Keywords
salidroside; p-tyrosol; metabolite; LC-MS/MS; pharmacokinetics
Funding
- Zhejiang Provincial Natural Science Foundation of China [Z2100435]
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Salidroside and its aglycone p-tyrosol are two major phenols in the genus Rhodiola and have been confirmed to possess various pharmacological properties. In our present study, p-tyrosol was identified as the deglycosylation metabolite of salidroside after intravenous (i.v.) administration to rats at a dose of 50 mg/kg, but was not detectable after intragastric gavage (i.g.) administration through HPLC-photodiode array detection (PDA) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. Next, an accurate and precise LC-MS/MS method was developed to quantitatively determine salidroside and p-tyrosol in rat plasma samples. Samples were analyzed by LC-MS/MS on a reverse-phase xTerra MS C18 column which was equilibrated and eluted with an isocratic mixture of acetonitrile-water (1: 9, v/v) at a flow rate of 0.3 mL/min. The analytes were monitored by multiple reaction monitoring (MRM) under the negative electrospray ionization mode. The precursor/product transitions (m/z) were 299.0 -> 118.8 for salidroside, 137.0 -> 118.9 for p-tyrosol and 150.1 -> 106.9 for the internal standard (IS), paracetamol, respectively. The calibration curve was linear over the concentration ranges of 50-2,000 ng/mL for salidroside and 20-200 ng/mL for p-tyrosol. The inter- and intra-day accuracy and precision were within +/- 15%. The method has been successfully applied to the pharmacokinetic study and the oral bioavailability was calculated.
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