Sang H, Wang Y, Zhong Y, Gu S, Wang G, Sun J, Peng Y. Quantitative determination of proxalutamide in rat plasma and tissues using liquid chromatography/tandem mass spectrometry.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021;
35:e9003. [PMID:
33169448 DOI:
10.1002/rcm.9003]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/28/2020] [Accepted: 11/04/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE
Proxalutamide is a novel drug for the treatment of prostate cancer. However, to date, there are almost no reports on the pharmacokinetics of proxalutamide in vivo. This study developed a liquid chromatography/tandem mass spectrometry (LC/MS/MS) method to determine the concentrations of proxalutamide in biological samples for pharmacokinetic studies.
METHODS
Chromatographic separation was achieved on a Kromasil 100-5C8 column followed by gradient elution using a Shimadzu HPLC system. MS was performed in positive ion electrospray ionization mode using a SCIEX API 4000 triple quadrupole system. A simple and rapid one-step protein precipitation method was used for sample processing, and a low sample volume of 10 μL was used for processing and analysis.
RESULTS
The method was validated to show good selectivity, sensitivity, precision, and accuracy. Good linearity (r2 > 0.99) was observed for rat plasma (range: 2-5000 ng/mL) and rat tissue homogenates (range: 2-2000 ng/mL). The extraction recovery was above 98%, and no significant matrix effect was observed. This method was successfully applied to investigate the pharmacokinetics and tissue distribution of proxalutamide in rats.
CONCLUSIONS
A rapid and sensitive LC/MS/MS method was developed and validated to determine the quantity of proxalutamide in rat plasma and tissue homogenates and to further study the pharmacokinetic parameters of proxalutamide in a rat model. The results showed that proxalutamide had good oral bioavailability and wide tissue distribution in vivo.
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