Journal Article

A New Assay Based on Solid-Phase Extraction Procedure with LC-MS to Measure Plasmatic Concentrations of Tenofovir and Emtricitabine in HIV Infected Patients

Antonio D'Avolio, Mauro Sciandra, Marco Siccardi, Lorena Baietto, Daniel Gonzalez de Requena, Stefano Bonora and Giovanni Di Perri

in Journal of Chromatographic Science

Volume 46, issue 6, pages 524-528
Published in print July 2008 | ISSN: 0021-9665
Published online July 2008 | e-ISSN: 1945-239X | DOI: https://dx.doi.org/10.1093/chromsci/46.6.524
A New Assay Based on Solid-Phase Extraction Procedure with LC-MS to Measure Plasmatic Concentrations of Tenofovir and Emtricitabine in HIV Infected Patients

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A new solid-phase extraction (SPE) method has been developed and validated on a liquid chromatography (LC) coupled with a mass spectrometer for the determination of plasma concentrations of tenofovir (TNF) and emtricitabine (FTC) in HIV infected patients. Chromatographic separation was achieved with a gradient (acetonitrile and water with formic acid 0.05%) on an Atlantis 4.6 mm × 150 mm, reversed phase analytical column. Detection of TNF, FTC, and internal standard (IS) was achieved by electrospray ionization mass spectrometry (ESI-MS) in the positive ion mode. Calibration ranged from 15.6 to 4000 ng/mL for TNF and 11.7 to 3000 ng/mL for FTC. Plasma was analyzed, and the limit of quantitation was 15.6 ng/mL for TNF and 11.7 ng/mL for FTC; limit of detection was 2 ng/mL for TNF and 1.5 ng/mL for FTC. Mean recovery of TNF, FTC, and IS were 46.5% [relative standard deviation (RSD): 8.8%] and 88.8% (RSD: 1.0%), and 81.7% (RSD: 3.1%), respectively. The method did not show any significant interference with antiretrovirals or other concomitant drugs administered to patients, and no significant “matrix effects” were observed. The method was applied for the determination of antiretroviral plasma concentration of HIV-positive patients treated with FTC and/or TNF, in combination with various other antiretrovirals.

Journal Article.  0 words. 

Subjects: Chemistry

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