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Quantitative determination of zolmitriptan in rat blood and cerebrospinal fluid by reversed phase HPLC–ESI-MS/MS analysis: application to in vivo preclinical pharmacokinetic study

Dalpiaz, Alessandro and Marchetti, Nicola and Cavazzini, Alberto and Pasti, Luisa and Velaga, Sitaram and Gavini, Elisabetta and Beggiato, Sarah and Ferraro, Luca (2012) Quantitative determination of zolmitriptan in rat blood and cerebrospinal fluid by reversed phase HPLC–ESI-MS/MS analysis: application to in vivo preclinical pharmacokinetic study. Journal of Chromatography B, Vol. 901 , p. 72-78. eISSN 1873-376X. Article.

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DOI: 10.1016/j.joms.2012.06.013

Abstract

A fast HPLC–ESI-MS/MS method has been developed and validated for the quantification of the potent and selective antimigraine zolmitriptan in rat blood and cerebrospinal fluid (CSF). The assay has been then applied for in vivo preclinical studies. The analytical determination has been used to obtain pharmacokinetics of zolmitriptan in the two biological matrices after its intravenous or nasal administration. Liquid–liquid extraction of zolmitriptan was performed from 100 μL rat blood samples in the presence of N6-cyclopentyladenosine (internal standard) with the employment of ethyl acetate. Calibration standards were prepared by using blood matrix and following the same liquid–liquid extraction procedure. CSF samples were analyzed without any pre-treatment steps and by using an external calibration method in pure water matrix. Chromatographic separation was performed under reversed phase and a gradient elution condition on a C18 packed column (100 × 2.0 mm, 2.5 μm particles diameter). The mobile phase was a mixture between acetonitrile, water and formic acid (0.1% v/v). The applied HPLC–MS/MS method allowed low limits of detection, as calculated from calibration curves, of 6.6 and 24.4 ng/mL for water matrix and rat blood extracts, respectively. Linearity of the calibration curves was established up to 5 μM (1.44 μg/mL), as well as good assay accuracy. The intravenous infusion of 20 μg zolmitriptan to male Sprague-Dawley rats produced blood concentrations ranging from 9.4 ± 0.7 to 1.24 ± 0.07 μg/mL within 10 h, with a terminal half-life of 3.4 ± 0.2 h. The nasal administration of a water suspension of 20 μg zolmitriptan produced blood concentrations ranging from 2.92 ± 0.21 to 0.85 ± 0.07 μg/mL within 6 h. One hour after zolmitriptan intravenous infusion or nasal administration, its CSF concentrations were 0.0539 ± 0.0016 and 0.0453 ± 0.0012 μg/mL, respectively. This study determined the suitability of the herein proposed method to investigate the pharmacokinetics of zolmitriptan after its administration by means of novel formulations and, hence, to evaluate the efficacy of innovative nose-to-brain drug delivery in preclinical studies.

Item Type:Article
ID Code:8707
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zolmitriptan, HPLC–ESI-MS/MS, rat blood samples, rat cerebrospinal fluid samples, pharmacokinetics
Subjects:Area 03 - Scienze chimiche > CHIM/09 Farmaceutico tecnologico applicativo
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Chirurgiche, Microchirurgiche e Mediche
Publisher:Elsevier
eISSN:1873-376X
Deposited On:27 Feb 2013 17:16

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