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Determination of metoprolol and its metabolite α-hydroxymetoprolol in serum by HPLC method with fluorescence detection


Authors: I. Peřinová;  J. Ďuricová;  H. Brozmanová;  I. Kacířová;  M. Grundmann
Authors place of work: Ostravská univerzita Ostrava, Ústav klinické farmakologie FN a Zdravotně-sociální fakulty
Published in the journal: Čes. slov. Farm., 2008; 57, 254-259
Category: Původní práce

Summary

High-performance liquid chromatography method has been developed with a view of its future use in the phenotyping of CYP2D6 enzyme by metoprolol as a probe drug. Metoprolol, α‑hydroxymetoprolol and the internal standard nadolol were extracted from serum with dichloromethane alkalinized with 1 mol/l NaOH. Chromatographic separations were performed on the reversed-phase column SupercosilTM LC-18 (15 cm × 3 mm, 5 μm) with the mobile phase containing acetonitril : methanol : water : triethylamine (15 : 5 : 80 : 0.1, pH 3.0) at a flow rate of 0.7 ml/min. Fluorescence detection (FL) was made at 230 nm (excitation) and 300 nm (emission). The total analysis time was 12 min. The retention time for α-hydroxymetoprolol, nadolol and metoprolol were 2.04, 3.02 and 9.04 min, respectively. The intra-assay and inter-assay precisions (coefficients of variation) were less than 7.2 %, and recovery values were found to be within 98.2–103.0 %. The calibration curve of the method was linear over a concentration range of 25–500 ng/ml (r = 0.999) for both compounds. The limit of detection was 5 ng/ml and the limit of quantification was 25 ng/ml for both metoprolol and α-hydroxymetoprolol. The reported method could be suitable for measurements of metoprolol and α-hydroxymetoprolol in serum from patients with hypertension, IHD and other illnesses.

Key words:
phenotyping CYP2D6 – metoprolol – α-hydroxymetoprolol – HPLC-FL


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Štítky
Farmacie Farmakologie

Článek vyšel v časopise

Česká a slovenská farmacie

Číslo 6

2008 Číslo 6
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