Rapid simultaneous determination of voriconazole and its N-oxide in human plasma using an isocratic high-performance
Takahiro Yamada1, Yasuaki Mino, Tatsuya Yagi
1Department of Hospital Pharmacy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431–3192, Japan.
Objectives:
The aim of this study was to develop a simultaneous determination method for voriconazole (VRCZ) and its N-oxide (VNO) in human plasma and to apply it to clinical samples.
Design And Methods:
Plasma specimens were deproteinized with acetonitrile and then injected into an HPLC-UV system. VRCZ and VNO were separated on an ODS column filled with 2.3-μm particles using an isocratic mixture of acetonitrile/methanol/phosphate buffer 25/10/65 (v/v/v). Plasma concentrations of VRCZ and VNO in 25 patients were determined.
Results:
Both VRCZ and VNO were linear (r>0.999) over the concentration ranges of 0.1-8.0mg/L. The run time for quantification of the analytes was 4 min. Interindividual variation in the plasma concentration of VRCZ that ranged from less than 0.1 to 6.96 mg/L was observed. VNO concentrations weakly depended on VRCZ dosage.
Conclusions:
The present method can contribute to the optimization of antifungal therapy using VRCZ.
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