Abstract
To develop a rapid and sensitive assay for the simultaneous determination of allopurinol and oxypurinol in serum. High-performance liquid chromatography (HPLC) with UV-detection. Sample preparation consists of protein precipitation by an addition of trichloracetic acid. Percentage recovery and intra-assay coefficient of variation (CV%) for allopurinol were 97.4-101.3 and 0.66-5.13, respectively, in the concentration range 0.5-5.0 microg/mL. For oxypurinol, the percentage recovery and the intra-assay CV% were 93.2-98.1 and 0.88-5.62, respectively, in the concentration ranges 0.4-20 microg/mL. There was no interference of endogenous compounds in this assay. This method is useful for routine therapeutic drug monitoring of allopurinol in a clinical setting.
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