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Assay for levormeloxifene, a selective estrogen receptor modulator, in human and monkey plasma employing high-performance liquid chromatography and solid-phase extraction
Authors:Benedicte Kiehr  Michael S. Christensen
Abstract:
Assays for levormeloxifene, a new selective estrogen receptor modulator, and its 7-desmethyl metabolite in human and cynomolgus monkey plasma are described. Plasma was extracted on mixed-mode bonded sorbent material (C8/SCX) and the extracts were analysed by high-performance liquid chromatography with fluorescence detection. Recoveries of levormeloxifene and the metabolite exceeded 70%. Within and total assay precision calculated as a coefficient of variation (C.V.) were <8% for both compounds at all concentration levels, except at the limit of quantitation (LOQ) where the C.V. was 15%. Within and total-assay accuracy calculated as a percentage of the nominal value were between 90 and 114% for both analytes. The LOQ was for levormeloxifene and 7-desmethyllevormeloxifene, respectively, 1.5 and 2.5 ng/ml (man) and 5.2 and 6.9 ng/ml (monkey). In the monkey plasma assay, human plasma could substitute monkey plasma as blank plasma.
Keywords:Levormeloxifene
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