Assay for levormeloxifene, a selective estrogen receptor modulator, in human and monkey plasma employing high-performance liquid chromatography and solid-phase extraction.
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.
Kiehr
B
B
Pharmacokinetics, Health Care Discovery and Development, Novo Nordisk, Maaloev, Denmark.
Christensen
M S
MS
D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008252:Macaca fascicularis; D011759:Pyrrolidines / Q000097:blood*; D011960:Receptors, Estrogen / Q000187:drug effects; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence
D011759:Pyrrolidines; D011960:Receptors, Estrogen; C108255:levormeloxifene