Metabolite profiling of 100- and 1,000-fold diluted urine and plasma samples from a conventional radiolabeled human ADME study is described using a highly sensitive LC-AMS technique. The concentration of radioactivity and the metabolic profiles in urine and plasma determined using this technique were similar to those employing standard off-line (i.e. LSC) or in-line (i.e. β-RAM or LC-ARC dynamic-flow) radioactivity monitoring techniques. The results indicate that at a simulated ca. 100 nCi clinical dose, plasma and urine concentrations of 14C, as well as their metabolic profiles, may be determined routinely by LC-AMS. This approach opens the possibility of using LC-AMS for both the highthroughput quantitation of biological samples and the generation of high-resolution chromatographic profiles of complex mixtures at a lower cost than current AMS analyses that require the conversion of sample carbon to graphite, a laborious and time consuming process.
Keywords: AMS, metabolic profiles, microdose, humans, plasma, urine, radioactivity
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