Degradation of urine samples and its influence on the ¹³C/¹²C ratios of excreted steroids.

Abstract

The degradation processes in deficiently stored urine samples are well investigated regarding steroid concentrations and diagnostic ratios, such as the quotient of testosterone divided by epitestosterone. In contrast, nothing is known about the influence on carbon isotope ratios (CIR) by inappropriate storage conditions. In general, it is assumed that… (More)
DOI: 10.1002/dta.219

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