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. Author manuscript; available in PMC: 2016 Sep 14.
Published in final edited form as: Anal Chem. 2015 Oct 5;87(20):10183–10187. doi: 10.1021/acs.analchem.5b02603

Figure 2.

Figure 2

Chromatograms of fortified urine samples analyzed on the Sciex triple quadrupole 6500. Chromatograms illustrated in left column (0.010 ng/mL) and right column (0.025 ng/mL) were for “free” (“unconjugated”) and “total” (“conjugated” + “unconjugated”) concentrations, respectively.