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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Biomed Chromatogr. 2014 Aug 28;29(4):570–577. doi: 10.1002/bmc.3315

Figure 2.

Figure 2

Figure 2

Figure 2

Figure 2

Figure 2

Representative LC-MS/MS chromatograms for (A) blank surrogate serum, (B) blank surrogate serum spiked with the IS only, (C) blank surrogate serum spiked with proline (2.5 μg/mL) and the IS, (D) blank surrogate serum spiked with proline (25 μg/mL) and the IS, and (E) a human serum sample.