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. Author manuscript; available in PMC: 2019 Mar 15.
Published in final edited form as: Anal Biochem. 2018 Mar 15;545:72–77. doi: 10.1016/j.ab.2018.01.018

Fig. 1.

Fig. 1

Ion chromatograms for amino acid standards detected by multiple reaction monitoring. (A) Total ion count of mixed amino acid standards Lys (3.75 pmol), Gln (3.75 pmol), methyl-Lys (1meK, 2meK, 3meK; 1.5 pmol each), Arg (750 fmol), and methyl-Arg (1meR, 1.5 pmol; 2meR, 0.75 pmol each of ADMA and SDMA), where each color represents the measured ion intensity of an individual transition precursor/product ion pair (see Table 1). (B) LC-MS/MS chromatograms of individual amino acid standards extracted from Panel A. The separation of all amino acids standards was completed within 10 min.