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. Author manuscript; available in PMC: 2020 Apr 28.
Published in final edited form as: Anal Chem. 2019 Sep 6;91(18):11952–11962. doi: 10.1021/acs.analchem.9b02808

Table 2.

Shifts in Relative Mobilities of the Mixture of Protonated Arginine Ion Isotopologues in Both Helium and Nitrogena

Species [M + H]+ m/z Theoretical KL/KH(Helium) Experimental KL/KH(Helium) Theoretical KL/KH (Nitrogen) Experimental KL/KH(Nitrogen)
unsubstituted 175 1 (reference) 1 (calibrant) 1 (reference) 1 (calibrant)
15N4 179 1.00025 1.00073 ± (6 × 10−05) 1.00156 1.00165 ± (1.7 × 10−04)
13C6 181 1.00037 0.99983 ± (6 × 10−05) 1.00232 1.00238 ± (2.3 × 10−04)
13C615N4 185 1.00061 1.00061 ± (calibrant) 1.00378 1.00378 ± (calibrant)
13C615N42H7 192 1.00100 1.00022 ± (4 × 10−05) 1.00623 1.00579 ± (2.2 × 10−04)
a

Error represents the standard deviation for 6 averaged replicates.