Skip to main content
. Author manuscript; available in PMC: 2020 Jul 16.
Published in final edited form as: Anal Chem. 2019 Jun 26;91(14):9238–9245. doi: 10.1021/acs.analchem.9b02134

Figure 5.

Figure 5

Labeling of phenylalanine: Normalized +18O fraction determined under number-coded experimental conditions (Table 1) for two representative peptides from (a) BSA digest and (b) RTC. Error bars represent standard deviations of three and two independent runs for BSA digest and RTC, respectively. Dashed horizontal line represents calculated background A + 2 fraction. (c) Proposed reaction pathway based on the results. Oxygen highlighted in red represents 18O, and red arrows denote preferred pathway.