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. Author manuscript; available in PMC: 2020 Jul 10.
Published in final edited form as: J Am Chem Soc. 2019 Jun 28;141(27):10711–10721. doi: 10.1021/jacs.9b03254

Figure 4.

Figure 4.

Inactivated samples were treated with trifluoroacetic acid and filtered through a 30 kDa MWCO filter. The flowthrough was then processed for LC–MS. The TFA-treated flowthrough (B) and a non-TFA-treated control (A) were run in an untargeted fashion. Extracted ion chromatograms for PLP (248.02–248.04 m/z) and PMP (249.04–249.06 m/z) are shown. See Supporting Information Figure S3 for the mass spectra of PLP and PMP standards.