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. 2022 Aug 5;45(10):3171–3183. doi: 10.1111/pce.14407

Figure 4.

Figure 4

Mass spectrum of arginine derivatives. (a) chromatogram showing the four products of arginine derivatisation: ornithine lactam 2TMS, ornithine 3TMS, arginine 3TMS and citrulline 3TMS. The mass spectrum of arginine 3TMS and citrulline 3TMS are shown in panels (b) and (c). Typical fragments are illustrated in (d) and (e), respectively. Note that arginine 3TMS and citrulline 3TMS have very close retention times (11.37 and 11.41 min) and thus might appear merged in the same peak under low resolutive conditions.