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. Author manuscript; available in PMC: 2011 Apr 15.
Published in final edited form as: Anal Chem. 2010 Apr 15;82(8):3212–3221. doi: 10.1021/ac902837x

Figure 1.

Figure 1

Negative ion mass spectrum of arginine standard at 10 µg/mL showing the base peak at m/z 173.1044, and its natural isotope peaks with one 15N (m/z 174.1012) and one 13C (m/z 174.1077). The latter two were not resolved at a resolution setting of 10,000 or 25,000, partially separated at 50,000, and well separated at 100,000.