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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Anal Chem. 2011 Apr 5;83(9):3252–3255. doi: 10.1021/ac200439k

Figure 1.

Figure 1

Charge inverted arginine from positive to negative reacting with PAMAM 1.5 isolated [PAMAM-6H]6− charge state. (a) cation only spectrum of arginine, and (b) charge inverted spectrum of arginine. The small peaks between the main PAMAM charge states arise from PAMAM fragment ions. The small peaks near deprotonated arginine may also arise from the PAMAM anions but more likely arise from charge inversion of low level species present in the broad isolation window used for the cations.