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. Author manuscript; available in PMC: 2006 Jan 25.
Published in final edited form as: J Am Soc Mass Spectrom. 1996 Sep;7(9):972–976. doi: 10.1016/1044-0305(96)00071-2

Figure 1.

Figure 1

Calculated apparent gas-phase basicity as a function of charge state for arginine-containing peptides (RG)3, +; R6, ▴; (RRGG)3, •; R6G6, *; (RG)6, ○; (RG)10, ▪; (RĀ), R, □; (RG)15, ⋄; (RĀ)14R, ⊗. The GBapp of the n+ charge state reflects the proton transfer reactivity of the (n + 1)+ charge state ion. The dashed line indicates that GB of methanol (174.1 kcal/mol). [The GBapp of the 8 + charge state of (RG)15 is 0.5 kcal/mol greater than the GB of methanol.]