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. Author manuscript; available in PMC: 2015 Oct 24.
Published in final edited form as: Anal Chem. 2015 Oct 6;87(19):9829–9837. doi: 10.1021/acs.analchem.5b02217

Figure 1.

Figure 1

Isotope peak distributions of (a) [hIAPP + 4H]4+, (b) [hIAPP + Cu(II) + 2H]4+, (c) [hIAPP + 3H]3+, and (d) [hIAPP + Cu(II) + H]3+. The isotope pattern of copper adducts is shifted by Δm/z 60.9 for both charge states. The acquisition time for each spectrum is 4 s.