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. Author manuscript; available in PMC: 2016 Dec 16.
Published in final edited form as: Protein Expr Purif. 2015 Jul 29;116:82–89. doi: 10.1016/j.pep.2015.07.012

Fig. 4.

Fig. 4

An ESI mass spectrum of the HPLC-purified 15N Aβ42 peptide in positive ion mode. (A) Full spectrum depicting various charge states of 15N isotope-labeled Aβ42 peptide. (B) Isotopic distribution of +4 charged species (top panel) and theoretical simulation of +4 charged species generated from 15N Aβ42 peptide in Xcaliber (bottom panel). (C) A deconvolution of the peaks from full spectrum to generate monoisotopic mass of the 15N Aβ42 peptide.