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. Author manuscript; available in PMC: 2006 May 26.
Published in final edited form as: Mol Vis. 2005 Dec 28;11:1211–1219.

Figure 1.

Figure 1

Mass spectrum of the 30 day deamidation sample of GlyIleAsnAlaGly. The peptide was incubated in 37.00 °C, pH 7.4, 0.15 M Tris-HCl buffer for 54 days. It was diluted 100 fold in H2O and then further diluted 3 fold with 49/49/2 H2O/methanol/acetic acid before being introducted by electrospray into the Fourier transform mass spectrometer. Peak A is the first isotopic peak. Peak B is the deamidation product from deamidation of the first isotopic peak. Peak A+1 of the doublet is the second isotopic peak.