Fig. 1: Identification of Gly peptides formed in the evaporation experiment.

a Liquid chromatography–mass spectrometry (LC–MS) analysis of Gly_1–6. b LC–MS analysis of Gly_6–17. Note that a diluted sample of (b) was analyzed in (a). Gly_1–6 were identified and quantified according to mass and LC–MS retention time using commercially available standards. Gly_7–17 were identified by an increasing trend in LC–MS retention time. Detection of the product peptides was limited to short oligomers due to the low solubilities of long oligomers. c Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) analysis of the product peptides. Both [M+Na]⁺ and [M+H]⁺ ions were detected for many peptides.