Figure 3: Product characterization.
From: Formation of oligopeptides in high yield under simple programmable conditions
(a) Extracted ion chromatograms (EICs) for a series of glycine oligomers—from Gly3 to Gly11—produced in a typical monomeric glycine experiment on analysis by SEC-MS, see Methods sections for details. (b) Typical SEC-MS/MS spectrum of one such species (Gly7, m/z=418.17); the peptide structure is confirmed by fragmentation to β- and γ-series product ions of masses predicted by theory for collision induced dissociation (CID) of Gly7 (see Supplementary Figs 24–28). Infrared showing the comparison of glycine monomer, oligomer standards and the reaction products from the APS. (c) Infrared spectrum in the region 3,600–2,000 wavenumbers showing the N–H amide stretch and (d) infrared spectrum in the region of 1,800–600 wavenumbers showing the C=O amide stretch.
