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. 2019 Oct 22;4(19):18049–18060. doi: 10.1021/acsomega.9b01885

Figure 4.

Figure 4

Band decomposition in the amide regions of Raman spectra. (A, B) Amide I and (C, D) amide III are decomposed at pH 7 (top) and pH 3 (bottom). Observed spectra are in red (pH 3) and blue (pH 7) colors. Band components are drawn in gray. Empty circles correspond to the sum of the components. See text for details and Table 1 for normalized contributions and their assignments to different secondary structural elements (random, β-strand, and turn). Note that the component at 1721 cm–1 (pink color in (A)) arises from the stretching mode of the carbonyl bond appearing upon the Glu side-chain protonation at pH 3.