Figure 5
From: Molecular degradation of ancient documents revealed by 1H HR-MAS NMR spectroscopy
Enlarged view of 1H HR-MAS NMR spectra shown in Fig. 2.
Ancient samples A1 (red line), B1 (brown line) and A3 (dark green line) (panel A); modern samples P2 (black line), P2C9024 (grey line) and P2C9048 (light green line) (Panel B); the weighted linear combination of aminoacids 1H HR-MAS NMR spectra (see text for details) obtained from on-line NMR databases28,29 (blue line) is plotted for comparison at the bottom of both panels. The smaller presence of collagen NMR features in A3 is due to the intense degradation of this sample14. As a consequence, collagen underwent heavy chemical and biological degradation processes which have strongly reduced its original amount in the paper.
