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Table 1 Spectral bands commonly found in parchment from NIR spectroscopy

From: Is there evidence for change to collagen within parchment samples after exposure to an X-ray dose during high contrast X-ray microtomography? a multi technique investigation

Wavelength (nm) Assignment
2310 Lipids
2290 CONH2 specifically due to an α-helix
2180 2 × stretch C=O and peptide mode group
2050 N-H combination from protein
1947 O-H stretch and deformation from water
1738 CONH2 specifically due to an α-helix
1470-1490 N-H