Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table method

Heritage Science

Table 1 List of the theoretical FTIR-ATR peak shift ranges of Amide I, Amide II, Amide III, and carbonyl/carboxyl compounds compared with the absorption maximums for the unaged parchment used in the experiments, and their relative vibrational modes

Peak shift ranges (cm⁻¹) Literature [39,40,41,42,43]	Absorption peak frequency (cm⁻¹) of unaged parchment	Vibrational mode
1600–1700	1635	Amide I (AI)
1500–1600	1552	Amide II (AII)
1200–1300	1239	Amide III (AIII)
1720–1750	1740	(C=O)