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

Heritage Science

Table 3 List of the theoretical Raman shifts of collagen in parchment compared with those obtained for the unaged parchment used in the accelerated ageing experiments, and their relative vibrational modes

Raman shifts and ranges (cm⁻¹) Literature [54,55,56,57]	Raman shift (cm⁻¹) of unaged parchment	Vibrational mode
3030	3030	ν (CH) olefinic
1660–1670	1660	ν (C=O) Amide I
1550	1448	δ (CH₂)
1230–1260	1233	Amide III
800–1000	800–1000	C–C stretching of Pro/Hypro ring C–C stretching of protein backbone