Table 5.

Band assignments for Raman spectra of H-Gly-Hyp-Pro-Ala-Hyp-Pro-OH [63,64,65,66,67].

Peak Position (cm−1)	Proposed Band Assignment	Proposed Residue
1740	C=O stretch	Pro/Hyp
1662	Amide I (C=O stretch)	–
1613	C=O asymmetric stretch	Pro/Hyp
1451	CH2 scissor or CH2 bend	Pro/Gly
1344	C-H bend or CH2 twist	Pro/Hyp
1307	COH bend	Pro
1269	Amide III (C-N stretch and N-H bend)	–
1243	C-O stretch	Pro/Hyp
1197	NH+ deformation	Pro
1105	C-C stretch	Ala
1057	C-N stretch	Pro
976	C-C-N stretch	Pro/Hyp
917	C-COO− stretch	Pro/Hyp/Ala
880	NH2+ rock, N-H bend	Pro/Hyp
836	C-C stretch	Pro/Hyp
818	C-C stretch	Pro/Hyp
742	–	Pro
724	COO- deformation	Backbone
339	CCN bend	Pro/Hyp
266	skeletal deformations	–
192	CCC bend	–
142	CCC bend	–