Multivariate statistical analysis on Japanese traditional papers, washi, for evaluation of DNA presence and quality

Heritage Science

Table 3 Characteristic of peaks in the ATR-FTIR spectra, including according to literature data

Peak number	Absorption range	Interpretation	Assignment	References
1	3286–3321	Cellulose	O–H intermolecular bonds	[48, 49]
2	2898–2902	Cellulose and Hemicellulose	aliphatic C–H stretching	[50, 51, 64]
3	1628–1638	Lignin or Cellulose	O–H absorption, COO– Stretching	[34, 52]
4	1599	Lignin and Flavone	Aromatic skeletal or ring vibration	[30, 53]
5	1418	Starch, Lignin, Cellulose	CH₂ scissoring	[49, 54]
6	1315–1316	Xyloglucan, Cellulose I and II	CH₂ symmetric bending, CH₂ rocking vibration, CH₂ wagging	[48, 54,55,56]
7	1020–1030	Cellulose I and II, Polysaccharide, Lignin	C–O stretching, C–O deformation	[30, 34, 48, 57]
8	992	Lignin	C–O valence vibration	[49, 55]
9	874	Pinene (Terpene)	Terminal methylene group absorption	[58]