Table 4.

The IR wavenumbers of functional groups in polysaccharides.

Functional group	Vibration mode	Wavenumbers/cm−1
-OH	O-H, ν (stretching vibration)	3,700–3,100
	O-H, δ (scissoring vibration)	1,075–1,010; 1,120–1,105
-COOH	C=O	1,740–1,680
	C-O	1,440–1,395
	O-H	1,320–1,210
-O-COR	C=O	1,749–1,725
	C-O	1,245
-NH2	N-H, ν	3,450–3,380
	N-H, δ	1,650–1,500
=NH	N-H, ν	3,460–3,420
-NH+ 3	N=H	3,350–3,150
	N-H	1,650–1,550
-C-O-C	C-O (fatty ether)	1,150–1,060
	C-O (cyclic ether)	1,150–1,080
-CH2	C-H, ν	2,926–2,853
	C-H, δ	1,465
-CH3	C-H, ν	2,962; 2,872
-C=O -CHO	C=O	1,780–1,540
	C=O	1,740, 1,650
α-D-Glcp	C-H	855–833
β-D-Glcp		905–876
α-D-Galp		839–810
β-D-Galp		914–886
α-D-Manp		843–818
β-D-Manp		898–888
α-D-Xylp		760–740
β-D-Arbp		855–830