Table 2.

The main absorption bands in each ATR-FTIR spectrum of hemp shive samples in powder form and their assignment to chemical group vibrations and components.

Wavenumber (cm−1)					Vibration Modes	Assigned Components
SHI-R	SHI-W	SHI-OH	SHI-C	SHI-H
3348	3354	3312, 3338	3351	3354	OH stretching	water, cellulose, hemicelluloses
2903	2902	2901	2908	2903	C–H symmetrical stretching	cellulose, hemicelluloses
1734	1734		1733	1733	C=O stretching vibration C=O unconjugated stretching	pectin, fatty acids hemicelluloses
1594, 1652	1628, 1651	1593, 1628	1594, 1653	1593, 1641	OH (water) OH bending of absorbed water aromatic skeletal vibrations	water cellulose lignin
1506	1507	1507	1504	1505	C=C aromatic symmetrical stretching	lignin
1422	1423, 1456	1422, 1459	1420, 1456	1422, 1456	HCH and OCH in-plane bending vibration CH2 symmetric bending C=C stretching in aromatic groups	cellulose, hemicelluloses pectin, lignin
1373	1372	1370	1370	1371	in-plane symmetric vibration of –CH3	lignin
1327	1322	1323	1327	1328	in-plane bending vibrations of O-H C-O stretching	cellulose
1236	1234	1228, 1264	1232	1234	symmetric stretching of C-O of aryl groups	lignin
1157	1157	1156	1156	1156	C-O-C asymmetrical stretching	cellulose, hemicelluloses
1035, 1047	1034	1028	1033	1033	C-C, C-OH, C-H ring and side group vibrations	cellulose, hemicelluloses
899	897	896	896	898	glycosidic bond symmetric ring-stretching mode	polysaccharides