In-depth studies on the modifying effects of natural ageing on the chemical structure of European spruce (Picea abies) and silver fir (Abies alba) woods

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 2 Main bands in FT-IR spectra of the studied wood samples

Spruce		Fir
Wave number (cm⁻¹)	Assignments and remarks	Wave number (cm⁻¹)	Assignments and remarks
3329	OH str	3343	OH str
2933	CH str	1733	C=O xylan, hemicellulose
2915	CH str	1603	C=C arom. lignin
1733	C=O xylan, hemicellulose	1507	C=C arom. lignin
1604	C=C arom. lignin	1420	CH2 bend. cellulose (cryst 1, amorph)
1423	CH2 bend. cellulose (cryst 1, amorph)	1369	CH bend. cellulose
1369	CH bend. cellulose	1335	OH i.p.bend., CH cellulose, CO syringyl derivatives
1335	OH i.p.bend., CH cellulose, CO syringyl derivatives	1263,1398	CO str., lignin, hemicellulose, guaiacyl ring
1265	CO str., lignin, hemicellulose, guaiacyl ring	1231	syringyl ring vibr
1232	syringyl ring vibr	1157	COC as. bridge, O str. cellulose, lignin, xylan
1156	COC as. bridge, O str. cellulose, lignin, xylan	1030	CO cellulose, hemicellulose
1027	CO cellulose, hemicellulose	897	as. o.o.ph. ring str. in cellulose
898	as. o.o.ph. ring str. in cellulose