Table 2.

Structural characterization of the different lignin fractions by ³¹P-NMR.

	Aliphatic OH	Phenolic OH	COOH	Mw	Mn	Ɖ
Lignin	(mmol/g)	(mmol/g)	(mmol/g)	(Da)	(Da)	Mw/Mn
Beechwood	2.32	4.09	0.10	2210	1010	2.19
Beechwood_HL	2.32	5.01	0.09	1590	874	1.82
Wheat straw	2.31	1.51	0.71	3200	1050	3.0
Wheat straw_HL	1.94	2.87	0.31	1510	744	2.03
Wheat straw_HL_Et2O_soluble	1.41	2.28	0.23	593	438	1.35
Wheat straw_HL_Et2O_residue	2.31	2.93	0.20	1920	1000	1.92