Table 4.

³¹P NMR quantitative analysis of lignin fractions from ethanol organosolv-pretreated wood sawdust (mmol/g lignin)

Lignin	Aliphatic OH	Phenolic OH			Carboxylic OH
		Condensed	Non-condensed	Total
MWL-25	2.80	0.77	1.27	2.04	0.75
MWL-50	3.32	0.61	1.23	1.85	0.36
EL-25	1.78	1.03	1.73	2.76	0.42
EL-50	2.10	0.92	1.66	2.58	0.30