Table 2. Effect of Solvent and Soxhlet Extractives on Lignin Extraction Systems A, B, and C.

entry	system	Soxhleta	biomass/solvent (g/mL)	isolated lignin (% yield)b
1	A	N	1/10	30
2	A	Y	1/10	27
3	A	N	1/20	30
4	A	Y	1/20	23
5c	A	N	1/10	27
6	Bd	N	1/10	34
7	Bd	N	1/20	43
8	Be	N	1/10	35
9	Be	N	1/20	48
10	C,170 °C	N	1/10	67
11	C,170 °C	N	1/20	65

^aWS pretreated with Soxhlet extraction in ethanol and water for 24 h each.

^bBased on theoretical ASL of 37 wt % of dry WS biomass.

^cReaction under an N₂ atmosphere.

^dEtOH.

^eMeOH.