Table 1.

Functional groups and molecular weight of the lignin samples

Lignin	Ph-OH	Al-OH	MeO	Mw	Mn	Mw/Mn
	mmol/g	mmol/g	mmol/g
HEL	2.76	2.88	6.16	2600	1600	1.62
HKL	4.29	4.12	5.81	2400	1330	1.80

Note: HEL, hardwood ethanol organosolv lignin; HKL, hardwood kraft lignin; Ph-OH, phenolic hydroxyl group; Al-OH, aliphatic hydroxyl group; MeO, methoxyl group; M_w, weight average molecular weight; M_n, number average molecular weight.