Table 1: Absorbance and concentration of lignin in filtrate for 1 w/w% NaOH pretreatment.

t, min	Abs. at 80°C	Conc. at 80°C	Abs. at 90°C	Conc. at 90°C	Abs. at 100°C	Conc. at 100°C	Abs. at 110°C	Conc. at 110°C	Abs. at 120°C	Conc. at 120°C
0	0	0	0	0	0	0	0	0	0	0
30	0.14	0.28	0.24	0.49	0.30	0.61	0.41	0.81	0.75	1.50
60	0.26	0.53	0.55	1.09	0.73	1.46	1.10	2.2	1.49	2.99
90	0.56	1.12	0.97	1.94	1.32	2.64	2.44	4.88	2.53	5.07