Table 5: Absorbance and concentration of lignin in filtrate for 3 w/w% NaOH pretreatment.

Time	Absor- bance	Concen- tration (mg/mL)	Absor- bance	Concen- tration (mg/mL)	Absorb- ance	Concen- tration (mg/mL)	Absorb- ance	Concen- tration (mg/mL)	Absorb- Ance	Concen- Tration (mg/mL)
(mins)	(80°C)	(80°C)	(90°C)	(90°C)	(100°C)	(100°C)	(110°C)	(110°C)	(120°C)	(120°C)
0	0	0	0	0	0	0	0	0	0	0
30	0.216	0.432	0.307	0.61	0.413	0.826	0.505	1.01	0.889	1.778
60	0.361	0.722	0.63	1.26	0.859	1.718	1.223	2.446	1.689	3.378
90	0.779	1.558	1.105	2.21	1.438	2.876	2.541	5.082	2.884	5.768