Plant residue	Lignin weight before treatment (g)	Time (hours)	Lignin weight after treatment (g)	Lignin removal (%)^*
Sugarcane bagasse	0.108 ± 0.015	4	0.070 ± 0.004	35.040^a
		12	0.069 ± 0.004	35.680^a
		72	0.067 ± 0.004	37.810^a
Coconut shell	0.227 ± 0.014	4	0.137 ± 0.008	39.610^b
		12	0.137 ± 0.008	39.452^b
		72	0.166 ± 0.010	40.201^b
Sisal fiber	0.054 ± 0.007	4	0.021 ± 0.003	63.040^c
		12	0.023 ± 0.003	63.140^c
		72	0.020 ± 0.003	63.150^c