Table 1.

Characteristics of different types of lignocellulosic biomass after high-pressure pretreatment

Pretreatment conditions	Type of biomass	Type of solvent used for the pretreatment	Biomass extractives (%)	Lignocellulose composition (% DW)			Biomass crystallinity (%)	Hydrolysis susceptibility of biomass* [mg/g DW]	Hydrolysis yield* [%]
				Cellulose	Hemicellulose	Lignin
156 PSI, 60 min., 600 W	Pine chips	H2O	28.68 a ± 1.54	57.05 a ± 0.15	4.65 ac ± 1.40	36.00 a ± 0.00	55.93	96.31 a ± 1.25	15.20 a ± 0.20
		40% w/v NaCS	46.37 b ± 0.05	72.81 b ± 0.18	2.33 b ± 0.76	22.74 b ± 0.04	66.26	152.47 b ± 0.78	18.85 b ± 0.10
		1% w/v NaOH	39.44 c ± 3.42	65.47 c ± 0.03	3.43 bc ± 1.06	28.64 c ± 0.54	69.03	115.38 c ± 2.13	15.86 a ± 0.29
		60% v/v EtOH + 1% v/v H2SO4	44.75 bc ± 3.81	72.11 b ± 0.31	2.56 b ± 0.64	21.54 d ± 0.14	66.77	244.69 d ± 3.88	30.54 c ± 0.49
	Beech chips	H2O	31.32 a ± 0.01	66.00 c ± 0.90	4.86 ac ± 1.25	16.65 e ± 0.35	65.96	352.07 e ± 0.44	48.01 d ± 0.06
		40% w/v NaCS	54.59 d ± 1.04	88.46 d ± 0.36	2.02 b ± 0.80	6.15 f ± 0.35	72.93	533.97 f ± 4.47	54.33 e ± 0.45
		1% w/v NaOH	47.34 b ± 2.30	83.00 e ± 0.40	4.47 ac ± 0.35	6.65 f ± 0.35	73.24	573.61 g ± 5.66	62.21 f ± 0.62
		60% v/v EtOH + 1% v/v H2SO4	59.51 d ± 2.24	84.02 e ± 0.50	2.43 b ± 0.35	7.09 f ± 0.10	70.64	530.56 f ± 4.69	56.84 g ± 0.50
	Wheat straw	H2O	42.47 bc ± 1.25	62.45 f ± 0.35	6.86 d ± 0.55	20.05 g ± 0.05	60.98	455.01 h ± 0.88	65.58 h ± 0.13
		40% w/v NaCS	58.14 d ± 1.67	86.40 g ± 0.10	4.30 ac ± 0.66	4.00 h ± 0.10	66.10	682.85 i ± 9.29	71.14 i 0.97
		1% w/v NaOH	56.32 d ± 1.18	83.36 e ± 0.54	5.34 d ± 0.64	1.60 i ± 0.10	68.58	1.48 j ± 0.22	0.16 j ± 0.02
		60% v/v EtOH + 1% v/v H2SO4	47.93 b ± 1.00	76.65 h ± 0.95	5.56 d ± 0.35	4.40 h ± 0.60	64.24	530.88 f ± 1.13	62.34 f ± 0.13

^*after 72 h of hydrolysis under the following conditions: pH 5.5, 16 FPU/g DW, 160 g DW/L. The mean values given in columns within the table with different letter indices are significantly different (α < 0.05). DW dry weight