Alkaline post-incubation improves the saccharification of poplar after hydrogen peroxide–acetic acid pretreatment

Table 3 Chemical compositions of poplar after HPAA–sodium hydroxide (HPAA–SH) process, expressed as percentage of dry matter

Pretreatment label	Glucan (%)	Xylan (%)	Lignin (%)	Acetyl (%)	Solid recovery (%)	Removal
Pretreatment label	Glucan (%)	Xylan (%)	Lignin (%)	Acetyl (%)	Solid recovery (%)	Glucan (%)	Xylan (%)	Lignin (%)	Acetyl (%)
HPAA₄₀–SH_0.1	52.0 ± 0.9	17.8 ± 0.4	19.7 ± 0.1	4.8 ± 0.2	87.7	4.0	0.2	34.8	16.8
HPAA₆₀–SH_0.1	56.3 ± 0.2	18.9 ± 0.3	16.8 ± 0.1	5.3 ± 0.2	92.0	5.8	4.1	22.1	15.6
HPAA₈₀–SH_0.1	68.0 ± 0.5	20.0 ± 0.3	4.1 ± 0.0	5.2 ± 0.1	89.5	4.5	10.5	52.5	15.6
HPAA₁₀₀–SH_0.1	71.9 ± 0.6	18.4 ± 0.4	1.9 ± 0.0	4.3 ± 0.3	85.3	13.4	19.4	64.5	37.8
HPAA₄₀–SH_1.0	56.1 ± 0.1	18.4 ± 0.0	18.8 ± 0.2	0.5 ± 0.0	79.8	5.7	6.4	43.6	92.1
HPAA₆₀–SH_1.0	68.2 ± 0.4	20.1 ± 0.2	6.1 ± 0.0	0.5 ± 0.0	76.2	5.5	15.4	76.7	93.9
HPAA₈₀–SH_1.0	76.7 ± 2.5	20.0 ± 0.2	1.4 ± 0.0	0.4 ± 0.0	77.5	6.7	22.4	85.4	94.7
HPAA₁₀₀–SH_1.0	80.5 ± 2.6	17.7 ± 0.8	0.2 ± 0.0	0.4 ± 0.0	75.7	14.0	31.5	96.5	95.0

In HPAA–SH process, HPAA pretreatment conditions were 40%–100% HPAA (v/v) at 60 °C for 2 h and alkaline post-incubation conditions were 0.1% and 1.0% sodium hydroxide at 50 °C for 1 h. The removal of HPAA–SH-pretreated poplar was based on the HPAA-pretreated poplar

ISSN: 2731-3654