Changes on structural properties of biomass pretreated by combined deacetylation with liquid hot water and its effect on enzymatic hydrolysis

Jiang, Wei; Chang, Senlin; Qu, Yanbin; Zhang, Zhiguo; Xu, Jian

doi:10.1016/j.biortech.2016.08.087

Cited by 25 publications

(9 citation statements)

References 37 publications

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“…Biomass porosity including BET specific surface area, Barrett–Joyner–Halenda (BJH) pore diameter, and pore volume was investigated for analyzing the biomass permeability for enzymes to access . The surface area significantly increased after SP and LHW-SP treatment (Table ) due to hemicellulose components removal . In comparison to the undeacetylated samples (SP and LHW-SP), the pore volume and specific surface area of DEA-SP-treated samples further increased, in which the DEA(Na 2 CO 3 + Na 2 S)-SP substrate showed the highest biomass porosity (Table and Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…49 The surface area significantly increased after SP and LHW-SP treatment (Table 3) due to hemicellulose components removal. 20 In comparison to the undeacetylated samples (SP and LHW-SP), the pore volume and specific surface area of DEA-SP-treated samples further increased, in which the DEA(Na 2 CO 3 + Na 2 S)-SP substrate showed the highest biomass porosity (Table 3 and Figure 3). These results were mainly attributed to the facts that strong nucleophiles like HS − in alkali media could solubilize the macromolecular hemicellulose while degrading lignin, which led to the internal destruction of lignocellulosic matrix.…”

Section: ■ Materials and Methodsmentioning

confidence: 94%

“…(3) the partial removal of lignin and ash in deacetylation plays a role in increasing the biomass-specific surface area or introducing the substantial nanoscale porosity to biomass, 13,17,19 thus promoting the cellulose accessibility; 20,21 (4) deacetylation decreases the formation of acetic acid in pretreatment, 14 which reduces the generation of pseudolignin and lignin droplets on the fiber surface. 17,20 Based on these advantages, significantly improved biomass saccharification could be anticipated after deacetylation−steam pretreatment and subsequent enzymatic hydrolysis for efficient bioethanol production from lignocellulosic biomass. 22 In addition to the above insights, the structure and nature of lignin also have a considerable influence on the effectiveness of enzymatic hydrolysis.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The reasons for the improved biomass saccharification by deacetylation have been previously investigated. It is shown that: (1) deacetylation decreases the degradation of hemicellulose and the formation of inhibitors, − thus imposing less inhibition on cellulose hydrolysis; (2) deacetylation enhances the susceptibility of xylan to enzymatic degradation, ,, which could reduce biomass recalcitrance; (3) the partial removal of lignin and ash in deacetylation plays a role in increasing the biomass-specific surface area or introducing the substantial nanoscale porosity to biomass, ,, thus promoting the cellulose accessibility; , (4) deacetylation decreases the formation of acetic acid in pretreatment, which reduces the generation of pseudolignin and lignin droplets on the fiber surface. , Based on these advantages, significantly improved biomass saccharification could be anticipated after deacetylation–steam pretreatment and subsequent enzymatic hydrolysis for efficient bioethanol production from lignocellulosic biomass …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improving Enzymatic Saccharification and Ethanol Production from Hardwood by Deacetylation and Steam Pretreatment: Insight into Mitigating Lignin Inhibition

Chu

Wang

Tong

et al. 2020

ACS Sustainable Chem. Eng.

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Lignin component in lignocellulosic biomass always adversely affects the efficiency of its enzymatic saccharification and subsequent bioethanol production. To mitigate the lignin inhibition, this work thoroughly evaluated the effectiveness of deacetylation and steam pretreatment for improved fermentable sugars and bioethanol production from hardwood as well as quantified the relative contribution of lignin toward physical blockage effect and unproductive adsorption effect on cellulose hydrolysis. It was found that deacetylation reduced the formation of acid catalyst, thus significantly mitigating lignin inhibition on cellulose hydrolysis. The addition of Na2S in deacetylation was more liable in improving biomass porosity, and the addition of Na2SO3 was more favorable for removing surface lignin; both of these factors contributed to the decreased physical blockage effect of lignin. Besides, X-ray photoelectron spectroscopy (XPS) results indicated that deacetylation distinctly suppressed the undesirable lignin repolymerization and the formation of phenolic hydroxyl groups, which could alleviate the unproductive adsorption effect of lignin. When lignin was isolated from the deacetylation–steam-pretreated substrates and added to the enzymatic hydrolysis of Avicel, a distinctly lower lignin inhibition was observed compared to the samples without deacetylation. Besides, the lignin inhibition showed a strong correlation with the extent of lignin repolymerization, proving the lignin inhibition mitigating effect of deacetylation through modification of the lignin structure.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 94%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving Enzymatic Saccharification and Ethanol Production from Hardwood by Deacetylation and Steam Pretreatment: Insight into Mitigating Lignin Inhibition

Chu

Wang

Tong

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…We found that the Miscanthus macromolecular structure was degraded after irradiation treatment [23]. These structural changes in biomass are helpful for enzymatic hydrolysis [24]. Table 3 shows that the CrI values of irradiated samples showed a dose-dependent decreasing tendency, which also improved the enzymatic hydrolysis efficiency.…”

Section: Dp Cri and Molecular Weight Distributionmentioning

confidence: 86%

Radiation-Induced Structural Changes of Miscanthus Biomass

Zhang

et al. 2020

Applied Sciences

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Efficient pretreatment is a prerequisite for lignocellulosic biomass biorefinery due to the structure of lignocellulose. This study is a first-time investigation into the structural changes of Miscanthus biomass treated with 60Co γ-ray irradiation in different doses up to 1200 kGy. The structural properties of the treated sample have been systematically characterized by FTIR, thermogravimetric analysis (TGA), XRD, gel permeation chromatography (GPC), a laser particle size analyzer, SEM, an atomic force microscope (AFM), and NMR. The results show that irradiation treatment can partially destroy the intra- or inter-molecular hydrogen bonds of biomass. Irradiation treatment can also reduce particle size, narrow the distribution range, as well as increase the specific surface area of biomasses. Noticeably, the TGA stability of the treated biomass decreases with increasing absorbed doses. To respond to these structural changes, the treated biomass can be easily hydrolyzed by cellulases with a high yield of reducing sugars (557.58 mg/g biomass), much higher than that of the untreated sample. We conclude that irradiation treatment can damage biomass structure, a promising strategy for biomass biorefinery in the future.

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Factors Affecting Seawater-Based Pretreatment of Lignocellulosic Date Palm Residues

et al. 2019

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Changes on structural properties of biomass pretreated by combined deacetylation with liquid hot water and its effect on enzymatic hydrolysis

Cited by 25 publications

References 37 publications

Improving Enzymatic Saccharification and Ethanol Production from Hardwood by Deacetylation and Steam Pretreatment: Insight into Mitigating Lignin Inhibition

Improving Enzymatic Saccharification and Ethanol Production from Hardwood by Deacetylation and Steam Pretreatment: Insight into Mitigating Lignin Inhibition

Radiation-Induced Structural Changes of Miscanthus Biomass

Factors Affecting Seawater-Based Pretreatment of Lignocellulosic Date Palm Residues

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