Structure and distribution changes of Eucalyptus hemicelluloses during hydrothermal and alkaline pretreatments

Wang, Chenzhou; Yang, Jiyou; Wen, Jingyun; Bian, Jing; Li, Mingfei; Peng, Feng; Sun, Run‐Cang

doi:10.1016/j.ijbiomac.2019.04.127

Cited by 46 publications

(15 citation statements)

References 31 publications

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“…A slight increase at 1421 and 892 cm −1 bands which represents -CH 2 shear vibration and β-D-glucoside in cellulose, respectively, indicating a slight increase of the crystallinity of cellulose, and additionally a slight increase of crystalline (1370 cm −1 ) and amorphous (2898 cm −1 ) regions of cellulose. The C-O bending vibration at 1273 cm −1 in lignin and the slight increase of the characteristic band of aromatic ring at 1594 and 1504 cm −1 suggested that part of lignin was released and coprecipitated [44]. The lignin precipitation effect was especially obvious than other samples.…”

Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 94%

“…Figure 1 shows the FTIR spectra of pretreated eucalyptus and raw eucalyptus chips. Stretching vibration in the spectra could be assigned to different groups of lignocellulose components: 1594, 1504 and 1273 cm −1 to lignin, 1421, 1319, 1229 and 1106 cm −1 to lignin and carbohydrates, and 3350, 2898, 1735, 1370, 1056 1026, and 892 cm −1 to carbohydrates [24,28,43,44]. The peaks at 1735 and 1229 cm −1 are related to the C=O stretching vibration and C-O stretching vibration in hemicellulose.…”

Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 96%

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Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

et al. 2020

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Pretreatment is an essential process for the extensive utilization of lignocellulose materials. The effect of four common organic acid pretreatments for Kraft dissolving pulp production was comparatively investigated. It was found that under acidic conditions, hemicellulose can be effectively removed and more reducing sugars can be recovered. During acetic acid pretreatment, lignin that was dissolved in acetic acid could form a lignin-related film which would alleviate cellulose hydrolysis, while other organic acids caused severe cellulose degradation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were used to characterize the pretreated chips in the process. Lignin droplets were attached to the surface of the treated wood chips according to the SEM results. The FTIR spectrum showed that the lignin peak signal becomes stronger, and the hemicellulose peak signal becomes weaker with acid pretreatment. The XRD spectrum demonstrated that the crystallinity index of the wood chips increased. The acetic acid pretreatment process-assisted Kraft process achieved higher yield (31.66%) and higher α-cellulose (98.28%) than any other organic acid pretreatment. Furthermore, extensive utilization of biomass was evaluated with the acetic acid pretreatment-assisted Kraft process. 43.8% polysaccharide (12.14% reducing sugar and 31.66% dissolving pulp) and 22.24% lignin (0.29% acetic acid lignin and 21.95% sulfate lignin) were recovered during the process. Biomass utilization could reach 66.04%. Acetic acid pretreatment is a promising process for extensive biomass utilization.

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Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 94%

Section: Analysis Of Solid and Hydrolysate After Different Pretreatmentmentioning

confidence: 96%

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

et al. 2020

View full text Add to dashboard Cite

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“…General experience shows that treatment with ionic liquids causes both carbohydrates and lignin to be soluble but not degraded (Ramli & Amin, 2020). Another possibility for chemical pre-treatment is the use of organic solvents; in this case, an organic solvent is used in the presence of an inorganic acid catalyst to break down the bonds between hemicelluloses and lignin to bring the lignin into solution (Wang et al, 2020a). The structure of lignin and the linkages between lignin and hemicellulose and cellulose can be broken by acetyl group removal as well, and the successive enzymatic hydrolysis of cellulose can be enhanced (Huang et al, 2019a).…”

Section: Mechanical Physico-chemical and Biotechnological Modificatimentioning

confidence: 99%

An overview of biomass conversion: exploring new opportunities

Fülöp¹,

Ecker²

2020

PeerJ

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Recycling biomass is indispensable these days not only because fossil energy sources are gradually depleted, but also because pollution of the environment, caused by the increasing use of energy, must be reduced. This article intends to overview the results of plant biomass processing methods that are currently in use. Our aim was also to review published methods that are not currently in use. It is intended to explore the possibilities of new methods and enzymes to be used in biomass recycling. The results of this overview are perplexing in almost every area. Advances have been made in the pre-treatment of biomass and in the diversity and applications of the enzymes utilized. Based on molecular modeling, very little progress has been made in the modification of existing enzymes for altered function and adaptation for the environmental conditions during the processing of biomass. There are hardly any publications in which molecular modeling techniques are used to improve enzyme function and to adapt enzymes to various environmental conditions. Our view is that using modern computational, biochemical, and biotechnological methods would enable the purposeful design of enzymes that are more efficient and suitable for biomass processing.

show abstract

“…General experience shows that treatment with ionic liquids causes both carbohydrates and lignin to be soluble but not degraded (Ramli & Amin, 2020). Another possibility for chemical pre-treatment is the use of organic solvents; in this case, an organic solvent is used in the presence of an inorganic acid catalyst to break down the bonds between hemicelluloses and lignin to bring the lignin into solution (Wang C. et al, 2020). The structure of lignin and the linkages between lignin and hemicellulose and cellulose can be broken by acetyl group removal as well, and the successive enzymatic hydrolysis of cellulose can be enhanced (Huang J. et al, 2019).…”

Section: Mechanical Physico-chemical and Biotechnological Modificatimentioning

confidence: 99%

Peer Review #2 of "An overview of biomass conversion: exploring new opportunities (v0.2)"

2020

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Recycling biomass is indispensable these days not only because fossil energy sources are gradually depleted, but also because pollution of the environment, caused by the increasing use of energy, must be reduced. This paper intends to overview the results of plant biomass processing methods that are currently in use. Our aim was also to review published methods that are not currently in use. It is intended to explore the possibilities of new methods and enzymes to be used in biomass recycling. The results of this overview are perplexing in almost every area. Advances have been made in the pre-treatment of biomass and in the diversity and applications of the enzymes utilized. Based on molecular modeling, very little progress has been made in the modification of existing enzymes for altered function and adaptation for the environmental conditions during the processing of biomass. There are hardly any publications in which molecular modeling techniques are used to improve enzyme function and to adapt enzymes to various environmental conditions. Our view is that using modern computational, biochemical, and biotechnological methods would enable the purposeful design of enzymes that are more efficient and suitable for biomass processing.

show abstract

Structure and distribution changes of Eucalyptus hemicelluloses during hydrothermal and alkaline pretreatments

Cited by 46 publications

References 31 publications

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

An overview of biomass conversion: exploring new opportunities

Peer Review #2 of "An overview of biomass conversion: exploring new opportunities (v0.2)"

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