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1. A microwave-assisted aqueous ionic liquid pretreatment to enhance enzymatic hydrolysis of Eucalyptus and its mechanism

Author:
Hou, Xianfeng; Wang, Zhinan; Sun, Jin; Li, Meng; Wang, Shujie; Chen, Kai; Gao, Zhenzhong
Source:
Bioresource technology 2019 v.272 pp. 99-104
ISSN:
0960-8524
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus; Fourier transform infrared spectroscopy; X-ray diffraction; biorefining; carbon; chemical composition; hemicellulose; ionic liquids; lignin; microwave treatment; nuclear magnetic resonance spectroscopy; sawdust; scanning electron microscopes; scanning electron microscopy; stable isotopes; sugars;     Show all 17 Subjects
Abstract:
... A novel pretreatment strategy based on combination of microwave and ionic liquid [TBA][OH] was developed for enhancing enzymatic hydrolysis of Eucalyptus sawdust. The sugar yield of pretreated sample achieved 410.67 mg/g in 48 h, which suffered from optimized microwave-assisted [TBA][OH] pretreatment. The work mechanism was illuminated by chemical composition, Fourier transform infrared spectrosco ...
DOI:
10.1016/j.biortech.2018.10.003

2. Improving enzymatic saccharification of Eucalyptus grandis branches by ozone pretreatment

Author:
Andersen, Silvia Layara Floriani; Castoldi, Rafael; Garcia, Jessica A. A.; Bracht, Adelar; Peralta, Rosely A.; de Lima, Edson Alves; Helm, Cristiane Vieira; Moreira, Regina de Fátima Peralta Muniz; Peralta, Rosane Marina
Source:
Wood science and technology 2019 v.53 no.1 pp. 49-69
ISSN:
0043-7719
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus grandis; biomass; branches; cellulose; hemicellulose; lignin; lignin content; lignocellulose; ozone; ozonolysis; saccharification; sawdust; sugars; trees; Brazil;     Show all 16 Subjects
Abstract:
... Ozonolysis is potentially an effective method for pretreating lignocellulosic biomass to improve the production of fermentable sugars via enzymatic hydrolysis. The eliminated branches from eucalyptus trees can represent a production of around 30 million m³ of lignocellulosic material annually only in Brazil. Attempts of developing strategies for a rational use of this biomass are, thus, welcome. I ...
DOI:
10.1007/s00226-018-1061-7

3. Facile fractionation of lignocelluloses by biomass-derived deep eutectic solvent (DES) pretreatment for cellulose enzymatic hydrolysis and lignin valorization

Author:
Shen, Xiao-Jun; Wen, Jia-Long; Mei, Qing-Qing; Chen, Xue; Sun, Dan; Yuan, Tong-Qi; Sun, Run-Cang
Source:
Green chemistry 2019 v.21 no.2 pp. 275-283
ISSN:
1463-9270
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus; biomass; biorefining; cellulose; chemical structure; choline; delignification; fractionation; glucose; green chemistry; hemicellulose; income; lactic acid; lignin; lignocellulose; molecular weight; recycling; saccharification; solvents; temperature;     Show all 21 Subjects
Abstract:
... A low-cost and green biorefinery will increase the economy and revenue from lignocellulosic biomass. Herein, a biomass-derived deep eutectic solvent (DES) pretreatment was developed to deconstruct the recalcitrant structure of Eucalyptus for further cellulose enzymatic hydrolysis and lignin valorization. The DES consisted of biomass-derived chemicals (lactic acid and choline chloride). The results ...
DOI:
10.1039/c8gc03064b

4. Bioethanol production from bamboo with alkali-catalyzed liquid hot water pretreatment

Author:
Yang, Haiyan; Shi, Zhengjun; Xu, Gaofeng; Qin, Yongjian; Deng, Jia; Yang, Jing
Source:
Bioresource technology 2019 v.274 pp. 261-266
ISSN:
0960-8524
Subject:
enzymatic hydrolysis,   etc   ; bamboos; bioethanol; biotransformation; cell walls; chemical composition; ethanol; ethanol production; fermentation; gel chromatography; hemicellulose; lignin; liquids; molecular weight; sodium hydroxide; surface area; temperature;     Show all 17 Subjects
Abstract:
... Altering recalcitrant structures of bamboo is essential to obtain high yield of bioethanol via bioconversion process. With the goal of improving cell wall digestibility, alkaline liquid hot water was used to pretreat N. affinis. The effects of temperature and alkali dosage on structural alterations were determined by chemical composition, Brunauer Emmett Teller (BET) and gel permeation chromatogra ...
DOI:
10.1016/j.biortech.2018.11.088

5. Delignification overmatches hemicellulose removal for improving hydrolysis of wheat straw using the enzyme cocktail from Aspergillus niger

Author:
Wang, Jiahong; Chen, Xuntong; Chio, Chonlong; Yang, Chun; Su, Erzheng; Jin, Yongcan; Cao, Fuliang; Qin, Wensheng
Source:
Bioresource technology 2019 v.274 pp. 459-467
ISSN:
0960-8524
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Aspergillus niger; biomass; crystal structure; delignification; enzyme activity; feedstocks; hemicellulose; industry; reducing sugars; wheat straw; xylanases;     Show all 13 Subjects
Abstract:
... Based on a general understanding that hemicellulose removal is more efficient than delignification for biomass deconstruction, an Aspergillus niger strain producing high xylanase activity was screened out from seventeen strains by clear halo experiments. Low-cost enzyme cocktail with high xylanase activity was produced from wheat straw medium fermented by the Gyx086 strain. The enzyme cocktail wit ...
DOI:
10.1016/j.biortech.2018.12.029

6. Fractionation and Biotransformation of Lignocelluloses-Based Wastes for Bioethanol, Xylose and Vanillin Production

Author:
Messaoudi, Yosra; Smichi, Neila; Bouachir, Faouzi; Gargouri, Mohamed
Source:
Waste and biomass valorization 2019 v.10 no.2 pp. 357-367
ISSN:
1877-2641
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus; Fourier transform infrared spectroscopy; Pinus halepensis; almond shells; bioethanol; biotransformation; cellulose; esters; ethanol; fractionation; fronds; glucose; hemicellulose; ketones; lignin; lignocellulose; moieties; saccharification; seed cones; vanillin; wastes; white-rot fungi; xylose;     Show all 24 Subjects
Abstract:
... In this study combined NaOH/H₂SO₄ pretreatment of lignocellulosic biomasses (palm fronds, eucalyptus chips, almond shells and Aleppo pine cones) were used to separate hemicellulose and lignin and improve enzymatic digestibility of cellulose. The recovered celluloses were hydrolyzed using Cellic C-Tec2 or Cellic H-Tech2. The optimal saccharification yields 95.8, 94, 73.3 and 80.5% were obtained fro ...
DOI:
10.1007/s12649-017-0062-3

7. Synergy of hemicelluloses removal and bovine serum albumin blocking of lignin for enhanced enzymatic hydrolysis

Author:
Ding, Dayong; Li, Pengyun; Zhang, Xueming; Ramaswamy, Shri; Xu, Feng
Source:
Bioresource technology 2019 v.273 pp. 231-236
ISSN:
0960-8524
Subject:
enzymatic hydrolysis,   etc   ; Populus; adsorption; alkali treatment; biomass; biorefining; bovine serum albumin; cell walls; cellulose; cost effectiveness; delignification; endo-1,4-beta-glucanase; glucose; hemicellulose; lignin; sodium hydroxide;     Show all 16 Subjects
Abstract:
... A cost efficient synergistic strategy combining mild alkaline pretreatment (0.5–5% NaOH at 70 °C for 60 min) and bovine serum albumin (BSA) blocking of lignin was evaluated for effective conversion of poplar. The highest glucose yield of 69.2% was obtained for 5% alkaline pretreated sample, which was 4.4 times that of untreated sample. The enhanced enzymatic hydrolysis was attributed to significan ...
DOI:
10.1016/j.biortech.2018.11.024

8. Comparative study of hemicelluloses from Hybrid Pennisetum via a green and clean integrated process

Author:
Sun, Dan; Wang, Han-Min; Wang, Bing; Wen, Jia-Long; Li, Ming-Fei; Sun, Run-Cang
Source:
Carbohydrate polymers 2019 v.205 pp. 135-142
ISSN:
0144-8617
Subject:
enzymatic hydrolysis,   etc   ; Pennisetum; bioethanol; biorefining; drugs; glucose; hemicellulose; high performance liquid chromatography; microwave treatment; raw materials; value added; xylooligosaccharides;     Show all 12 Subjects
Abstract:
... In this study, a green and clean integrated process based on microwave-assisted hydrothermal pretreatment (MHTP) and subsequent alkali post-treatment was performed to isolate and characterize water- and alkali-soluble hemicelluloses (SHs and AHs) from Hybrid Pennisetum (HP) as well as to improve the enzymatic digestibility of HP. Meanwhile, part of hemicelluloses was degraded into the value-added ...
DOI:
10.1016/j.carbpol.2018.10.027

9. Hydrotropic pretreatment on wheat straw for efficient biobutanol production

Author:
Qi, Gaoxiang; Xiong, Lian; Li, Hailong; Huang, Qianlin; Luo, Mutan; Tian, Lanlan; Chen, Xuefang; Huang, Chao; Chen, Xinde
Source:
Biomass and bioenergy 2019 v.122 pp. 76-83
ISSN:
0961-9534
Subject:
enzymatic hydrolysis,   etc   ; biobutanol; butanol; fermentation; formic acid; fuel production; hemicellulose; hexoses; hydrolysates; lignocellulose; pH; pentoses; sodium; temperature; wheat straw; xylene;     Show all 16 Subjects
Abstract:
... Pretreatment is an important upstream process that affects the economics of biofuels production from lignocellulose. Hydrotropic reagent sodium xylene sulfonate (SXS) was used in this study to treat wheat straw for efficient butanol production. Effects of temperature, time, SXS concentration on pretreatment were evaluated. In addition, a modified SXS pretreatment method with pH adjusted to 3.5 by ...
DOI:
10.1016/j.biombioe.2019.01.039

10. Effects of hydrothermal treatment on enhancing enzymatic hydrolysis of rapeseed straw

Author:
Wang, Zhi-Wen; Zhu, Ming-Qiang; Li, Ming-Fei; Wei, Qin; Sun, Run-Cang
Source:
Renewable energy 2019 v.134 pp. 446-452
ISSN:
0960-1481
Subject:
enzymatic hydrolysis,   etc   ; byproducts; cellulose; cellulosic fibers; crystal structure; delignification; glucose; hemicellulose; hot water treatment; lignin; microstructure; rapeseed; renewable energy sources; saccharification; straw; temperature;     Show all 16 Subjects
Abstract:
... Rapeseed straw is an annually renewable low-cost crop by-product, and it was submitted to hydrothermal treatment at temperatures ranging from 145 to 205 °C for various retention times (15–120 min). The enzymatic hydrolysis was conducted at a substrate concentration of 2% and an enzyme addition of 115 mg/g substrate. Results showed that increased pretreatment severity gradually degraded and removed ...
DOI:
10.1016/j.renene.2018.11.019

11. Effects of outdoor dry bale storage conditions on corn stover and the subsequent biogas production from anaerobic digestion

Author:
Wang, Feng; Xu, Fuqing; Liu, Zhe; Cui, Zhifang; Li, Yebo
Source:
Renewable energy 2019 v.134 pp. 276-283
ISSN:
0960-1481
Subject:
enzymatic hydrolysis,   etc   ; anaerobic digestion; bioenergy; biomass; cellulose; chemical composition; corn stover; crop yield; economic analysis; gas production (biological); hemicellulose; life cycle assessment; lignin; logit analysis; methane production; particle size; storage conditions; stored grain;     Show all 18 Subjects
Abstract:
... Loss of energy potential during storage is a significant consideration when using crop residues for bioenergy production. However, previous studies about biomass storage only reported dry matter loss and composition change, but not the direct effects on bioenergy production. This study investigated the changes in chemical composition, enzymatic digestibility, and methane yield of corn stover after ...
DOI:
10.1016/j.renene.2018.10.093
CHORUS:
10.1016/j.renene.2018.10.093

12. Evaluating the efficiency of γ-valerolactone/water/acid system on Eucalyptus pretreatment by confocal Raman microscopy and enzymatic hydrolysis for bioethanol production

Author:
Li, Yi-Jing; Li, Han-Yin; Sun, Shao-Ni; Sun, Run-Cang
Source:
Renewable energy 2019 v.134 pp. 228-234
ISSN:
0960-1481
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus; Raman imaging; biomass; cell walls; cellulose; delignification; ethanol production; glucose; hemicellulose; lignin; raw materials; renewable energy sources; solvents; sulfuric acid;     Show all 15 Subjects
Abstract:
... γ-Valerolactone (GVL)/water/acid has been developed as a mild solvent system to pretreat biomass. In this study, Eucalyptus was pretreated with 80/20 GVL/water with the addition of H2SO4 (20–100 mM) at 120 °C for 30–60 min, and the resulting cellulose-enriched residual fractions were further enzymatically hydrolyzed. Results showed that the pretreatment of Eucalyptus with GVL/water/acid system led ...
DOI:
10.1016/j.renene.2018.11.038

13. Near-complete removal of non-cellulosic components from bamboo by 1-pentanol induced organosolv pretreatment under mild conditions for robust cellulose enzymatic hydrolysis

Author:
Liu, Jing; Hu, Huichao; Gong, Zhenggang; Yang, Guangxu; Li, Runqing; Chen, Lihui; Huang, Liulian; Luo, Xiaolin
Source:
Cellulose 2019 v.26 no.6 pp. 3801-3814
ISSN:
0969-0239
Subject:
enzymatic hydrolysis,   etc   ; bamboos; biorefining; cellulose; dimethyl sulfoxide; economics; endo-1,4-beta-glucanase; hemicellulose; lignin; lignocellulose; pentanols; solubility; soy protein; sulfuric acid;     Show all 14 Subjects
Abstract:
... Based on Hildebrand solubility parameter (δH) theory, a novel organosolv pretreatment medium (OPM), 1-pentanol (80%, v/v)–water mixture with a δH value of 27.4 (J/cm³)⁻¹/², was discovered. This OPM achieved near-complete removal of non-cellulosic components (hemicellulose 96.2% and lignin 87.8%) from bamboo under mild conditions [130 °C, 20 min, 4% (w/w) H₂SO₄]. For the OPMs with similar δH values ...
DOI:
10.1007/s10570-019-02334-y

14. Physical and chemical characteristics of pretreated slash pine sawdust influence its enzymatic hydrolysis

Author:
Kruyeniski, Julia; Ferreira, Paulo J.T.; Videira Sousa Carvalho, Maria da Graça; Vallejos, María E.; Felissia, Fernando E.; Area, María C.
Source:
Industrial crops and products 2019 v.130 pp. 528-536
ISSN:
0926-6690
Subject:
enzymatic hydrolysis,   etc   ; Pinus elliottii; X-ray diffraction; alkali treatment; biomass; cellulose; crystal structure; hemicellulose; lignin; lignin content; physicochemical properties; porosity; regression analysis; sawdust;     Show all 14 Subjects
Abstract:
... The aim of this work was to evaluate the effect of different pretreatments applied to industrial slash pine sawdust (Pinus elliottii) on its enzymatic hydrolysis. NREL laboratory analytical procedures for standard biomass analysis were used to characterize the thirty one fibrous materials produced. Eight pretreated materials were selected considering both the chemical composition and the enzymatic ...
DOI:
10.1016/j.indcrop.2018.12.075

15. Solid state fermentation process coupled biological pretreatment with cellulase production by Piptoporus betulinus for enhanced cellulose hydrolysis

Author:
Li, Guanhua; Zhang, Huifang; Lu, Yan; Xue, Huiting
Source:
Cellulose 2019 v.26 no.6 pp. 3815-3824
ISSN:
0969-0239
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Piptoporus; cellulose; cost effectiveness; crop yield; economic feasibility; endo-1,4-beta-glucanase; enzyme activity; ethanol; ethanol production; hemicellulose; lignin; lignocellulose; reducing sugars; rice straw; solid state fermentation; weight loss;     Show all 18 Subjects
Abstract:
... An integrated process of cellulase production and pretreatment employing Piptoporus betulinus was proposed to accomplish economic feasibility of lignocellulosic ethanol. After 24 days of cultivation, the maximum loss of weight and hemicellulose of rice straw was 21.25% and 24.79%, respectively. The cellulose was degraded slightly and exposed. Furthermore, the modified lignin led to the weak intera ...
DOI:
10.1007/s10570-019-02359-3

16. Enhanced enzymatic hydrolysis and methane production from rubber wood waste using steam explosion

Author:
Eom, Tokla; Chaiprapat, Sumate; Charnnok, Boonya
Source:
Journal of environmental management 2019 v.235 pp. 231-239
ISSN:
0301-4797
Subject:
enzymatic hydrolysis,   etc   ; anaerobic digestion; cellulose; energy; enzymes; fuel production; hemicellulose; methane; methane production; particle size; rubber; steam; sugars;     Show all 13 Subjects
Abstract:
... Rubber wood waste (RW) requires due to its recalcitrance a pretreatment step before efficient biochemical conversion is possible. Non chemical steam explosion pretreatment was adopted to enhance enzymatic hydrolysis and anaerobic digestion with severity from 2.70 to 4.35. RW treated at severity 4.35 (214 °C for 10 min) gave the highest 83.9 L CH4/kgVS effectiveness in anaerobic digestibility toget ...
DOI:
10.1016/j.jenvman.2019.01.041

17. Comparison of microwave-assisted zinc chloride hydrate and alkali pretreatments for enhancing eucalyptus enzymatic saccharification

Author:
Wei, Weiqi; Zhang, Hongdan; Jin, Yongcan
Source:
Energy conversion and management 2019 v.186 pp. 42-50
ISSN:
0196-8904
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Eucalyptus; alkali treatment; cellulose; crystal structure; endo-1,4-beta-glucanase; energy conservation; feedstocks; glucose; heat; hemicellulose; lignin; microwave radiation; microwave treatment; polysorbates; saccharification; sodium hydroxide; zinc chloride;     Show all 19 Subjects
Abstract:
... In this work, four kinds of pretreatment methods including microwave-assisted ZnCl2·4H2O or NaOH pretreatment, traditional electrical heating ZnCl2·4H2O or NaOH pretreatment were developed and compared for eucalyptus hydrolysis at 100 °C. The effect of various pretreatment methods on hemicellulose and lignin degradation, and as well as subsequent pretreated solids enzymatic saccharification were c ...
DOI:
10.1016/j.enconman.2019.02.054

18. An optimum combined severity factor improves both the enzymatic saccharification yield and the functional lignin structure

Author:
Yuan, Sujuan; Ji, Xingxiang; Ji, Hairui; Tian, Zhongjian; Chen, Jiachuan
Source:
Cellulose 2019 v.26 no.8 pp. 4731-4742
ISSN:
0969-0239
Subject:
enzymatic hydrolysis,   etc   ; Fourier transform infrared spectroscopy; cellulose; glucose; hemicellulose; lignin; liquids; nuclear magnetic resonance spectroscopy; saccharification; thermogravimetry;     Show all 10 Subjects
Abstract:
... Liquid hot water (LHW) pretreatment has become an interesting alternative among the known pretreatment approaches. In this study, an extended combined severity factor (CSF) as LHW pretreatment severity was used to make a balance between the enzymatic hydrolysis of cellulose and the potential application value of lignin. The results, mainly from the degradation of carbohydrates, the enzymatic sacch ...
DOI:
10.1007/s10570-019-02442-9

19. Cellulosic ethanol production: Progress, challenges and strategies for solutions

Author:
Liu, Chen-Guang; Xiao, Yi; Xia, Xiao-Xia; Zhao, Xin-Qing; Peng, Liangcai; Srinophakun, Penjit; Bai, Feng-Wu
Source:
Biotechnology advances 2019 v.37 no.3 pp. 491-504
ISSN:
0734-9750
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Saccharomyces cerevisiae; Zymomonas mobilis; bioethanol; biomass; biosynthesis; brewers yeast; cell walls; cellulose; distillation; ecosystem services; energy; engineering; ethanol; ethanol fermentation; ethanol production; feedstocks; hemicellulose; lignin; lignocellulose; mixing; pentoses; saccharification; system optimization;     Show all 25 Subjects
Abstract:
... Lignocellulosic biomass is a sustainable feedstock for fuel ethanol production, but it is characterized by low mass and energy densities, and distributed production with relatively small scales is more suitable for cellulosic ethanol, which can better balance cost for the feedstock logistics. Lignocellulosic biomass is recalcitrant to degradation, and pretreatment is needed, but more efficient pre ...
DOI:
10.1016/j.biotechadv.2019.03.002

20. Effect of different ionic liquids and anti-solvents on dissolution and regeneration of Miscanthus towards bioethanol

Author:
Dash, Madhusmita; Mohanty, Kaustubha
Source:
Biomass and bioenergy 2019 v.124 pp. 33-42
ISSN:
0961-9534
Subject:
enzymatic hydrolysis,   etc   ; Miscanthus; anions; bioethanol; biomass; cations; cellulose; crystal structure; glucose; hemicellulose; hydrogen bonding; ionic liquids; lignin; sulfates;     Show all 14 Subjects
Abstract:
... The combined effect of anions of ionic liquids (IL) and anti-solvents on pre-treatment and dissolution mechanisms of biomass are not well studied. To reveal the above effect, three different ionic liquids composed with fixed cation ([EMIM]+) but varied anions were studied for Miscanthus dissolution. Results showed that [EMIM]+[Ac]– was very good in altering the cellulose structure and crystallinit ...
DOI:
10.1016/j.biombioe.2019.03.006