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1. Improved Reactivity of Cellulose via Its Crystallinity Reduction by Nondissolving Pretreatment with an Ionic Liquid

Author:
Pena, Carlos A.; Soto, Ana; King, Alistair W. T.; Rodríguez, Héctor
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.10 pp. 9164-9171
ISSN:
2168-0485
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; acetates; biorefining; cellulose; crystal structure; dimethyl sulfoxide; filtration; ionic liquids; polymerization; polymers; reaction kinetics; thermal stability;     Show all 13 Subjects
Abstract:
... The improvement of the reactivity of cellulose by means of an efficient pretreatment method is critical for the optimal valorization of this biorenewable polymer within a biorefinery context. In this work, a nondissolving procedure for the pretreatment of cellulose, based on the direct solid–liquid contact of cellulose with an ionic liquid, namely tetrabutylphosphonium acetate, or with its mixture ...
DOI:
10.1021/acssuschemeng.8b06357

2. Enzymatic hydrolysis of cellulose nanoplatelets as a source of sugars with the concomitant production of cellulose nanofibrils

Author:
Chávez-Guerrero, Leonardo; Silva-Mendoza, Julio; Sepúlveda-Guzmán, Selene; Medina-Aguirre, Norberto Alan; Vazquez-Rodriguez, Sofia; Cantú-Cárdenas, María Elena; García-Gómez, Nora Aleyda
Source:
Carbohydrate polymers 2019 v.210 pp. 85-91
ISSN:
0144-8617
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Trichoderma; X-ray diffraction; biopolymers; cellulose; cellulose nanofibers; crystal structure; embryophytes; endo-1,4-beta-glucanase; glucose;     Show all 11 Subjects
Abstract:
... Cellulose, the most abundant biopolymer on earth, is produced at different ratios by all land plants. Since the morphology and crystallinity of cellulose are key factors involved in its enzymatic hydrolysis, in the present work, we tackled the study of the effects of such variables on the nanocellulose conversion into glucose. Cellulase from Trichoderma sp at 37 °C was used to produce glucose, the ...
DOI:
10.1016/j.carbpol.2019.01.055

3. Enhanced enzymatic hydrolysis of wheat straw via a combination of alkaline hydrogen peroxide and lithium chloride/N,N-dimethylacetamide pretreatment

Author:
Li, Hailong; Xiong, Lian; Chen, Xindong; Luo, Mutan; Chen, Xuefang; Wang, Can; Huang, Chao; Chen, Xinde
Source:
Industrial crops and products 2019 v.137 pp. 332-338
ISSN:
0926-6690
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; cellulose; crystal structure; delignification; endo-1,4-beta-glucanase; hydrogen bonding; hydrogen peroxide; lithium chloride; saccharification; sugars; synergism; wheat straw; xylan; xylanases;     Show all 15 Subjects
Abstract:
... The aim of this work was to enhance enzymatic hydrolysis of wheat straw (WS) via a combination of alkaline hydrogen peroxide (AHP) and lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) pretreatment. The physicochemical structural changes of pretreated WS were systematically characterized. Furthermore, the hydrolytic efficiency and synergistic action between xylanase and cellulase in the enzymatic ...
DOI:
10.1016/j.indcrop.2019.05.027

4. Combination of Superheated Steam Explosion and Alkaline Autoclaving Pretreatment for Improvement of Enzymatic Digestibility of the Oil Palm Tree Residues as Alternative Sugar Sources

Author:
Thamsee, Tanya; Choojit, Saovanee; Cheirsilp, Benjamas; Yamseangsung, Ram; Ruengpeerakul, Taweesak; Sangwichien, Chayanoot
Source:
Waste and biomass valorization 2019 v.10 no.10 pp. 3009-3023
ISSN:
1877-2641
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; Elaeis guineensis; autoclaves; autoclaving; cell walls; cellulose; crystal structure; ethanol production; fruits; glucose; hemicellulose; lignin; lignocellulose; plant residues; reducing sugars; scanning electron microscopy; sodium hydroxide;     Show all 18 Subjects
Abstract:
... Pretreatment processes play an important role in the conversion of lignocelluloses materials to reducing sugar for ethanol production. They help in breaking the structure of lignin and disrupt the crystalline structure of cellulose and hemicellulose, thus improving enzymatic accessibility during hydrolysis. In this study, various alternatives to pretreat oil palm empty fruit bunches (OPEFB), oil p ...
DOI:
10.1007/s12649-018-0292-z

5. Enzymatic production of cello-oligomers with endoglucanases

Author:
Kluge, Stefanie; Bonhage, Benjamin; Viell, Jörn; Granström, Mari; Kindler, Alois; Spiess, Antje C.
Source:
Cellulose 2019 v.26 no.7 pp. 4279-4290
ISSN:
0969-0239
Subject:
alkaline hydrolysis; enzymatic hydrolysis,   etc   ; X-ray diffraction; byproducts; cellulose; crystal structure; endo-1,4-beta-glucanase; ionic liquids; polymerization; raw materials; sugars;     Show all 11 Subjects
Abstract:
... Cello-oligomers have a wide application range and are gained from three different cello-oligomer production paths, which show different drawbacks, namely acid or alkaline hydrolysis of cellulose, chemical or enzymatic synthesis, and enzymatic hydrolysis of cellulose using cellulase mixtures. Therefore, this study aims at a novel route towards cello-oligomers using purified endoglucanases. From the ...
DOI:
10.1007/s10570-019-02390-4

6. Influence of residual lignin and thermal drying on the ultrastructure of chemical hardwood pulp and its enzymatic hydrolysis properties

Author:
Li, Yaping; Li, Bo; Mo, Wenxuan; Yang, Wenjing; Wu, Shubin
Source:
Cellulose 2019 v.26 no.3 pp. 2075-2085
ISSN:
0969-0239
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; adsorption; cellulose; crystal structure; drying; endo-1,4-beta-glucanase; glucose; hardwood; lignin; lignin content; moieties; porosity; pulp; shrinkage; surface area; ultrastructure;     Show all 17 Subjects
Abstract:
... Recycled pulp can be used as a potential and sustainable resource for production of fermentable monosaccharides. In this work, the effects of residual lignin and thermal drying on ultrastructure, physical properties and further enzymatic digestibility of chemical pulps were investigated. The results showed that drying process (at 105 °C for 24 h) did not significantly change the functional groups ...
DOI:
10.1007/s10570-018-2184-6

7. Characterization of physicochemical properties of cellulose from potato pulp and their effects on enzymatic hydrolysis by cellulase

Author:
Cheng, Li; Hu, Xiaohui; Gu, Zhengbiao; Hong, Yan; Li, Zhaofeng; Li, Caiming
Source:
International journal of biological macromolecules 2019 v.131 pp. 564-571
ISSN:
0141-8130
Subject:
enzymatic hydrolysis; hydrolysis,   etc   ; adsorption; byproducts; cellulose; corn stover; crystal structure; endo-1,4-beta-glucanase; food science; glucose; industry; pectins; potato pulp; potato starch; sodium sulfite; sorption isotherms; surface area; China;     Show all 18 Subjects
Abstract:
... In this work, cellulose was extracted from potato pulp, a low-efficiently utilized by-product from potato starch industry, by a combined alkali and sodium sulfite treatment. Its physicochemical properties were characterized and compared with cellulose from corn stalk. The yield and purity of cellulose from potato pulp were determined to be 24.74% and 81.34% respectively. Cellulose from potato pulp ...
DOI:
10.1016/j.ijbiomac.2019.02.164

8. 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

9. Enzymatically assisted isolation of high-quality cellulose nanoparticles from water hyacinth stems

Author:
Juárez-Luna, Gregorio N.; Favela-Torres, Ernesto; Quevedo, Iván R.; Batina, Nikola
Source:
Carbohydrate polymers 2019 v.220 pp. 110-117
ISSN:
0144-8617
Subject:
enzymatic hydrolysis,   etc   ; Eichhornia crassipes; atomic force microscopy; cellulose; crystal structure; endo-1,4-beta-glucanase; hydrodynamics; nanocrystals; nanomedicine; nanoparticles; stems;     Show all 11 Subjects
Abstract:
... High quality cellulose nanoparticles (CNP) were isolated from water hyacinth stem cellulose (Cel-WH) extracted via successive thermochemical and alkaline-peroxide treatments, and further enzymatically hydrolysed using the commercial cellulase complex, NS22086, at 50ºC. The maximum CNP concentration was reached after 120 min of enzymatic hydrolysis, with a hydrodynamic diameter in the order of 200− ...
DOI:
10.1016/j.carbpol.2019.05.058

10. Coupling the post-extraction process to remove residual lignin and alter the recalcitrant structures for improving the enzymatic digestibility of acid-pretreated bamboo residues

Author:
Huang, Caoxing; Lin, Wenqian; Lai, Chenhuan; Li, Xin; Jin, Yongcan; Yong, Qiang
Source:
Bioresource technology 2019 v.285 pp. 121355
ISSN:
0960-8524
Subject:
enzymatic hydrolysis,   etc   ; ambient temperature; bamboos; cellulose; crystal structure; delignification; ethanol; hydrophobicity; lignin; moieties; phosphoric acid; sugars; urea;     Show all 13 Subjects
Abstract:
... In this work, a mild and facile post-extraction using different reagents was evaluated to overcome these recalcitrance for improving the enzymatic digestibility of acid-pretreated bamboo residues by removing the lignin and disrupting its inhibitory properties. Results showed that the enzymatic digestibility of acid-pretreated bamboo residues can be improved from 15.4% to 61.4%, 59.7%, and 42.8% by ...
DOI:
10.1016/j.biortech.2019.121355

11. 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

12. Effect of physicochemical pretreatments plus enzymatic hydrolysis on the composition and morphologic structure of corn straw

Author:
Wang, Ping; Liu, Chaoqi; Chang, Juan; Yin, Qingqiang; Huang, Weiwei; Liu, Yang; Dang, Xiaowei; Gao, Tianzeng; Lu, Fushan
Source:
Renewable energy 2019 v.138 pp. 502-508
ISSN:
0960-1481
Subject:
enzymatic hydrolysis,   etc   ; cellulose; corn straw; crystal structure; extrusion; hemicellulose; hydrogen peroxide; lignin; reducing sugars; renewable energy sources; scanning electron microscopes; sodium hydroxide; ultrasonics;     Show all 13 Subjects
Abstract:
... In order to decrease corn straw crystallinity for improving reducing sugar yield, physicochemical pretreatments plus enzymatic hydrolysis were investigated. The results showed that hemicellulose and lignin degradation rates in corn straw treated with physical method (ultrasound wave (group 12), extrusion + ultrasound wave (group 14), extrusion + ultrasound wave + microwave (group 15)) combined wit ...
DOI:
10.1016/j.renene.2019.01.118

13. Pretreatment of Eucalyptus urophylla in γ-valerolactone/dilute acid system for removal of non-cellulosic components and acceleration of enzymatic hydrolysis

Author:
Sun, Shao Ni; Chen, Xue; Tao, Ying Hua; Cao, Xue Fei; Li, Ming Fei; Wen, Jia Long; Nie, Shuang Xi; Sun, Run Cang
Source:
Industrial crops and products 2019 v.132 pp. 21-28
ISSN:
0926-6690
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus urophylla; biomass; cell walls; cellulose; chemical composition; crystal structure; feedstocks; glucose; hemicellulose; lignin; molecular weight; sulfuric acid; value added;     Show all 14 Subjects
Abstract:
... Enzymatic hydrolysis of biomass is highly dependent on the changes in chemical compositions and structural characteristics after pretreatment. γ-Valerolactone (GVL)/dilute acid pretreatment is an effective approach to remove hemicelluloses and lignin and disrupt the cell wall structure, leading to the improvement of enzymatic hydrolysis. This study examined the influence of chemical compositions a ...
DOI:
10.1016/j.indcrop.2019.02.004

14. 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

15. 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

16. A study of properties and enzymatic hydrolysis of bacterial cellulose

Author:
Kashcheyeva, Ekaterina I.; Gladysheva, Evgenia K.; Skiba, Ekaterina A.; Budaeva, Vera V.
Source:
Cellulose 2019 v.26 no.4 pp. 2255-2265
ISSN:
0969-0239
Subject:
enzymatic hydrolysis,   etc   ; Fourier transform infrared spectroscopy; X-ray diffraction; cellulose; crystal structure; culture media; drying; hydrolysates; oat hulls; reducing sugars; scanning electron microscopy; thermogravimetry;     Show all 12 Subjects
Abstract:
... This study evaluates how bacterial cellulose (BC) properties influence the efficiency of enzymatic hydrolysis. BC was produced by the Medusomyces gisevii Sa-12 symbiotic culture in an enzymatic hydrolyzate obtained from oat hulls and was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and X-ray diffraction. The enzymatic hydrolysi ...
DOI:
10.1007/s10570-018-02242-7

17. New Insight into Enzymatic Hydrolysis of the Rice Straw and Poplar: an In-depth Statistical Analysis on the Multiscale Recalcitrance

Author:
Liu, Mingren; Wang, Lei; Si, Mengying; Wang, Zhongren; Zhang, Tingzheng; Cheng, Xunqiang; Min, Xiaobo; Chai, Liyuan; Shi, Yan
Source:
BioEnergy research 2019 v.12 no.1 pp. 21-33
ISSN:
1939-1234
Subject:
enzymatic hydrolysis,   etc   ; Oryza sativa; Populus; biomass; biorefining; cell walls; cellulose; crystal structure; glucose; lignin; lignocellulose; moieties; principal component analysis; regression analysis; rice straw; xylan; xylose;     Show all 17 Subjects
Abstract:
... Certain substrate-related parameters that determine sugar release from pretreated lignocellulosic biomass are important for the biorefinery process optimization. Unfortunately, phylogenetical differences in plants often complicate physicochemical variances and mask mechanisms of biomass recalcitrance. Herein, an in-depth statistical approach that combines correlation analysis, principal component ...
DOI:
10.1007/s12155-019-9959-y

18. Effective delignification and decrystallization of cauliflower wastes by using dilute phosphoric acid for efficient enzymatic digestibility to produce fermentable sugars

Author:
Majumdar, Sayari; Naha, Antara; Bhattacharyya, D.K.; Bhowal, Jayati
Source:
Biomass and bioenergy 2019 v.125 pp. 169-179
ISSN:
0961-9534
Subject:
enzymatic hydrolysis,   etc   ; X-ray diffraction; biomass; cauliflower; cellulose; cellulosic fibers; crystal structure; delignification; endo-1,4-beta-glucanase; feedstocks; hemicellulose; leaves; lignin; pH; phosphoric acid; porosity; reducing sugars; saccharification; scanning electron microscopy; temperature; wastes;     Show all 21 Subjects
Abstract:
... The present study investigated the feasibility of using cauliflower wastes (stalk and leaf) as novel feedstock for production of fermentable sugars, thus reducing the wastage. In this investigation cauliflower wastes were pretreated with dilute phosphoric acid (H3PO4) prior to enzymatic hydrolysis for better release of fermentable sugars. Maximum total reducing sugar yields were achieved at 121 °C ...
DOI:
10.1016/j.biombioe.2019.04.017

19. Cellulose nanocrystals from rice and oat husks and their application in aerogels for food packaging

Author:
de Oliveira, Jean Paulo; Bruni, Graziella Pinheiro; el Halal, Shanise Lisie Mello; Bertoldi, Fabiano Cleber; Dias, Alvaro Renato Guerra; Zavareze, Elessandra da Rosa
Source:
International journal of biological macromolecules 2019 v.124 pp. 175-184
ISSN:
0141-8130
Subject:
enzymatic hydrolysis,   etc   ; Eucalyptus; aerogels; cellulose; crystal structure; food packaging; mechanical methods; moieties; nanocrystals; oat hulls; oats; particle size; porosity; rice; thermal properties; water binding capacity; water uptake; zeta potential;     Show all 18 Subjects
Abstract:
... This study describes the valorization of rice and oat husks by obtaining cellulose nanocrystals for the production of aerogels for food packaging applications. Commercial cellulose was used as a control sample. Nanocrystals from cellulose were obtained by enzymatic hydrolysis and mechanical treatment at high pressure. The morphology, particle size, functional groups, crystallinity, and thermal pro ...
DOI:
10.1016/j.ijbiomac.2018.11.205