Pretreatment and enzymatic hydrolysis for the efficient production of glucose and furfural from wheat straw, pine and poplar chips

Cornejo, Alfonso; Alegría-Dallo, Irantzu; García‐Yoldi, Íñigo; Sarobe, Íñigo; Sanchez, David C.; Otazu, Eduardo; Funcia, Ibai; Gil, María José; Martínez‐Merino, Víctor

doi:10.1016/j.biortech.2019.121583

Cited by 39 publications

(23 citation statements)

References 42 publications

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“…As expected, the purity of the technical lignins SeolA, and OrgB was much higher (98.0 wt.% and 96.1 wt.%, respectively) than those of downstream biorefinery lignins, BioA and B (51.1 wt.% and 69.1 wt.%, respectively). It is important to note that BioA and B presented a relatively high sulfur content coming from the acidic thermal pretreatment with sulfuric acid [ 50 ], which causes some sulfonation in the aromatic rings. Most of the impurities in biorefinery lignins, 38.8 wt.% in BioB and 23.2 wt.% in BioA, corresponded to glycans that were not fully removed upon enzymatic hydrolysis.…”

Section: Resultsmentioning

confidence: 99%

“…were used as feedstocks in the production of 2 G bioethanol in a biorefinery, obtaining BioA and B as byproducts. The whole process for obtaining BioA and B starting solids is detailed in a previous study [ 50 ], although succinctly described below (please see Section 2.1 ). BioA and B lignins were received in powder form and used without further treatments.…”

Section: Methodsmentioning

confidence: 99%

“…Biorefinery downstream lignins, BioA and B, were obtained after acidic pretreatment at 465 K for 5 min of the pine and poplar feedstocks, respectively, which allowed to separate their corresponding hemicellulosic fractions and to valorize them thereafter. The resulting solids presented high accessibility to the cellulosic fraction that was hydrolyzed to glucose using an enzymatic cocktail, whilst yielding BioA and B as downstream biorefinery lignins [ 6 , 50 ].…”

Section: Methodsmentioning

confidence: 99%

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Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins

et al. 2020

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Lignocellulosic materials are promising alternatives to non-renewable fossil sources when producing aromatic compounds. Lignins from Populus salicaceae. Pinus radiata and Pinus pinaster from industrial wastes and biorefinery effluents were isolated and characterized. Lignin was depolymerized using homogenous (NaOH) and heterogeneous (Ni-, Cu- or Ni-Cu-hydrotalcites) base catalysis and catalytic hydrogenolysis using Ru/C. When homogeneous base catalyzed depolymerization (BCD) and Ru/C hydrogenolysis were combined on poplar lignin, the aromatics amount was ca. 11 wt.%. Monomer distributions changed depending on the feedstock and the reaction conditions. Aqueous NaOH produced cleavage of the alkyl side chain that was preserved when using modified hydrotalcite catalysts or Ru/C-catalyzed hydrogenolysis in ethanol. Depolymerization using hydrotalcite catalysts in ethanol produced monomers bearing carbonyl groups on the alkyl side chain. The analysis of the reaction mixtures was done by size exclusion chromatography (SEC) and diffusion ordered nuclear magnetic resonance spectroscopy (DOSY NMR). 31P NMR and heteronuclear single quantum coherence spectroscopy (HSQC) were also used in this study. The content in poly-(hydroxy)-aromatic ethers in the reaction mixtures decreased upon thermal treatments in ethanol. It was concluded that thermo-solvolysis is key in lignin depolymerization, and that the synergistic effect of Ni and Cu provided monomers with oxidized alkyl side chains.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins

et al. 2020

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“…They also reported that reactions under microwave heating were higher yielding than conventional heating, which gave a mixture of aldehyde and carboxylic acid products in reactions with primary alcohols. 148 A detailed kinetic study was carried out by Appels and coworkers, and found that reaction rate was increased by a factor of 2.3 by microwave irradiation, even if the reactions under conventional heating were carried out in nearly identical conditions. 146 Differential heating of the reaction phases did not significantly affect the reaction; instead, it was concluded that molecular radiators were formed at the CH2OH group of glucose and cellulose.…”

Section: Iron-catalyzed Reactionsmentioning

confidence: 99%

Iron-catalyzed cross-coupling of arylboronic acids with unactivated N-heterocycles and quinones under microwave heating

2021

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The iron-catalyzed direct arylation of a variety of N-heteroarenes, quinones, and hydroquinones with arylboronic acids is investigated under microwave heating. The reaction proceeds at 70 °C under air using K2S2O8 as an oxidant and FeSO4 as a catalyst. Under microwave heating reaction rates increased by 14 to 115 times. Reaction scope with N-heteroarenes and quinones is comparable to or slightly expanded when compared to previous reports, but the scope of arylboronic acid utility was slightly limited due to previously unobserved arylboronic acid hydroxydeboronation.

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“…This is partly due to its reduced particle size and high content of carbohydrates, such as cellulose and hemicellulose (~70%), along with low ash content. Moreover, this feedstock is widely available at a cheaper cost and will not, in any way, compete with human or animal consumption [ 8 , 9 ]. However, as compared to the industrial technologies developed for the conversion of sucrose and starch-rich materials to biofuels, a pretreatment step is necessary for this type of feedstock to achieve efficient hydrolysis of the carbohydrates into fermentable sugars.…”

Section: Introductionmentioning

confidence: 99%

Sugar Production from Hybrid Poplar Sawdust: Optimization of Enzymatic Hydrolysis and Wet Explosion Pretreatment

et al. 2020

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Wet explosion pretreatment of hybrid poplar sawdust (PSD) for the production of fermentable sugar was carried out in the pilot-scale. The effects of pretreatment conditions, such as temperature (170–190 °C), oxygen dosage (0.5–7.5% of dry matter (DM), w/w), residence time (10–30 min), on cellulose and hemicellulose digestibility after enzymatic hydrolysis were ascertained with a central composite design of the experiment. Further, enzymatic hydrolysis was optimized in terms of temperature, pH, and a mixture of CTec2 and HTec2 enzymes (Novozymes). Predictive modeling showed that cellulose and hemicellulose digestibility of 75.1% and 83.1%, respectively, could be achieved with a pretreatment at 177 °C with 7.5% O2 and a retention time of 30 min. An increased cellulose digestibility of 87.1% ± 0.1 could be achieved by pretreating at 190 °C; however, the hemicellulose yield would be significantly reduced. It was evident that more severe conditions were required for maximal cellulose digestibility than that of hemicellulose digestibility and that an optimal sugar yield demanded a set of conditions, which overall resulted in the maximum sugar yield.

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Pretreatment and enzymatic hydrolysis for the efficient production of glucose and furfural from wheat straw, pine and poplar chips

Cited by 39 publications

References 42 publications

Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins

Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins

Iron-catalyzed cross-coupling of arylboronic acids with unactivated N-heterocycles and quinones under microwave heating

Sugar Production from Hybrid Poplar Sawdust: Optimization of Enzymatic Hydrolysis and Wet Explosion Pretreatment

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