Chemical characteristics and enzymatic saccharification of lignocellulosic biomass treated using high-temperature saturated steam: Comparison of softwood and hardwood

Asada, Chikako; Sasaki, Chizuru; Hirano, Takeshi; Nakamura, Yoshitoshi

doi:10.1016/j.biortech.2015.02.005

Cited by 31 publications

(10 citation statements)

References 32 publications

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“…Presumably, the combination of high severity and the addition of SO 2 produced further disruption of the lignocellulosic matrix and improved hemicellulose removal. Similar results were obtained by other researchers working with higher severities than those used in the present work and/or with acid catalyst (Söderström et al 2003, Cotana et al 2014, Asada et al 2015.…”

Section: Resultssupporting

confidence: 92%

“…Moreover, acid-catalyzed steam explosion of Eucalyptus grandis chips achieved a EH yield of about 57% (Emmel et al 2003), twice as high as the one recorded for Slash pine sawdust obtained under similar conditions (Stoffel et al 2017). These differences could be related to the amount and type of lignin present in softwoods (Asada et al 2015). In a study on isolated lignins from pretreated corn stover, poplar, and lodgepole pine on the EH, Nakagame et al (2010) found that softwood lignin has a stronger negative influence on EH than that of other sources.…”

Section: Resultsmentioning

confidence: 99%

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Fractionation of Pinus radiata wood by combination of steam explosion and organosolv delignification

Imlauer-Vedoya

Vergara-Alarcón

Área

et al. 2019

Maderas, Cienc. tecnol.

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This work proposes a sequential combination of steam explosion and organosolv delignification for Pinus radiata fractionation. An efficient pretreatment to fully optimize the use of lignocellulosic materials is the key to make a biorefinery profitable, especially for softwoods, known to be more recalcitrant than other lignocellulosic raw materials. Steam explosion has a dual effect on biomass as morphological and chemical changes are introduced. A delignifying stage has been stated to be necessary in order to ease hydrolytic enzymes accessibility to cellulose while avoiding non-productive bonds with the lignin present. Three steam explosion conditions were tested (170°C, 5 min; 180°C, 10 min; 170°C, 5+5 min) followed by an organosolv delignification stage, carried out at two different conditions (170°C, 60 min; 170°C, 90 min). All treatment yields, delignification extent, and hydrolysis yields were determined to evaluate each stage. The steam explosion treatment did not produce high delignification extent. Maximum global delignification (50,4%) was achieved when combining the two-cycle steam explosion with the most severe post-treatment condition tested. Enzymatic hydrolysis of the cellulosic residue improved after organosolv delignification; however, hydrolysis yields did not exceed 35%. The chemical changes undergone by softwood lignins are presumably responsible for the low digestibility.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Fractionation of Pinus radiata wood by combination of steam explosion and organosolv delignification

Imlauer-Vedoya

Vergara-Alarcón

Área

et al. 2019

Maderas, Cienc. tecnol.

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“…Hydrolytic efficiency was 86.16%. Asada et al, (2015) reported a saccharification slightly higher than what is seen in this paper, with a glucose yield of 89% for pre-treated Beech wood using enzymatic hydrolysis (initial substrate concentration of 2%, using of 0.1 g of enzyme per 1 g of substrate, at 140 strokes/min for 120 h and 50°C).…”

Section: Discussioncontrasting

confidence: 60%

Evaluation of buriti endocarp as lignocellulosic substrate for second generation ethanol production

Rodrigues

Araújo

Rocha

et al. 2018

Preprint

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The production of lignocellulosic ethanol is one of the most promising alternatives to fossil fuels, however, this technology still faces many challenges related to the viability of the alcohol in the market. In this paper the endocarp of buriti fruit was assessed for ethanol production. The whole fruit was characterized physically and chemically and its endocarp submitted to acid and alkaline pre-treatments, which were optimized through the use of surface response methodology for removal of hemicellulose and lignin, respectively. Abstract 16 The production of lignocellulosic ethanol is one of the most promising alternatives to fossil fuels, 17 however, this technology still faces many challenges related to the viability of the alcohol in the 18 market. In this paper the endocarp of buriti fruit was assessed for ethanol production. The whole 19 fruit was characterized physically and chemically and its endocarp submitted to acid and alkaline 20 pre-treatments, which were optimized through the use of surface response methodology for 21 removal of hemicellulose and lignin, respectively. Hemicellulose content was reduced by 88% 22 after acid pretreatment. Alkaline pre-treatment reduced the lignin content in the recovered 23 biomass from 11.8% to 4.2% and increased the concentration of the cellulosic fraction to 88.5%. 24 The pre-treated biomass was saccharified by the action of cellulolytic enzymes and, in the 25 optimized condition, was able to produce 110 g of glucose per L of hydrolyzate. Alcoholic 26 fermentation of the enzymatic hydrolyzate bio-catalized by Saccharomyces cerevisiae resulted in 27 a fermented medium with 4.3% ethanol and Y P/S of 0.33 . The current configuration of global economic advance has created a growing demand for 33 energy resources to support its maintenance. Additionally, the growth of the human population 34 on the planet, the depletion of fossil fuels and the growing concerns about human impacts on the 35 environment have encouraged the search for renewable sources to the development of green 36 energy production (Singh, Nigam & Murphy, 2011; Sarkar et al., 2012). In this context, 37 lignocellulosic biomasses are a promising feedstock for the production of liquid biofuels, 38 alternative to petroleum based fuels (Cherubini & Ulgiati, 2010). 39The technology for the production of second generation (2G) bioethanol, or 40 lignocellulosic ethanol, has evolved in the last decades and functioning industrial plants already 41 exist in some parts of the world, nevertheless, this biofuel still faces the challenge of feedstock 42 access, supply chain infrastructure, and price competitiveness with the petroleum industry (UNCTAD, 43 2016). 44Lignocellulosic ethanol can be obtained from the fermentation of hexoses and pentoses 45 derived from the polysaccharides that constitute the plants cell wall and require additional 46 operations to those normally used to produce first generation ethanol (Mielenz, 2001). Lignin 47 removal and hemicellulose hydrolysis, followed by cellulose saccharif...

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“…The XRD patterns show diffraction peaks at 2 θ around 16.9° and 21.56°, which is similar to cellulose I, corresponding to the crystal face of (110) and (200) crystal spacings of cellulose I; therefore, the addition of HSPI/U/F copolymer resin and degradation treatment did not change the crystal form, although the C r I s of all samples were significantly different from that of straw fiber [ 51 ]. The C r I values of samples, such as BFP, BFP-I, and BFP after 24 months of degradation, namely, BFP and BFP-I, were 49.45%, 41.25%, 53.09% and 50.74% ( Table 3 ), which was calculated by the occupancy rate of the crystalline portion of the specimen [ 52 ]. Similar or decreased C r I values were observed, when compared to for BFP (49.45%).…”

Section: Resultsmentioning

confidence: 99%

Green Preparation of Straw Fiber Reinforced Hydrolyzed Soy Protein Isolate/Urea/Formaldehyde Composites for Biocomposite Flower Pots Application

Sun

Liao

Zhang³

et al. 2018

Materials

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The effects of soil burial on the biodegradation of biocomposite flower pots (BFP) made from straw fiber (SF) and hydrolyzed soy protein isolate/urea/formaldehyde (HSPI/U/F) copolymer resin were studied in detail. The microstructure, crystallinity, functional groups, mechanical, degradation and thermal property of the prepared SF with HSPI/U/F copolymer resin have been studied, and the degradation mechanism was also elucidated. XRD results showed that the bond breakage between SF and HSPI/U/F copolymer resin induced a decrease in relative degradation-resistant crystal structures. FTIR spectra showed that the methylolated HSPI units could form a cross-linking network with U/F and SF. The BFP degradation after soil burial was mainly attributed to the effects of microorganisms. The degradation products were environmentally friendly, because they were degradable and could fertilize the soil. In addition, the U/F adhesives were slightly degraded by the microorganisms due to the HSPI in the pots. The TG and DSC results showed that the molecular motion of the BFP matrix could be restricted by the degradation action and the content of HSPI, resulting in decreased crystallization enthalpy and showing good thermal property. The tensile strength of different reinforced samples was not significantly reduced in comparison to U/F resin, and still kept good mechanical performance. Thus, the prepared SF reinforced HSPI/U/F copolymer resins could have good potential for use in the field of biodegradable flower pots because of their good thermal property, mechanical property, biodegradability, and relatively low cost.

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Chemical characteristics and enzymatic saccharification of lignocellulosic biomass treated using high-temperature saturated steam: Comparison of softwood and hardwood

Cited by 31 publications

References 32 publications

Fractionation of Pinus radiata wood by combination of steam explosion and organosolv delignification

Fractionation of Pinus radiata wood by combination of steam explosion and organosolv delignification

Evaluation of buriti endocarp as lignocellulosic substrate for second generation ethanol production

Green Preparation of Straw Fiber Reinforced Hydrolyzed Soy Protein Isolate/Urea/Formaldehyde Composites for Biocomposite Flower Pots Application

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