Improved enzymatic hydrolysis yield of rice straw using electron beam irradiation pretreatment

Bak, Jin Seop; Ko, Ja Kyong; Han, Young Hwan; Lee, Byung Cheol; Choi, In Geol; Kim, Kyoung Heon

doi:10.1016/j.biortech.2008.09.010

Cited by 203 publications

(84 citation statements)

References 29 publications

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“…Para isso, tomaram-se os valores máximos obtidos na concentração de glicose e o fator de conversão de glicose em celulose, tal Lu et al 15 Os cálculos do rendimento da hidrólise foram realizados pela seguinte equação: O rendimento médio da hidrólise foi de 53,9%, este valor está dentro do padrão apresentado na literatura para outras biomassas lignocelulósicas que visam à produção de etanol, no qual se encontram percentuais de rendimento de hidrólise para a palha de arroz de 52,0%. 16 e para o bagaço de cana-de-açúcar, em torno de 62,0%. 17 Estes resultados demonstram o bom potencial do capim elefante, quando pré-tratado quimicamente na produção de açúcares fermentescíveis.…”

Section: Resultsunclassified

Rendimento de hidrólise e produção de etanol lignocelulósico a partir de biomassa de capim elefante

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et al. 2016

J. Bioen. Food Sci.

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Section: Resultsunclassified

Rendimento de hidrólise e produção de etanol lignocelulósico a partir de biomassa de capim elefante

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Guarda

et al. 2016

J. Bioen. Food Sci.

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“…If water-soaking pretreatment helps to loosen the polysaccharide or lignin wall, then the extracellular peroxidative enzymes (Table 3) have more open space to contribute extensively. This means that the dynamic aggregative patterns of crosslinked fibrils in the plant cell walls have a fundamental gap in both conservative indices (here CrI; Table 3) [9] and mechanical properties, e.g., thermal expansion coefficient, Young's modulus, and reinforcing efficiency [22][23][24]. It is highly probable that the putative characteristics of fibril aggregates can be generated proactively by environmental damages, such as substrate modification, accelerating biochemical attacks, and oxidative stress.…”

Section: Results and Discussion Bioconversion Yields Of The Wsmb Systemmentioning

confidence: 99%

“…Moreover, the functional spectra of samples were determined with a Bruker D5005 diffractometer (Karlsruhe, Germany) to understand the crystallinity change of WSMB-pretreated RS. The conserved signals were checked in triplicate using the previously reported θ-2θ system [9].…”

Section: Biochemical Indices For Downstream Evaluationmentioning

confidence: 99%

Bioprocess Evaluation of Water Soaking-Based Microbiological Biodegradation with Exposure of Cellulosic Microfibers Relevant to Bioconversion Efficiency

Bak

2015

Appl Biochem Biotechnol

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To verify the interconnective relationship between biodegradation efficiency and microfibril structure, recalcitrant rice straw (RS) was depolymerized using water soaking-based microbiological biodegradation (WSMB). This eco-friendly biosystem, which does not predominantly generate inhibitory metabolites, could increase both the hydrolytic accessibility and fermentation efficiency of RS. In detail, when swollen RS (with Fenton cascades) was simultaneously bio-treated with Phanerochaete chrysosporium for 12 days, the biodegradability was 65.0 % of the theoretical maximum at the stationary phase. This value was significantly higher than the 30.3 % measured from untreated RS. Similarly, the WSMB platform had an effect on the yield enhancement of ethanol productivity of 32.5 %. However, uniform exposure of fibril polymers appeared to have little impact on bioconversion yields. Additionally, the proteomic pools of the WSMB system were analyzed to understand either substrate-specific or nonspecific biocascades based on the change in microcomposite materials. Remarkably, regardless of modified microfibril chains, the significant pattern of 14 major proteins (|fold| > 2) was reasonably analogous in both systems, especially for lignocellulolysis-related targets.

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“…In the severest GL pretreatment conditions, a higher ratio of hemicellulose retention and more delignification can be obtained compared with poplar pretreated with dilute acid (Tian et al 2011). Because cellulose is surrounded by a protective layer of lignin and hemicellulose, the lignin and hemicellulose layers may have a greater chance of being attacked during pretreatment (Bak et al 2009). Higher pretreatment H-factors and TTA charges resulted in an increase of delignification.…”

Section: Fig 2 Residual Lignin In Gl-pretreated Solid As a Functionmentioning

confidence: 99%

Enhancement of Enzymatic Saccharification of Poplar by Green Liquor Pretreatment

et al. 2014

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Green liquor (Na 2 S + Na 2 CO 3 , GL) pretreatment is an effective pathway for improving the enzymatic digestibility of lignocellulosic biomass for the production of bioethanol. In this work, GL was employed as a pretreatment to enhance the enzymatic saccharification of poplar. During pretreatment, the increase of H-factor and TTA charge resulted in enhanced delignification and increased degradation of polysaccharides. The sugar yield of enzymatic hydrolysis increased rapidly with increasing TTA charge in GL pretreatment, while the effect of different H-factors (from 400 to 800) on sugar yield was unnoticeable. The pretreated solid recovery was 75.5% at a lignin removal rate of 29.2% under optimized conditions of total titratable alkali (TTA) charge 20%, sulfidity 25%, and H-factor 400. The sugar yield of glucan, xylan, and total sugar of GLpretreated poplar in enzymatic hydrolysis reached up to 89.9%, 65.5%, and 82.8%, respectively, at a cellulase loading of 40 FPU/g-cellulose. Keywords INTRODUCTIONThe economic and environmental benefits that can be derived from bioethanol have led to extensive research in the bioconversion of lignocellulosic feedstocks into ethanol (Christersson 2008). Bioethanol is a renewable energy source produced through the fermentation of sugars and can reduce greenhouse gas emissions (Yang et al. 2013). Although current research and development attention have focused mainly on agricultural residues and dedicated energy crops, wood biomass (hardwood and softwood) is still an important feedstock for bioethanol production (Zhu and Pan 2010). Large quantities of wood biomass are also sustainably available in various regions of the world.The major differences between wood biomass and agricultural biomass are based on both physical properties and chemical components. Wood biomass is physically larger, structurally stronger, and denser than agricultural biomass. Its higher density significantly reduces transportation cost. Wood biomass has a higher lignin content than agricultural biomass. The lignin is one of the major hurdles for cellulase access to carbohydrate fraction in woody biomass and thus reduces the effectiveness of enzymatic hydrolysis. Therefore, more effort is required to overcome the recalcitrance of wood biomass through pretreatment for an efficient enzymatic saccharification.Poplar has been widely planted in temperate zones because of its rapid growth and ease of stock establishment through stem-or root-cuttings (Kang et al. 1996). Since the introduction of clones in the 1970s, poplar has been incorporated into many managed PEER-REVIEWED ARTICLE bioresources.com Meng et al. (2014). "Green liquor saccharification," BioResources 9(2), 3236-3247. 3237systems for the production of timber and fiber throughout south temperate central China, which has an area of roughly 600,000 km 2 (Fang et al. 1999). Poplar has many characteristics that make it suitable for plantation culture, which enables the production of large quantities of wood in short periods of time.Lignocellulosic biomas...

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Improved enzymatic hydrolysis yield of rice straw using electron beam irradiation pretreatment

Cited by 203 publications

References 29 publications

Rendimento de hidrólise e produção de etanol lignocelulósico a partir de biomassa de capim elefante

Rendimento de hidrólise e produção de etanol lignocelulósico a partir de biomassa de capim elefante

Bioprocess Evaluation of Water Soaking-Based Microbiological Biodegradation with Exposure of Cellulosic Microfibers Relevant to Bioconversion Efficiency

Enhancement of Enzymatic Saccharification of Poplar by Green Liquor Pretreatment

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