Features of promising technologies for pretreatment of lignocellulosic biomass

Mosier, Nathan S.; Wyman, Charles E.; Dale, Bruce E.; Elander, Richard T.; Lee, Y.Y.; Holtzapple, Mark T.; Ladisch, Michael R.

doi:10.1016/j.biortech.2004.06.025

Cited by 5,319 publications

(2,996 citation statements)

References 120 publications

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“…Compared to the composition of other important ethanol feedstocks like corn (Marshall and Sugg 2009;Agbogbo and Wenger 2007) and sugar cane (Hayes 1982), the cassava plant is favorable for production of ethanol of right quality and quantity (Ziska et al 2009). The low amount of reducing sugars obtained from roots during the initial hours of hydrolysis may be attributed to the preparation procedure since they were not crushed but chopped, further confirming the importance of the preparative steps for hydrolysis of the different feedstocks (Ziska et al 2009;Mosier et al 2005). Obtaining high initial levels of reducing sugars in peels and stems compared to roots, along with the stringent preparative procedures required, illustrates the difficulty of using cellulosic feedstocks for ethanol production.…”

Section: Discussionmentioning

confidence: 94%

Bio-Ethanol Production from Non-Food Parts of Cassava (Manihot esculenta Crantz)

Nuwamanya

Chiwona‐Karltun

Kawuki

et al. 2011

AMBIO

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Global climate issues and a looming energy crisis put agriculture under pressure in Sub-Saharan Africa. Climate adaptation measures must entail sustainable development benefits, and growing crops for food as well as energy may be a solution, removing people from hunger and poverty without compromising the environment. The present study investigated the feasibility of using non-food parts of cassava for energy production and the promising results revealed that at least 28% of peels and stems comprise dry matter, and 10 g feedstock yields [8.5 g sugar, which in turn produced [60% ethanol, with pH & 2.85, 74-84% light transmittance and a conductivity of 368 mV, indicating a potential use of cassava feedstock for ethanol production. Thus, harnessing cassava for food as well as ethanol production is deemed feasible. Such a system would, however, require supportive policies to acquire a balance between food security and fuel.

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Section: Discussionmentioning

confidence: 94%

Bio-Ethanol Production from Non-Food Parts of Cassava (Manihot esculenta Crantz)

Nuwamanya

Chiwona‐Karltun

Kawuki

et al. 2011

AMBIO

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“…Examples include physical (e.g., limited pyrolysis and mechanical disruption/comminution, Mosier et al, 2005), physicochemical (e.g., steam explosion, ammonia fiber explosion, Grous et al, 1986;Mes-Hartree et al, 1988), chemical (e.g., acid hydrolysis, alkaline hydrolysis, high temperature organic solvent pretreatment, oxidative delignification, Chum et al, 1988;Gierer and Noren, 1982;Zhang et al, 2007), and biological (e.g., lignin degradation by white-and soft-rot fungi, Hatakka, 1983;Lee, 1997) methods. In all cases, upon sufficient removal of the lignin, there was also substantial degradation of lignin and in many cases there was substantial loss in fermentable sugar content of the residual polysaccharides (Galbe and Zacchi, 2007).…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid‐mediated selective extraction of lignin from wood leading to enhanced enzymatic cellulose hydrolysis

Lee

Doherty

Linhardt

et al. 2008

Biotech & Bioengineering

848

571

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Lignocellulose represents a key sustainable source of biomass for transformation into biofuels and bio-based products. Unfortunately, lignocellulosic biomass is highly recalcitrant to biotransformation, both microbial and enzymatic, which limits its use and prevents economically viable conversion into value-added products. As a result, effective pretreatment strategies are necessary, which invariably involves high energy processing or results in the degradation of key components of lignocellulose. In this work, the ionic liquid, 1-ethyl-3-methylimidazolium acetate ([Emim][CH 3 COO]), was used as a pretreatment solvent to extract lignin from wood flour. The cellulose in the pretreated wood flour becomes far less crystalline without undergoing solubilization. When 40% of the lignin was removed, the cellulose crystallinity index dropped below 45, resulting in >90% of the cellulose in wood flour to be hydrolyzed by Trichoderma viride cellulase. [Emim] [CH 3 COO] was easily reused, thereby resulting in a highly concentrated solution of chemically unmodified lignin, which may serve as a valuable source of a polyaromatic material as a value-added product.

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“…These pretreatments include dilute acid (Lloyd and Wyman 2005;Saha et al 2005;Schell et al 2003), hot water (Liu and Wyman 2004;Ruiz et al 2013), ammonia fiber expansion (Hoover et al 2014;Lau et al 2008;Murnen et al 2007), steam explosion (Grous et al 1986;Kaar et al 1998), lime (Chang et al 1997;Kim and Holtzapple 2005), organic solvent (Zhang et al 2007;Zhao et al 2009b), and pyrolysis and mechanical disruption (Mosier et al 2005). In all these treatments, the substantial degradation of lignin is accompanied by considerable reduction in fermentable sugar content of the feedstock, resulting in a loss of 20-35% of the mass of lignocellulose (Galbe and Zacchi 2007;Lee et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-tolerant microorganisms and microbial communities for lignocellulose conversion to bioproducts

Simmons

Singer

et al. 2016

Appl Microbiol Biotechnol

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Chemical and physical pretreatment of biomass is a critical step in the conversion of lignocellulose to biofuels and bioproducts. Ionic liquid (IL) pretreatment has attracted significant attention due to the unique ability of certain ILs to solubilize some or all components of the plant cell wall. However, these ILs not only inhibit enzyme activities, but also the growth and productivity of microorganisms used in downstream hydrolysis and fermentation processes.While pretreated biomass can be washed to remove residual IL and reduce inhibition, extensive washing is costly and not feasible in large-scale processes. IL tolerant microorganisms and microbial communities have been discovered from environmental samples and studies begun to elucidate mechanisms of IL tolerance. The discovery of IL tolerance in environmental microbial communities and individual microbes has lead to the proposal of molecular mechanisms of resistance. In this article, we review recent progress on discovering IL tolerant microorganisms, identifying metabolic pathways and mechanisms of tolerance, and engineering microorganisms for IL tolerance. Research in these areas will yield new approaches to overcome inhibition in lignocellulosic biomass bioconversion processes and increase opportunities for the use of ILs in biomass pretreatment.

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Features of promising technologies for pretreatment of lignocellulosic biomass

Cited by 5,319 publications

References 120 publications

Bio-Ethanol Production from Non-Food Parts of Cassava (Manihot esculenta Crantz)

Bio-Ethanol Production from Non-Food Parts of Cassava (Manihot esculenta Crantz)

Ionic liquid‐mediated selective extraction of lignin from wood leading to enhanced enzymatic cellulose hydrolysis

Ionic liquid-tolerant microorganisms and microbial communities for lignocellulose conversion to bioproducts

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