Dilute acid pretreatment, enzymatic saccharification and fermentation of wheat straw to ethanol

Saha, Badal C.; Iten, Loren B.; Cotta, Michael A.; Wu, Yufeng

doi:10.1016/j.procbio.2005.04.006

Cited by 694 publications

(378 citation statements)

References 26 publications

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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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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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show abstract

“…Numerous pretreatment methods have been employed for biomass processing, such as steam explosion, dilute acid, alkali, ammonia fiber explosion, and supercritical CO 2 (Wu et al, 2011). Among these methods, diluted sulfuric acid pretreatment has been used frequently in biomass-ethanol processing (Saha et al, 2005). An important advantage of acid pretreatment is that it is able to remove most hemicellulose from biomass and increase the total surface area of cellulose for enzymatic hydrolysis (Zeng et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Towards understanding structural changes of photoperiod-sensitive sorghum biomass during sulfuric acid pretreatment

Shi

Wang

2013

Bioresource Technology

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“…Although the cellulolytic enzymes were characterized by higher potentiality of hydrolysis of cellulosic material, due to the gel-like compact solid of microcrystalline cellulose, the access for enzymes could be difficult. Saha et al (2005) fermented wheat straw using Saccharomyces cerevisiae yeast. As a result of the experiments conducted, it was noted that the ethanol content was not dependent on the system of the fermentation process, but on the treatment method of the material prior to hydrolysis and fermentation.…”

Section: Resultsmentioning

confidence: 99%

Influence of the crystalline structure of cellulose on the production of ethanol from lignocellulose biomass

Smuga‐Kogut¹,

Zgórska²,

Szymanowska³

2016

International Agrophysics

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A b s t r a c t. In recent years, much attention has been devoted to the possibility of using lignocellulosic biomass for energy. Bioethanol is a promising substitute for conventional fossil fuels and can be produced from straw and wood biomass. Therefore, the aim of this paper was to investigate the effect of 1-ethyl-3-methylimidazolium pretreatment on the structure of cellulose and the acquisition of reducing sugars and bioethanol from cellulosic materials. Material used in the study was rye straw and microcrystalline cellulose subjected to ionic liquid 1-ethyl-3-methylimidazolium pretreatment. The morphology of cellulose fibres in rye straw and microcrystalline cellulose was imaged prior to and after ionic liquid pretreatment. Solutions of ionic liquid-treated and untreated cellulosic materials were subjected to enzymatic hydrolysis in order to obtain reducing sugars, which constituted a substrate for alcoholic fermentation. An influence of the ionic liquid on the cellulose structure, accumulation of reducing sugars in the process of hydrolysis of this material, and an increase in ethanol amount after fermentation was observed. The ionic liquid did not affect cellulolytic enzymes negatively and did not inhibit yeast activity. The amount of reducing sugars and ethyl alcohol was higher in samples purified with 1-ethyl-3-methylimidazolium acetate. A change in the supramolecular structure of cellulose induced by the ionic liquid was also observed.

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Dilute acid pretreatment, enzymatic saccharification and fermentation of wheat straw to ethanol

Cited by 694 publications

References 26 publications

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

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

Towards understanding structural changes of photoperiod-sensitive sorghum biomass during sulfuric acid pretreatment

Influence of the crystalline structure of cellulose on the production of ethanol from lignocellulose biomass

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