Biogas from lignocellulosic biomass Rapport SGC 247 - Yumpu

Sveriges lantbruksuniversitet - Primo - SLU-biblioteket

2013-09-09 · Novel perspectives for evolving enzyme cocktails for lignocellulose hydrolysis in biorefineries. Saritha Mohanram 1, Dolamani Amat 1, Jairam Choudhary 1, Anju Arora 1 & Lata Nain 1 Sustainable Chemical Processes volume 1, Article number: 15 (2013) Cite this article degradation products but is less efficient in breakdown of the lignocellulose, making it less susceptible for enzymatic hydrolysis. In an ideal situation the pretreatment leads to high yields of fermentable sugars with a limited Lignocellulose refers to plant dry matter , so called lignocellulosic biomass. It is the most abundantly available raw material on the Earth for the production of biofuels , mainly bio-ethanol .

Mixtures of starch and lignocelluloses are available in many industrial, agricultural, and municipal wastes and residuals. In this work, dilute sulfuric acid was used for simultaneous pretreatment of lignocellulose and hydrolysis of starch, to obtain a maximum amount of fermentable sugar after enzymatic hydrolysis with cellulase and β-glucosidase. lignocellulose pre-treatment is among the most costly steps and has a major inﬂuence on the costs of both prior operation (e.g., lignocellulose particle size reduction) and subsequent operations (e.g., enzymatic hydrolysis and fermentation) (Wooley et al., 1999; Wyman et al., 2005b). A number of lignocellulose pre-treatment technologies are lignocellulose for enzymatic hydrolysis, or as the actual method of hydrolysis to ferment-able sugars. Dilute-acid pretreatment can be performed either with a short retention time (e.g. 5 min) at high temperature (e.g. 180°C), or at lower temperatures (e.g.

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Some developing and promising pretreatment methods are introduced. Process description, reaction mechanisms and developments in each pretreatment method are reviewed. Enzyme systems for lignocellulose hydrolysis and the influencing factors to enzymatic hydrolysis are presented and promising hydrolysis strategies are outlined.

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Ultrasound can be effectively used to improve the hydrolysis … 2010-3-9 Lignocellulosic biomass (LB) is an abundant and renewable resource from plants mainly composed of polysaccharides (cellulose and hemicelluloses) and an aromatic polymer (lignin). LB has a high potential as an alternative to fossil resources to produce second-generation biofuels and biosourced chemic … Lignin is central to overcoming recalcitrance in the enzyme hydrolysis of lignocellulose. While the term implies a physical barrier in the cell wall structure, there are also important biochemical components that direct interactions between lignin and the hydrolytic enzymes that attack cellulose in plant cell walls.

In nature, microorganisms, especially fungi, are able to degrade the plant cell wall through a set of acting synergistically enzymes. 2017-09-26 · Due to the bifunctionality of rPcAxe, the mixture of enzymes needed for effective lignocellulose hydrolysis can be reduced, which can lower the enzyme cost. Additionally, to a certain extent, the problems associated with the complex interactions and the difficulty in controlling different glycoside hydrolases can be avoided, and the efficiency of enzymatic hydrolysis improved. Se hela listan på frontiersin.org Chapter 19 A Systems View of Lignocellulose Hydrolysis Deepti Tanjore and Tom L. Richard Introduction For 475 million years terrestrial plants have waged an evolutionary battle with hydrolysis of different raw materials is essential for the development of economically competitive processes based on enzymatic treatments. This work focused on factors relevant for the improvement of enzymatic hydrolysis of lignocellulose raw materials derived from softwood.
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Nguyen TC(1), transfer coefficients, homogeneity) and specific inhibitors (concentration gradients). As lignocellulose suspensions consist of long entangled fibres for the matrix of industrial interest, they exhibit diverse and complex properties linked to this Lignocellulose is a potential substrate for ethanol production. However, high cellulose conversion requires high enzyme loading, which makes the process less economically feasible. Addition of surfactants to enzymatic hydrolysis of lignocellulose increases the conversion of cellulose into soluble sugars.

1,2, Ling Leng. 3, Md Khairul Islam. 2, Fanghua Liu. 1, cell wall.
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Sveriges lantbruksuniversitet - Primo - SLU-biblioteket

The inhibitory effects of well-known byproducts from lignocellulose pretreatment, such as furfural, HMF, acetic acid, formic acid, and levulinic acid, on ethanol production and on enzymatic hydrolysis were investigated to possibly cope with the toxicity of those inhibitors under SSF processes utilizing whole slurry of pretreated lignocellulose Biofuels produced from various lignocellulosic materials, such as wood, agricultural, or forest residues, have the potential to be a valuable substitute for, or complement to, gasoline. Many physicochemical structural and compositional factors hinder the hydrolysis of cellulose present in biomass to sugars and other organic compounds that can later be converted to fuels. The goal of Abundant plant biomass has the potential to become a sustainable source of fuels and chemicals. Realizing this potential requires the economical conversion of recalcitrant lignocellulose into useful intermediates, such as sugars.

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This chapter contains an overview of the ligno cellulosic hydrolysis process. Several process issues will be deepened: cellulase enzyme sy stems and hydrolysis mechanisms of cellulose; commercial mixtures; currents limits in the cellulose hydrolysis; innovative bioprocesses and improved biocatalysts. 2. Structure of lignocellulose biomass LIGNOCELLULOSE HYDROLYSIS 309 substance, slightly modified as the hemicellulose is removed, is termed lignin. Alternatively, lignin can be removed in a form that is considerably modified from the natural polymer by treatment with chlorine and leaching with sodium hydroxide (or by using sodium chlorite). The conversion includes two processes: hydrolysis of cellulose in the lignocellulosic materials to fermentable reducing sugars, and fermentation of the sugars to ethanol. The hydrolysis is usually catalyzed by cellulase enzymes, and the fermentation is carried out by yeasts or bacteria.

Aalto-DD 146/2016 9HSTFMG*agjdbj+ ISBN 978-952-60-6931-9 (printed) ISBN 978-952-60-6930-2 (pdf) ISSN-L 1799-4934 cell wall. The resisting part of the lignocellulose is ash and extractives. The amount of cellulose, hemicellulose and lignin varies between species, but normally two thirds consist of cellulose and hemicellulose. These two are also the ones that can be degraded by hydrolysis to monomers and thereafter fermented into ethanol (Chandel and Singh 2017-09-26 · Due to the bifunctionality of rPcAxe, the mixture of enzymes needed for effective lignocellulose hydrolysis can be reduced, which can lower the enzyme cost. Additionally, to a certain extent, the problems associated with the complex interactions and the difficulty in controlling different glycoside hydrolases can be avoided, and the efficiency of enzymatic hydrolysis improved.