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Author: Pratima Bajpai
Publisher: Elsevier
ISBN: 0323994970
Category : Technology & Engineering
Languages : en
Pages : 270
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Book Description
Cellulases in the Biofuel Industry discusses how the properties of cellulases affects the quality of the biofuels produced. Heralded as the solution to humanity’s energy problem and the savior of the world’s climate, extensive research is being carried out on biofuels but there are still gaps in our understanding. This book presents cost-effective and current scenarios for cellulase production in the biofuel industry, including the most recent advancements for obtaining cellulases with higher activity on pre-treated biomass substrates by screening and sequencing new organisms, engineering cellulases with improved properties, and by identifying proteins that can stimulate cellulases. The mechanism and efficiency of the cellulase enzyme system on cellulose is discussed with the specific classification of each cellulase enzyme, as well as explanations of the limitation of cellulases in terms of their production processes, efficiency and practical applications to biofuels. Various approaches to improve the production and efficiency of the cellulase enzyme system are evaluated, along with the current limitations that are hampering cost-effective production of cellulase and guidance on how these limitations might be resolved. Includes different approaches to improve the production and efficiency of the cellulase enzyme system Discusses the current limitations hampering the cost-effective production of cellulases Provides case studies that include essential information for those looking to adapt cellulases technology
Author: Manish Srivastava
Publisher: Springer
ISBN: 3030147266
Category : Science
Languages : en
Pages : 209
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Book Description
Cellulase is a key enzyme of industrial interest and plays a crucial role in the hydrolysis of cellulose, a prime component of plant cell walls. Cellulase covers a broad area in the global market of industrially important enzymes and it is considered as the third largest industrial enzyme globally. Additionally, cellulase contributes about 20% of the total enzyme market globally because of its massive demand in various industries such as in biofuel production, pulp, paper, textile, food, and beverages, as well as in detergent industries. Among these, the demand of cellulase may become frequently selected in the commercial production of biofuels in the future and thus will further increase demand of cellulase in the biofuel industry. Because biofuel production is still not realized in a cost-effective, practical implementation due to its high cost (the higher cost of biofuels is due to higher production costs of enzymes), there is a need to introduce these types of approaches, which will help to lower the cost of enzyme production for developing overall economic biofuel production.
Author: Pratima Bajpai
Publisher: Elsevier
ISBN: 0323994970
Category : Technology & Engineering
Languages : en
Pages : 270
Get Book Here
Book Description
Cellulases in the Biofuel Industry discusses how the properties of cellulases affects the quality of the biofuels produced. Heralded as the solution to humanity’s energy problem and the savior of the world’s climate, extensive research is being carried out on biofuels but there are still gaps in our understanding. This book presents cost-effective and current scenarios for cellulase production in the biofuel industry, including the most recent advancements for obtaining cellulases with higher activity on pre-treated biomass substrates by screening and sequencing new organisms, engineering cellulases with improved properties, and by identifying proteins that can stimulate cellulases. The mechanism and efficiency of the cellulase enzyme system on cellulose is discussed with the specific classification of each cellulase enzyme, as well as explanations of the limitation of cellulases in terms of their production processes, efficiency and practical applications to biofuels. Various approaches to improve the production and efficiency of the cellulase enzyme system are evaluated, along with the current limitations that are hampering cost-effective production of cellulase and guidance on how these limitations might be resolved. Includes different approaches to improve the production and efficiency of the cellulase enzyme system Discusses the current limitations hampering the cost-effective production of cellulases Provides case studies that include essential information for those looking to adapt cellulases technology
Author: Vijai Kumar Gupta
Publisher: Springer Science & Business Media
ISBN: 3642345190
Category : Science
Languages : en
Pages : 533
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Book Description
Biofuels are considered to be the main potential replacement for fossil fuels in the near future. In this book international experts present recent advances in biofuel research and related technologies. Topics include biomethane and biobutanol production, microbial fuel cells, feedstock production, biomass pre-treatment, enzyme hydrolysis, genetic manipulation of microbial cells and their application in the biofuels industry, bioreactor systems, and economical processing technologies for biofuel residues. The chapters provide concise information to help understand the technology-related implications of biofuels development. Moreover, recent updates on biofuel feedstocks, biofuel types, associated co- and byproducts and their applications are highlighted. The book addresses the needs of postgraduate researchers and scientists across diverse disciplines and industrial sectors in which biofuel technologies and related research and experimentation are pursued.
Author: Manish Srivastava
Publisher:
ISBN: 9783030147273
Category : Cellulase
Languages : en
Pages :
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Book Description
Cellulase is a key enzyme of industrial interest and plays a crucial role in the hydrolysis of cellulose, a prime component of plant cell walls. Cellulase covers a broad area in the global market of industrially important enzymes and it is considered as the third largest industrial enzyme globally. Additionally, cellulase contributes about 20% of the total enzyme market globally because of its massive demand in various industries such as in biofuel production, pulp, paper, textile, food, and beverages, as well as in detergent industries. Among these, the demand of cellulase may become frequently selected in the commercial production of biofuels in the future and thus will further increase demand of cellulase in the biofuel industry. Because biofuel production is still not realized in a cost-effective, practical implementation due to its high cost (the higher cost of biofuels is due to higher production costs of enzymes), there is a need to introduce these types of approaches, which will help to lower the cost of enzyme production for developing overall economic biofuel production.
Author: Deepak K. Tuli
Publisher: Elsevier
ISBN: 0128218967
Category : Technology & Engineering
Languages : en
Pages : 416
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Book Description
Current Status and Future Scope of Microbial Cellulases not only explores the present and future of cellulase production, it also compares solid state fermentation (SSF) and submerged fermentation (SMF) for cellulase production. Chapters explore bioprocess engineering, metabolic engineering and genetic engineering approaches for enhanced cellulase production, including the application of cellulase for biofuel production. This important resource presents current technical status and the future direction of advances in cellulase production, including application of cellulases in different sectors. Covers the present industrial scenarios and future prospect of cellulase production Describes the molecular structure of cellulase Explores genetic engineering, metabolic engineering and other approaches for improved cellulase production Includes different applications of cellulases, including their application in the bioenergy sector
Author: Marco Aurelio Dos Santos Bernardes
Publisher: BoD – Books on Demand
ISBN: 9533074787
Category : Technology & Engineering
Languages : en
Pages : 610
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Book Description
This book aspires to be a comprehensive summary of current biofuels issues and thereby contribute to the understanding of this important topic. Readers will find themes including biofuels development efforts, their implications for the food industry, current and future biofuels crops, the successful Brazilian ethanol program, insights of the first, second, third and fourth biofuel generations, advanced biofuel production techniques, related waste treatment, emissions and environmental impacts, water consumption, produced allergens and toxins. Additionally, the biofuel policy discussion is expected to be continuing in the foreseeable future and the reading of the biofuels features dealt with in this book, are recommended for anyone interested in understanding this diverse and developing theme.
Author: Jin Zhang
Publisher: Frontiers Media SA
ISBN: 2889663922
Category : Science
Languages : en
Pages : 182
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Book Description
Author: Paul William Wolski
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
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Book Description
Abstract Engineering and Identification of Ionic Liquid-Tolerant Cellulases for Biofuels Production by Paul William Wolski Doctor of Philosophy in Comparative Biochemistry University of California, Berkeley Professor Douglas S. Clark, Chair Cellulose for biofuels production presents both a great opportunity, in that cellulose is the world's most abundant source of organic material, but also a great challenge in that cellulosic material is highly crystalline and very recalcitrant to degradation. Cellulose is composed of glucose, and this glucose can serve as fermentation feedstock to biofuels in processes that are very well developed. This glucose could also be converted to hydrocarbons similar to diesel for easier commercial adoption. Before cellulase enzymes can degrade the cellulosic biomass, the biomass generally must be preteated to make the cellulose more accessible to the enzymes (i.e. less crystalline). Typically this involves acid or base treatment that only moderately affects the cellulose. Ionic liquids (ILs), which are organic salts that are liquid at or near room temperature, have the ability to dissolve cellulose by disrupting the hydrogen-bonding network that makes cellulose so strong. Ideally the cellulase enzymes would be active against dissolved cellulose. The theme of this research has been to combine the pretreatment step with the enzymatic hydrolysis step. The design of the research was as follows: Identify ionic liquids that can dissolve cellulose, while still supporting enzymatic activity and enzymes from nature that can withstand high ionic liquid concentrations. Then, use directed evolution to enhance the ionic liquid tolerance of cellulases and screen for variants that were indeed more IL-tolerant. Additionally, it was of interest to determine what happens to the enzymes, when inactivated by the ionic liquid. Do they unfold? Does the ionic liquid block the active site? All of these main objectives were achieved, to varying degrees, in this work. First, using GFP as a reporter protein for quickly measuring protein stability by GFP fluorescence, we identified the ionic liquid 1,3-Dimethylimidazolium dimethylphosphate (Mmim DMP) to support greater cellulase activity than other ionic liquids, including the more commonly used 1-Ethyl-3-methylimidazolium (Emim) acetate. Then, we found cellulases from hyperthermophiles, such as Pyrococcus furiosus, to be more stable in aqueous ionic liquid than cellulases from mesophilic organisms. A cellulase from this organism was active in up to 70% (w/w) Mmim DMP. Using DNA shuffling we generated a library of chimeric cellulase (cellobiohydrolase I or Cel7A) genes from several homologous genes. After screening a library of over 1200 variants, we identified two variants that were more stable than the native enzyme from Talaromyces emersonii. However, the degree of increase in stability was much less after both the wild type and variant enzyme were treated with exogenous glutamine cyclase to convert the N terminal glutamine to pyroglutamate. This post-translational modification occurs in T. emersonii. However, when the wild type and variant enzymes were expressed in Saccharomyces cerevisiae, this modification did not occur, and was confirmed via differential scanning calorimetry. We also used differential scanning calorimetry to determine that the ionic liquid Mmim DMP lowers the melting temperature of the enzyme, in some cases, below the assay temperature. For this reason, we concluded that the ionic liquid, in conjunction with the assay temperature, is working to inactivate the cellulase via global unfolding of the enzyme. In this work we showed that although enzymatic hydrolysis against dissolved cellulose, was not achieved, we successfully enhanced ionic liquid tolerance of cellulases via directed evolution and by selection of cellulases from extremophiles. We demonstrated a strong correlation between ionic liquid tolerance and thermotolerance. Finally, we confirmed that in directed evolution the winning variants are based directly off the screen used. In this case, evolving cellulases in a system that does not perform the native post-translational modification will not necessarily produce the same results in one that does. A future study using the same screening system thus should involve either the exogenous addition of the glutamine cyclase enzyme or endogenous production of the glutamine cyclase to make the screen as close to the production of the native host as possible.
Author: Sudhir P. Singh
Publisher: Elsevier
ISBN: 0128198214
Category : Technology & Engineering
Languages : en
Pages : 481
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Book Description
Advances in Enzyme Catalysis and Technologies intends to provide the basic structural and functional descriptions, and classification of enzymes. The scientific information related to the recombinant enzyme modifications, discovery of novel enzymes and development of synthetic enzymes are also presented. The translational aspects of enzyme catalysis and bioprocess technologies are illustrated, by emphasizing the current requirements and future perspectives of industrial biotechnology. Several case studies are included on enzymes for biofuels application, micro algal biorefineries, high-value bioactive molecules production and enzymes for environmental processes, such as enzymatic bioprocessing for functional food development, biocatalytic technologies for the production of functional sweetener, etc. Provides a conceptual understanding of enzyme catalysis, enzyme engineering, discovery of novel enzymes, and technology perspectives Includes comprehensive information about the inventions and advancement in enzyme system development for biomass processing and functional food developmental aspects Gives an updated reference for education and understanding of enzyme technology
Author: Keikhosro Karimi
Publisher: Springer
ISBN: 3319140337
Category : Technology & Engineering
Languages : en
Pages : 334
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Book Description
This volume provides the technical information required for the production of biofuels and chemicals from lignocellulosic biomass. It starts with a brief overview of the importance, applications, and production processes of different lignocellulosic products. Further chapters review the perspectives of waste-based biofuels and biochemicals; the pretreatment of lignocellulosic biomass for biofuel production; cellulolytic enzyme systems for the hydrolysis of lignocelluloses; and basic and applied aspects of the production of bioethanol, biogas, biohydrogen, and biobutanol from lignocelluloses. This book is recommended for researchers and engineers and particularly students taking biofuel courses at graduate level.
