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Open AccessJournal ArticleDOI

Toward an aggregated understanding of enzymatic hydrolysis of cellulose: noncomplexed cellulase systems.

Yi-Heng Percival Zhang, +1 more
- 30 Dec 2004 - 
- Vol. 88, Iss: 7, pp 797-824
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TLDR
It is suggested that it is timely to revisit and reinvigorate functional modeling of cellulose hydrolysis and that this would be highly beneficial if not necessary in order to bring to bear the large volume of information available on cellulase components on the primary applications that motivate interest in the subject.
Abstract
Information pertaining to enzymatic hydrolysis of cellulose by noncomplexed cellulase enzyme systems is reviewed with a particular emphasis on development of aggregated understanding incorporating substrate features in addition to concentration and multiple cellulase components. Topics considered include properties of cellulose, adsorption, cellulose hydrolysis, and quantitative models. A classification scheme is proposed for quantitative models for enzymatic hydrolysis of cellulose based on the number of solubilizing activities and substrate state variables included. We suggest that it is timely to revisit and reinvigorate functional modeling of cellulose hydrolysis, and that this would be highly beneficial if not necessary in order to bring to bear the large volume of information available on cellulase components on the primary applications that motivate interest in the subject.

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Citations
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Journal ArticleDOI

Pretreatments to enhance the digestibility of lignocellulosic biomass

TL;DR: Steam pretreatment, lime pret treatment, liquid hot water pretreatments and ammonia based Pretreatments are concluded to be pretreatment with high potentials, providing an improved accessibility of the cellulose for hydrolytic enzymes.
Journal ArticleDOI

Pretreatment technologies for an efficient bioethanol production process based on enzymatic hydrolysis: A review

TL;DR: This paper reviews the most interesting technologies for ethanol production from lignocellulose and it points out several key properties that should be targeted for low-cost and advanced pretreatment processes.
Journal ArticleDOI

Cellulose crystallinity index: measurement techniques and their impact on interpreting cellulase performance

TL;DR: Four different techniques incorporating X-ray diffraction and solid-state 13C nuclear magnetic resonance (NMR) were compared using eight different cellulose preparations and it was found that the simplest method, which is also the most widely used, and which involves measurement of just two heights in the X- Ray diffractogram, produced significantly higher crystallinity values than did the other methods.
Journal ArticleDOI

Trends in biotechnological production of fuel ethanol from different feedstocks.

TL;DR: The different technologies for producing fuel ethanol from sucrose-containing feedstocks (mainly sugar cane, starchy materials and lignocellulosic biomass) are described along with the major research trends for improving them.
Journal ArticleDOI

Outlook for cellulase improvement: screening and selection strategies.

TL;DR: In this paper, the authors review quantitative cellulase activity assays using soluble and insoluble substrates, and focus on their advantages and limitations, and hypothesize that continuous culture using insoluble cellulosic substrates could be a powerful selection tool for enriching beneficial cellulase mutants from the large library displayed on the cell surface.
References
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Journal ArticleDOI

Hydrolysis of lignocellulosic materials for ethanol production: a review.

TL;DR: Simultaneous saccharification and fermentation effectively removes glucose, which is an inhibitor to cellulase activity, thus increasing the yield and rate of cellulose hydrolysis, thereby increasing the cost of ethanol production from lignocellulosic materials.
Journal ArticleDOI

Microbial cellulose utilization: fundamentals and biotechnology.

TL;DR: A concluding discussion identifies unresolved issues pertaining to microbial cellulose utilization, suggests approaches by which such issues might be resolved, and contrasts a microbially oriented cellulose hydrolysis paradigm to the more conventional enzymatically oriented paradigm in both fundamental and applied contexts.
Journal ArticleDOI

Dissolution of Cellose with Ionic Liquids

TL;DR: In this paper, the authors demonstrate that cellulose can be dissolved without activation or pretreatment in, and regenerated from, 1-butyl-3-methylimidazolium chloride and other hydrophilic ionic liquids.
Journal ArticleDOI

A classification of glycosyl hydrolases based on amino acid sequence similarities.

TL;DR: With the steady increase in sequence and structural data, it is suggested that the enzyme classification system should perhaps be revised.
BookDOI

Wood: chemistry, ultrastructure, reactions.

TL;DR: The anatomy and chemistry of wood are described in detail, and with extensive reference to the literature, under the following headings: Introduction; Structure and ultrastructure; Chemical composition and analysis of wood; Cellulose; Polyoses (hemicelluloses); Lignin; Extractives; Distribution of the components within the wood cell wall; Constituents of bark; Reactions in acidic medium; reactions in alkaline medium; Influence of temperature; Degradation by light and ionizing rays; Microbial and enzymatic degradation; Aging and fossilization; Pul
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