Radiation pretreatments of cellulose materials for the enhancement of enzymatic hydrolysis

Mamar, S.Ait Si; Hadjadj, Ahmed

doi:10.1016/1359-0197(90)90137-7

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…gamma rays, electron beam and microwaves can improve enzymatic hydrolysis of lignocelluloses. The combination of the radiation and other methods such as acid treatment can further accelerate enzymatic hydrolysis [ 69 , 70 ]. Irradiation has enhanced enzymatic degradation of cellulose into glucose.…”

Section: Pretreatment Methods For Lignocellulose Wastesmentioning

confidence: 99%

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Pretreatment of Lignocellulosic Wastes to Improve Ethanol and Biogas Production: A Review

Taherzadeh

2008

IJMS

2,187

1,089

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Lignocelluloses are often a major or sometimes the sole components of different waste streams from various industries, forestry, agriculture and municipalities. Hydrolysis of these materials is the first step for either digestion to biogas (methane) or fermentation to ethanol. However, enzymatic hydrolysis of lignocelluloses with no pretreatment is usually not so effective because of high stability of the materials to enzymatic or bacterial attacks. The present work is dedicated to reviewing the methods that have been studied for pretreatment of lignocellulosic wastes for conversion to ethanol or biogas. Effective parameters in pretreatment of lignocelluloses, such as crystallinity, accessible surface area, and protection by lignin and hemicellulose are described first. Then, several pretreatment methods are discussed and their effects on improvement in ethanol and/or biogas production are described. They include milling, irradiation, microwave, steam explosion, ammonia fiber explosion (AFEX), supercritical CO 2 and its explosion, alkaline hydrolysis, liquid hot-water pretreatment, organosolv processes, wet oxidation, ozonolysis, dilute-and concentrated-acid hydrolyses, and biological pretreatments.

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Section: Pretreatment Methods For Lignocellulose Wastesmentioning

confidence: 99%

“…Irradiation has enhanced enzymatic degradation of cellulose into glucose. However, pre-irradiation is more effective in air than in acid solution [ 70 ]. Kumakura and Kaetsu [ 71 ] studied the effect of irradiation for pretreatment of bagasse prior to its enzymatic hydrolysis.…”

Section: Pretreatment Methods For Lignocellulose Wastesmentioning

confidence: 99%

Pretreatment of Lignocellulosic Wastes to Improve Ethanol and Biogas Production: A Review

Taherzadeh

2008

IJMS

2,187

1,089

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“…Exposure of cellulosic residues such as sugarcane bagasse to gamma radiation also resulted in a substantial decrease in the degree of polymerisation of cellulose but with only a marginal increase in substrate hydrolysis 44 . However, a considerable improvement in the hydrolysis of wheat straw was obtained when gamma radiolysis was used in the presence of dilute sulfuric acid 45 . The best pretreatment options are those which combine elements of both physical and chemical methods 3,15,46 .…”

Section: Pretreatment Of Lignocellulosicsmentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

546

217

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Recebido em 16/8/02; aceito em 15/5/03Pretreatment of lignocellulosic materials is essential for bioconversion because of the various physical and chemical barriers that greatly inhibit their susceptibility to bioprocesses such as hydrolysis and fermentation. The aim of this article is to review some of the most important pretreatment methods developed to date to enhance the conversion of lignocellulosics. Steam explosion, which precludes the treatment of biomass with high-pressure steam under optimal conditions, is presented as the pretreatment method of choice and its mode of action on lignocellulosics is discussed. The optimal pretreatment conditions for a given plant biomass are defined as those in which the best substrate for hydrolysis is obtained with the least amount of soluble sugars lost to side reactions such as dehydration. Therefore, pretreatment optimization results from a compromise between two opposite trends because hemicellulose recovery in acid hydrolysates can only be maximized at lower pretreatment severities, whereas the development of substrate accessibility requires more drastic pretreatment conditions in which sugar losses are inevitable. To account for this heterogeneity, the importance of several process-oriented parameters is discussed in detail, such as the pretreatment temperature, residence time into the steam reactor, use of an acid catalyst, susceptibility of the pretreated biomass to bioconversion, and process design.

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“…By using this technique, it was achieved that the glucose yield of pretreated bagasse became double as compared to untreated one prior to its enzymatic hydrolysis [34]. It helps in improving enzymatic hydrolysis of LCB in the conversion of cellulose to glucose [35][36]. However, some of the irradiation techniques are quite expensive and not applicable for industrial application.…”

Section: Irradiationmentioning

confidence: 99%

Conversion of Lignocellulosic Biomass to Bioethanol: An Overview with a Focus on Pretreatment

Singh

Satapathy

2018

IJET

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The present review article aims to highlight various pretreatment technologies involved in the biochemical conversion of biomass to bioethanol from lignocellulosic biomass without the process modification. Pretreatment technologies are aimed to increase the enzyme susceptibility to the biomass for high yield of ethanol production through microbial fermentation. Broadly, pretreatment methods are divided into four categories including physical, chemical, physico-chemical and biological. This paper comprehensively reviewed on the lignocellulosic biomass to bioethanol process with focuses on pretreatment methods, their mechanisms, combination of different pretreatment technologies, the addition of external chemical agents, advantages, and disadvantages. It also discussed the ethanol productions from biomass in details without disturbing the process integrity.

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Radiation pretreatments of cellulose materials for the enhancement of enzymatic hydrolysis

Cited by 8 publications

References 8 publications

Pretreatment of Lignocellulosic Wastes to Improve Ethanol and Biogas Production: A Review

Pretreatment of Lignocellulosic Wastes to Improve Ethanol and Biogas Production: A Review

The chemistry involved in the steam treatment of lignocellulosic materials

Conversion of Lignocellulosic Biomass to Bioethanol: An Overview with a Focus on Pretreatment

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