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Green Biomass Pretreatment for Biofuels Production (SpringerBriefs in Molecular Science)

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Please re-enter recipient e-mail address es. AKK and SS designed and wrote the review. Both authors read and approved the final manuscript. All the authors have agreed to provide the data and material for open access. All the authors have approved the consent for publishing the manuscript. All the authors have read and agreed the ethics for publishing the manuscript. Adepu Kiran Kumar, Email: National Center for Biotechnology Information , U. Published online Jan Adepu Kiran Kumar and Shaishav Sharma.

Author information Article notes Copyright and License information Disclaimer. Received Oct 18; Accepted Jan This article has been cited by other articles in PMC. Abstract Lignocellulosic feedstock materials are the most abundant renewable bioresource material available on earth. Pretreatment, Lignocellulosic biomass, Cellulose, Lignin, Reducing sugars. Background Lignocellulosic feedstock represents an extraordinarily large amount of renewable bioresource available in surplus on earth and is a suitable raw material for vast number of applications for human sustainability.

Open in a separate window. Methods of pretreatment The pretreatment of lignocellulosic feedstocks is an essential step and is required to alter the structure of biomass residues and expose the lignocellulosic fractions for easy access to enzymes during enzymatic hydrolysis and enhance the rate and yield of reducing sugars Alvira et al. Milling Mechanical grinding milling is used for reducing the crystallinity of cellulose. Microwave Microwave irradiation is a widely used method for lignocellulosic feedstock pretreatment because of various reasons such as 1 easy operation, 2 low energy requirement, 3 high heating capacity in short duration of time, 4 minimum generation of inhibitors, and 5 degrades structural organization of cellulose fraction.

Ultrasound Sonication is relatively a new technique used for the pretreatment of lignocellulosic biomass. Pyrolysis Pyrolysis has also been employed for the pretreatment of lignocellulosic biomass, however, in biorefinery processes. Pulsed-electric field Pulsed-electric field PEF pretreatment exposes the cellulose present in the biomass by creating the pores in the cell membrane thereby allowing the entry of agents that will break the cellulose into constituent sugars. Chemical pretreatment Dilute acid Although acid treatment is the most commonly used conventional pretreatment method of lignocellulosic feedstocks, it is less attractive due to the generation of high amount of inhibitory products such as furfurals, 5-hydroxymethylfurfural, phenolic acids, and aldehydes.

Some of the commonly used acids are discussed here: Sulfuric acid The most common commercially used acid is dilute sulphuric acid H 2 SO 4. Mild-alkali In contrary to acid treatment, alkali pretreatment methods are in general performed at ambient temperature and pressure. Ozonolysis Ozone treatment is mainly used for reducing the lignin content of lignocellulosic biomass as it mainly degrades lignin but negligibly affects hemicellulose and cellulose Kumar et al.

Organosolv This process involves addition of aqueous organic solvents such as ethanol, methanol, ethylene glycol, acetone etc. Ionic liquids Ionic liquids have received great attention in last decade for the pretreatment of lignocellulosic biomass. Deep eutectic solvents These are relatively a new class of solvents having many characteristics similar to ionic liquids.

Natural deep eutectic solvents In the recent past, a large number of natural products have been brought into the range of ILs and DES. Physico-chemical pretreatment Steam explosion Steam pretreatment is one of the most commonly used physicochemical methods for pretreatment of lignocellulosic biomass.

CO 2 explosion This process carries out the pretreatment of biomass through supercritical CO 2 which means the gas behaves like a solvent. Oxidative pretreatment It involves treatment of lignocellulosic biomass by oxidizing agents such as hydrogen peroxide, ozone, oxygen or air Nakamura et al. Biological pretreatment In comparison to conventional chemical and physical pretreatment methods, biological pretreatment is considered as an efficient, environmentally safe and low-energy process.


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Microorganism Biomass Major effects References Punctualaria sp. Combined biological pretreatment Studies have found that a combination of another pretreatment process with biological pretreatment process is more effective as compared to a single pretreatment process. Applications of biomass pretreatment Biomass pretreatment results in production of several value-added products.

Biofuels Several biofuels are obtained through lignocellulosic biomass such as bio-oil, bioethanol, biohydrogen, biogas, syngas etc. Bioproducts The chemicals from lignocellulosic biomass can be derived either through carbohydrate source or through lignin. Conclusion The presence of lignin in the biomass inhibits the hydrolysis of cellulose and hemicellulose. Competing interests The authors declare that they have no competing interests. Availability of data and material All the authors have agreed to provide the data and material for open access. Consent for publication All the authors have approved the consent for publishing the manuscript.

Ethics approval and consent to participate All the authors have read and agreed the ethics for publishing the manuscript. Hydrothermal decomposition of various crystalline celluloses as treated by semi-flow hot-compressed water. Influence of ultrasound treatment on accessibility and regioselective oxidation reactivity of cellulose. Combined organosolv and ultrafiltration lignocellulosic biorefinery process. Agricultural palm oil tree residues as raw material for cellulose, lignin and hemicelluloses production by ethylene glycol pulping process. Pretreatment technologies for an efficient bioethanol production process based on enzymatic hydrolysis: Alkaline peroxide assisted wet air oxidation pretreatment approach to enhance enzymatic convertibility of rice husk.

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Evaluation of wet air oxidation as a pretreatment strategy for bioethanol production from rice husk and process optimization. Importance of chemical pretreatment for bioconversion of lignocellulosic biomass. Renew Sustain Energy Rev. The effect of combined chemical and enzyme treatment on the saccharification and in vitro digestion rate of wheat straw. Release of monomeric sugars from Miscanthus sinensis by microwave assisted ammonia and phosphoric acid treatments. Production of nanocrystalline cellulose from lignocellulosic biomass: Effect of ultrasound on lignocellulosic biomass as a pretreatment for biorefinery and biofuel applications.

Ind Eng Chem Res. Comparison of the effects of five pretreatment methods on enhancing the enzymatic digestibility and ethanol production from sweet sorghum bagasse. Biological pretreatment of Eucalyptus grandis sawdust with white-rot fungi: Biodelignification of lignocellulose substrates: Lime pretreatment of switchgrass. An overview of key pretreatment processes employed for bioconversion of lignocellulosic biomass into biofuels and value added products.

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Individualization of cellulose nanofibers from wood using high-intensity ultrasonication combined with chemical pretreatments. Disruption of sugarcane bagasse lignocellulosic structure by means of dilute sulfuric acid pretreatment with microwave-assisted heating. Evaluation of high solids alkaline pretreatment of rice straw. Biorefineries for the production of top building block chemicals and their derivatives. Evaluation of selected white-rot fungal isolates for improving the sugar yield from wheat straw. Enhancement of cellulose saccharification kinetics using an ionic liquid pretreatment step.

Natural deep eutectic solvents as new potential media for green technology. Alternative monomers based on lignocellulose and their use for polymer production.

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Two-stage pretreatment of rice straw using aqueous ammonia and dilute acid. Pretreatment and fractionation of corn stover by soaking in aqueous ammonia. Pretreatment of corn stover by ammonia recycle percolation process. Enhanced enzymatic saccharification of barley straw pretreated by ethanosolv technology. Structural changes in lignin during organosolv pretreatment of Liriodendron tulipifera and the effect on enzymatic hydrolysis.

Comparison of dilute mineral and organic acid pretreatment for enzymatic hydrolysis of wheat straw. Natural deep eutectic solvent mediated pretreatment of rice straw: Environ Sci Pollut Res Int. Methods for pretreatment of lignocellulosic biomass for efficient hydrolysis and biofuel production. Pulsed electric field pretreatment of switchgrass and woodchips species for biofuels production. Effects of cellulase and xylanase enzymes on the deconstruction of solids from pretreatment of poplar by leading technologies. Enhanced enzymatic hydrolysis of sugarcane bagasse by N methylmorpholine-N-oxide pretreatment.

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Comparative analysis of efficiency, environmental impact, and process economics for mature biomass refining scenarios. Scale-up study of oxalic acid pretreatment of agricultural lignocellulosic biomass for the production of bioethanol.


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