Alkaline hydrogen peroxide pretreatment of softwood: Hemicellulose degradation pathways

Alvarez-Vasco, Carlos; Zhang, Xiao

doi:10.1016/j.biortech.2013.10.020

Cited by 84 publications

(58 citation statements)

References 24 publications

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“…To avoid excess alkali in the enzyme hydrolysis reaction, the pretreated hydrolysate/liquor from sodium hydroxide was not added as it compromised yields during enzymatic hydrolysis. An earlier study has reported the removal of hemicellulose and lignin in softwood during alkaline pretreatment [17]. NMR results endorsed the presence of furfurals that may have resulted from hemicellulose conversion during the acid hydrolysate Other researchers too have reported the occurrence of furfural during acid pretreatment [18].…”

Section: Effect Of Hemp Biomass Saccharificationmentioning

confidence: 88%

Understanding physicochemical changes in pretreated and enzyme hydrolysed hemp (Cannabis sativa) biomass for biorefinery development

Abraham

Vongsvivut

Barrow

et al. 2015

Biomass Conv. Bioref.

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The physicochemical properties of hemp biomass structure to pretreatment and enzymatic hydrolysis were investigated to improve upon reducing sugar production for biofuel development. Sodium hydroxide pretreated biomass (SHPB) yielded maximum conversion of holocellulose into reducing sugar (72 %). Scanning electron microscopy (SEM) revealed that enzymatic hydrolysis generated regular micropores in the fragmented biomass structure. The thermogravimetric analysis (TGA) curve suggested the degradation of hemicellulose and cellulose, which conformed well to the subsequent nuclear magnetic resonance (NMR) studies indicating the presence of α-and β-glucose (28.4 %) and α-and β-xylose (10.7 %), the major carbohydrate components commonly found in hydrolysis products of hemicellulose and cellulose. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectra showed stretching modes of the lignin acetyl group, suggesting the loosening of the polymer matrix and thus the exposure of the cellulose polymorphs. X-ray diffraction pattern indicated that enzymatic hydrolysis caused a higher crystallinity index (36.71), due to the fragmentation of amorphous cellulose leading to the reducing sugar production suitable for biofuel development.

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Section: Effect Of Hemp Biomass Saccharificationmentioning

confidence: 88%

Understanding physicochemical changes in pretreated and enzyme hydrolysed hemp (Cannabis sativa) biomass for biorefinery development

Abraham

Vongsvivut

Barrow

et al. 2015

Biomass Conv. Bioref.

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“…1B). Alvarez-Vasco and Zhang reported that the degradation of hemicellulose in high temperature was due to thermal instability of hemicelluloses (Alvarez-Vasco & Zhang, 2013). An evident loss of hemicelluloses was started at 150°C in MBSP process.…”

Section: Removal Of the Lignocellulosic Components During Pretreatmentmentioning

confidence: 98%

A new magnesium bisulfite pretreatment (MBSP) development for bio-ethanol production from corn stover

Ren

Лю

et al. 2016

Bioresource Technology

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“…Another advantage of alkaline pretreatments is the removal of uronic acid, which is mainly responsible for inhibiting cellulose accessibility in enzymatic saccharification . Moreover, alkaline treatment increases the biodegradability of the cell walls due to the breakage of lignin bonds with hemicellulose and cellulose …”

Section: Classification Of Pretreatmentsmentioning

confidence: 99%

A review of the potential of pretreated solids to improve gas biofuels production in the context of an OFMSW biorefinery

Romero-Cedillo

Poggi‐Varaldo

Ponce-Noyola³

et al. 2016

J. Chem. Technol. Biotechnol.

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The organic fraction of municipal solid waste (OFMSW), mainly composed of lignocellulosic polymers, is extremely complex. Therefore, it is necessary to apply pretreatments to remove the lignin content and decrease the cellulose crystallinity in order to use the OFMSW for gas biofuels production in the context of biorefineries from waste. This work focused on critically reviewing the conventional pretreatments applied to OFMSW, with the goal of improving the H 2 production, as well as other biofuels in modern biorefineries. There are a wide variety of pretreatments that have successfully been used, mainly alkaline, milling and dilute acid. In addition, some research has focused on the recovery and reutilization of the alkali, acid or solvents after the pretreatment, to be incorporated into new cycles of production, minimizing the environmental impacts. Moreover, it would be necessary to incorporate analytical tools, in order to determine the sustainability of the biorefinery project. It is concluded that waste pretreatments could significantly contribute to increased yields of biogas fuels in organic waste-based biorefineries. Therefore, establishing preliminary stages for conditioning biomass or wastes is essential to improve the degradation of wastes and bio-product generation. 938 www.soci.org L Romero-Cedillo et al. db dry basis wb wet basis wrm wet reactor mass J Chem Technol Biotechnol 2017; 92: 937-958 /jctb , [56.76 j , 2.53 k ] 104 J Chem Technol Biotechnol 2017; 92: 937-958 Steam explosion Steam explosion, also known as hydrothermal, promotes the formation of soluble lignin compounds, such as HMF, due to high temperatures that stimulate the breakdown of sugars. 121 In this process, HMF and other inhibitor compounds are generated, such as furans from pentoses and HMF from hexoses. 122 Interestingly, HMF can be finally degraded into levulinic and formic acids. In contrast, even when a pretreatment did not necessarily remove lignin, it was hypothesized that high temperatures had a significant J Chem Technol Biotechnol 2017; 92: 937-958 /jctb J Chem Technol Biotechnol 2017; 92: 937-958

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Alkaline hydrogen peroxide pretreatment of softwood: Hemicellulose degradation pathways

Cited by 84 publications

References 24 publications

Understanding physicochemical changes in pretreated and enzyme hydrolysed hemp (Cannabis sativa) biomass for biorefinery development

Understanding physicochemical changes in pretreated and enzyme hydrolysed hemp (Cannabis sativa) biomass for biorefinery development

A new magnesium bisulfite pretreatment (MBSP) development for bio-ethanol production from corn stover

A review of the potential of pretreated solids to improve gas biofuels production in the context of an OFMSW biorefinery

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