Pretreatment of wheat straw using combined wet oxidation and alkaline hydrolysis resulting in convertible cellulose and hemicellulose

Bjerre, Anne Belinda; Olesen, Anne Bjerring; Fernqvist, Tomas; Plöger, A.; Schmidt, A.S.

doi:10.1002/(sici)1097-0290(19960305)49:5<568::aid-bit10>3.0.co;2-6

Cited by 277 publications

(110 citation statements)

References 22 publications

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“…The wet oxidation method can be used for fractionation of lignocellulosics into solubilized hemicellulose fraction and a solid cellulose fraction susceptible to enzymatic saccharification. Bjerre et al [3] found that a combination of alkali and wet oxidation did not generate furfural and 5-hydroxymethyl furfural (HMF). Klinke et al [67] characterized the degradation products from alkaline wet oxidation (water, sodium carbonate, oxygen, high temperature, and pressure) of wheat straw.…”

Section: Pretreatment Of Hemicellulosementioning

confidence: 99%

Hemicellulose bioconversion

Saha

2003

Journal of Industrial Microbiology and Biotechnology

1,706

814

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Various agricultural residues, such as corn fiber, corn stover, wheat straw, rice straw, and sugarcane bagasse, contain about 20-40% hemicellulose, the second most abundant polysaccharide in nature. The conversion of hemicellulose to fuels and chemicals is problematic. In this paper, various pretreatment options as well as enzymatic saccharification of lignocellulosic biomass to fermentable sugars is reviewed. Our research dealing with the pretreatment and enzymatic saccharification of corn fiber and development of novel and improved enzymes such as endo-xylanase, b-xylosidase, and a-L-arabinofuranosidase for hemicellulose bioconversion is described. The barriers, progress, and prospects of developing an environmentally benign bioprocess for large-scale conversion of hemicellulose to fuel ethanol, xylitol, 2,3-butanediol, and other valueadded fermentation products are highlighted.

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Section: Pretreatment Of Hemicellulosementioning

confidence: 99%

Hemicellulose bioconversion

Saha

2003

Journal of Industrial Microbiology and Biotechnology

1,706

814

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“…This type of pretreatment is effective at lignin degradation as well as hemicellulose solubilization (mainly as oligomers) resulting in a highly digestible pretreated solid fraction. This approach greatly reduces the amount of furfural and HMF produced if pH is controlled during pretreatment (Bjerre et al 1996).…”

Section: Pretreatmentmentioning

confidence: 99%

Role of pretreatment and conditioning processes on toxicity of lignocellulosic biomass hydrolysates

2009

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The Department of Energy's Office of the Biomass Program has set goals of making ethanol cost competitive by 2012 and replacing 30% of 2004 transportation supply with biofuels by 2030. Both goals require improvements in conversions of cellulosic biomass to sugars as well as improvements in fermentation rates and yields. Current best pretreatment processes are reasonably efficient at making the cellulose/hemicellulose/lignin matrix amenable to enzymatic hydrolysis and fermentation, but they release a number of toxic compounds into the hydrolysate which inhibit the growth and ethanol productivity of fermentation organisms. Conditioning methods designed to reduce the toxicity of hydrolysates are effective, but add to process costs and tend to reduce sugar yields, thus adding significantly to the final cost of production. Reducing the cost of cellulosic ethanol production will likely require enhanced understanding of the source and mode of action of hydrolysate toxic compounds, the means by which some organisms resist the actions of these compounds, and the methodology and mechanisms for conditioning hydrolysate to reduce toxicity. This review will provide an update on the state of knowledge in these areas and can provide insights useful for the crafting of hypotheses for improvements in pretreatment, conditioning, and fermentation organisms.

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“…However, the solubilization of lignin is relatively low demonstrating that hydrothermal treatment does not significantly interact with lignin. In fact, the values obtained are even lower than the reported for the autohydrolysis of corn cobs under similar operational conditions [36] and also lower than other reported pre-treatments, specially those including either alkaline or oxidative treatments [37,38].…”

Section: Effect Of Autohydrolysis On the Products Yieldsmentioning

confidence: 99%

Wheat Straw Autohydrolysis: Process Optimization and Products Characterization

Carvalheiro

Silva-Fernandes

Duarte

et al. 2008

Appl Biochem Biotechnol

200

120

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Wheat straw was subjected to autohydrolysis treatments in order to selectively hydrolyze the hemicellulose fraction. The effects of temperature (150-240 degrees C) and non-isothermal reaction time on the composition of both liquid and solid phases were evaluated and interpreted using the severity factor (log R0). The operational conditions leading to the maximum recovery of hemicellulose-derived sugars were established for log R0 = 3.96 and correspond to 64% of the original (arabino)xylan with 80% of sugars as xylooligosaccharides. Under these conditions, a solubilization of 58% xylan, 83% arabinan, and 98% acetyl groups occurred. Glucan was mainly retained in the solid phase (maximum solubilization 16%), which enables an enrichment of the solid phase to contain up to 61% glucan. Delignification was not extensive, being utmost 15%. The yields of soluble products, including sugars, acetic acid, and degradation compounds, such as, furfural, 5-hydroxymethylfurfural furfural obtained suggest the fitness of liquid stream for fermentation purposes or to obtain xylooligosaccharides with potential applications in food, pharmaceutical, and cosmetic industries.

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Pretreatment of wheat straw using combined wet oxidation and alkaline hydrolysis resulting in convertible cellulose and hemicellulose

Cited by 277 publications

References 22 publications

Hemicellulose bioconversion

Hemicellulose bioconversion

Role of pretreatment and conditioning processes on toxicity of lignocellulosic biomass hydrolysates

Wheat Straw Autohydrolysis: Process Optimization and Products Characterization

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