Fractional purification and bioconversion of hemicelluloses

Peng, Feng; Peng, Pai; Xu, Feng; Sun, Run‐Cang

doi:10.1016/j.biotechadv.2012.01.018

Cited by 364 publications

(226 citation statements)

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“…Among the different lignocellulosic materials, wheat straw is an economic agricultural by-product available at huge amounts with potentials for production of ethanol in view of its cellulose (33%) and hemicellulose (33%) dry weight contents (Canilha et al, 2006). It is worth quoting that various studies have been carried out on the pretreatment and hydrolysis of wheat straw (Talebnia et al, 2010;Baboukani et al, 2012;Peng et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

et al. 2016

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Please cite this article as: FazeliNejad S., Ferreira J.A., Brandberg T., Lennartsson P.R., Taherzadeh M.J. Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF). Biofuel Research Journal 9 (2016) SSFF can be used for production of ethanol and biomass from wheat straw.Glucose present in the feed controlled the assimilation of xylose and acetic acid.The fungal growth rate was found not to be influenced by the feed composition.Rhizopus biomass yields of up 0.34 g/g and ethanol yields of 0.40 g/g were obtained. The economic viability of the 2 nd generation bioethanol production process cannot rely on a single product but on a biorefinery built around it. In this work, ethanol and fungal biomass (animal feed) were produced from acid-pretreated wheat straw slurry under an innovative simultaneous saccharification, fermentation, and filtration (SSFF) strategy. A membrane unit separated the solids from the liquid and the latter was converted to biomass or to both biomass and ethanol in the fermentation reactor containing Rhizopus sp. pellets. Biomass yields of up to 0.34 g/g based on the consumed monomeric sugars and acetic acid were achieved. A surplus of glucose in the feed resulted in ethanol production and reduced the biomass yield, whereas limiting glucose concentrations resulted in higher consumption of xylose and acetic acid. The specific growth rate, in the range of 0.013-0.015/h, did not appear to be influenced by the composition of the carbon source. Under anaerobic conditions, an ethanol yield of 0.40 g/g was obtained. The present strategy benefits from the easier separation of the biomass from the medium and the fungus ability to assimilate carbon residuals in comparison with when yeast is used. More specifically, it allows in-situ separation of insoluble solids leading to the production of pure fungal biomass as a value-added product. ARTICLE INFO ABSTRACT © 2016 BRTeam. All rights reserved.Journal homepage: www.biofueljournal.com FazeliNejad et al. / Biofuel Research Journal 9 (2016) [372][373][374][375][376][377][378] Please cite this article as: FazeliNejad S., Ferreira J.A., Brandberg T., Lennartsson P.R., Taherzadeh M.J. Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF).

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Section: Introductionmentioning

confidence: 99%

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

et al. 2016

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“…Hemicelluloses are types of plant cell wall heteropolysaccharides, generally defined as polysaccharides that can be extracted by water or aqueous alkali from plant tissue (Peng et al 2012). Unlike cellulose, which consists of a single monomer, hemicelluloses are heteroglycans arranged in various proportions and with various sugar units (Sun et al 2005a).…”

Section: Introductionmentioning

confidence: 99%

“…Hemicelluloses are usually associated with lignin, cellulose, and protein in plant cell walls (Peng et al 2012). To improve the accessibility of hemicelluloses, it is necessary to remove the lignin.…”

Section: Introductionmentioning

confidence: 99%

Fractional Isolation and Structural Characterization of Hemicelluloses from Soybean Hull

Wang¹,

Li²,

Liu³

et al. 2015

BioResources

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Hemicellulosic fractions were extracted from soybean hull with various concentrations of NaOH at 50 °C for 5 h. The chemical compositions and physicochemical properties were determined by high performance anion exchange chromatography (HPAEC), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and 13 C and 2D nuclear magnetic resonance (NMR) analysis. The crystallinity of soybean hulls treated and untreated by alkali liquid was examined by X-ray diffraction (XRD). The sugar analysis results indicated that all of the hemicellulosic preparations were heteropolysaccharides containing arabinose, galactose, glucose, xylose, and mannose. According to the spectral analysis, hemicelluloses from soybean hull were assumed to be L-arabino-4-O-methyl-D-glucurono-D-xylan. Xylose was the predominant monosaccharide in the hemicellulose fraction 1 (H1), and it ranged between 40.1% and 48.8% of the total neutral sugars. It was found that hemicellulose fraction 3 (H3) had the highest thermal stability and H1 had the lowest thermal stability. The crystallinity index (CrI) was found to be about 20.8%, 14.3%, 10.9%, and 4.7% for soybean hulls, untreated and treated with 1.5, 2.0, and 2.5 M NaOH, respectively.

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“…47 Hemicelluloses are polysaccharides that are extracted from cell walls in alkaline solutions to break the hydrogen bonds that create attachments between the hemicelluloses and cellulose. 48 In addition, alkaline extractions will serve to hydrolyse any ester linkages, including diferulic acid cross-links commonly found in the cell walls of monocotyledonous plants, [48][49][50] 54 Many approaches have been developed to extract hemicelluloses in order to exploit their diverse characteristics and functionalities.…”

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confidence: 99%

“…48 In addition, alkaline extractions will serve to hydrolyse any ester linkages, including diferulic acid cross-links commonly found in the cell walls of monocotyledonous plants, [48][49][50] 54 Many approaches have been developed to extract hemicelluloses in order to exploit their diverse characteristics and functionalities. For example, industrially produced hemicelluloses are used as viscosity modifiers in food packaging films, 47 additives in paper manufacture, 55 in pharmaceuticals both as tablet binders 55 and to exploit their bioactive properties such as immunostimulatory and antitumor characteristics.…”

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confidence: 99%

Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

et al. 2016

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Fractional purification and bioconversion of hemicelluloses

Cited by 364 publications

References 283 publications

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

Fractional Isolation and Structural Characterization of Hemicelluloses from Soybean Hull

Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

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