Extraction, fractionation, and characterization of structural polysaccharides from wheat straw.

Lawther, J. M.; Sun, Run‐Cang; Banks, W. B.

doi:10.1021/jf00051a021

Cited by 199 publications

(93 citation statements)

References 32 publications

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“…Lignins from the black liquors were isolated and submitted to nitrobenzene oxidation, according to Lawther et al (1995). Product quantification was performed by HPLC using a C 18 column and eluting with acetonitrile/water (1:8 v/v) with 1% acetic acid.…”

Section: Methodsmentioning

confidence: 99%

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Seca

Domingues

2006

Pesq. agropec. bras.

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-The objective of this work was to evaluate the use of basic density and pulp yield correlations with some chemical parameters, in order to differentiate an homogeneous eucalyptus tree population, in terms of its potential for pulp production or some other technological applications. Basic density and kraft pulp yield were determined for 120 Eucalyptus globulus trees, and the values were plotted as frequency distributions. Homogenized samples from the first and fourth density quartiles and first and fourth yield quartiles were submitted to total phenols, total sugars and methoxyl group analysis. Syringyl/guaiacyl (S/G) and syringaldehyde/vanillin (S/V) ratios were determined on the kraft lignins from wood of the same quartiles. The results show the similarity between samples from high density and low yield quartiles, both with lower S/G (3.88-4.12) and S/V (3.99-4.09) ratios and higher total phenols (13.3-14.3 g gallic acid kg -1 ). Woods from the high yield quartile are statistically distinguished from all the others because of their higher S/G (5.15) and S/V (4.98) ratios and lower total phenols (8.7 g gallic acid kg -1 ). Methoxyl group and total sugars parameters are more adequate to distinguish wood samples with lower density.Index terms: Eucalyptus globulus, syringyl, guaiacyl, phenols, methoxyl group, kraft pulping. Densidade e rendimento em polpa celulósica e sua relação com alguns parâmetros químicos no eucaliptoResumo -O objetivo deste trabalho foi avaliar a aplicabilidade de correlações entre rendimento em polpa e densidade básica com alguns parâmetros químicos, para diferenciar uma população homogênea de árvores de eucalipto, em termos de capacidade de produção de polpa celulósica ou de outras aplicações. Determinou-se a densidade básica e o rendimento em polpa celulósica em 120 árvores de Eucalyptus globulus, e os resultados foram representados como distribuição de freqüências. Na madeira das árvores dos primeiro e quarto quartis de densidade e de rendimento, determinaram-se os teores de fenóis totais, açúcares totais e grupos metoxílicos. Nas respectivas ligninas kraft determinaram-se as razões seringilo/guaiacilo (S/G) e seringaldeído/vanilina (S/V). As amostras dos quartis de alta densidade e as de baixo rendimento foram semelhantes, ambas com baixos valores de S/V (3,99-4,09) e S/G (3,88-4,12) e os mais elevados teores de fenóis totais (13,3-14,3 g de ácido gálico por quilograma). As madeiras do quarto quartil de rendimento são estatisticamente distintas das outras, com as maiores razões S/G (5,15) e S/V (4,98) e os menores teores de fenóis totais (8,7 g de ácido gálico por quilograma). Os parâmetros grupos metoxílicos e açúcares totais são os mais adequados para a diferenciação das amostras provenientes do primeiro quartil de densidade.

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Section: Methodsmentioning

confidence: 99%

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Seca

Domingues

2006

Pesq. agropec. bras.

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“…Currently, alkaline extraction, alkaline peroxide extraction, liquid hot water extraction, and steam explosionbased extraction technologies are widely used to isolate hemicelluloses from lignocelluloses . Hemicelluloses from most agricultural residues, such as wheat straw, sugarcane bagasse, and rice straw, have been extracted for the purpose of structural characterization (Lawther et al 1995;Sun et al 2004Sun et al , 1996. After the initial separation, the hemicelluloses obtained are subjected to further fractionation such as successive solvent precipitation (e.g., aqueous ethanol and aqueous ammonium sulfate), chromatograph separation (e.g., ion-exchange and gel-permeation), and membrane separation (e.g., ultrafiltration and nanofiltration) (Ebringerova 2012;Egues et al 2012;Schlesinger et al 2006).…”

Section: Graded Ethanol Fractionation and Structural Characterizationmentioning

confidence: 99%

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Peng¹,

Bian²,

Li³

et al. 2013

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Dewaxed Olea europaea L. was subjected to delignification followed by alkali extraction with 10% KOH containing 1% H 3 BO 3 . The released hemicelluloses were fractionated by precipitation through acidification and ethanol solutions with increasing concentrations from 20 to 30, 40, 50, 60, 70, and 90%. The structure of the subfractions obtained was comparatively characterized by sugar analysis, molecular weight, FT-IR, and NMR spectroscopy. Results indicated that 23.5% of hemicelluloses (% of the dewaxed material) were isolated by the alkaline extraction. An increase of ethanol concentration resulted in the precipitation of the more branched hemicelluloses as indicated by the increase of the ratios of arabinose to xylose and uronic acids to xylose. The hemicellulose subfractions Ha (precipitated by acidification to pH 5.5) and H30 (precipitated by 30% ethanol solution) had a similar structure, which was assumed to be glucuroxylan together with a small amount of α-glucan, whereas the hemicellulose subfraction H70 (precipitated by 70% ethanol solution) had a more complicated structure, which was mainly composed of a (1→4)-linked β-D-xylopyranosyl backbone with various side chains. The comprehensive structural characterization of the hemicelluloses of this species provides fundamental information for their potential applications in the fields of materials, chemicals, and energy production.

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“…Diverse techniques have been investigated for biomass fractionation including chemical, physicochemical, thermochemical, and biological methods (Lawther et al 1995;Huijgen et al 2010;Karp et al 2014;Saito et al 2014; Van den Bosch et al 2015). The alkaline oxidative method is one of the most attractive strategies because it is versatile, low cost, nontoxic, and environmentally friendly (Azarpira et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Fractionation and Characterization of Three Main Components from Pennisetum sinese Roxb. (P. sinese) by Microwave-assisted H2O2-NaOH Extraction

Tian¹,

Chen²,

Ji³

et al. 2017

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Fractionation of lignocellulosic components is a prerequisite for maximizing valorization of plant biomass in an integrated biorefinery. In this study, microwave-assisted H2O2-NaOH extraction was developed for fractionation of Pennisetum sinese Roxb. (P. sinese), a highly productive energy crop. Different reaction conditions including solid-liquid ratio, NaOH concentration, H2O2 concentration, temperature, and time were tested for their effects on P. sinese fractionation. The cellulose, hemicellulose, and lignin obtained under optimal fractionation conditions were characterized by Fourier transform infrared spectrometry (FT-IR) and nuclear magnetic resonance (NMR). The optimal fractionation conditions were a solid-liquid ratio of 1:25 using 0.5% H2O2 and 4% NaOH at 75 °C for 4 h, which gave cellulose, hemicellulose, and lignin yields of 42.8%, 21.9%, and 15.2%, respectively. FT-IR and NMR analyses of the fractionated components clearly confirmed their structural integrity and representation. The work demonstrates the potential of the alternative approach for efficient fractionation of lignocellulosic biomass components for further valorization.

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Extraction, fractionation, and characterization of structural polysaccharides from wheat straw.

Cited by 199 publications

References 32 publications

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Fractionation and Characterization of Three Main Components from Pennisetum sinese Roxb. (P. sinese) by Microwave-assisted H2O2-NaOH Extraction

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