Fractionation of wheat and barley straw to access high-molecular-mass hemicelluloses prior to ethanol production

Persson, Thomas; Ren, Jie; Joelsson, Elisabeth; Jönsson, Ann‐Sofi

doi:10.1016/j.biortech.2009.02.063

Cited by 75 publications

(37 citation statements)

References 31 publications

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“…Sin embargo, el incremento de la fracción A de la FDA (P<0.05) no se explica fácilmente, porque la celulosa permanece insoluble después del tratamiento con vapor (47,48) . Además, la degradación de la celulosa ocurre cuando se utilizan presiones por encima de 28 kg -1 cm 2 (46) , que es superior a las presiones utilizadas en el presente estudio.…”

Section: Cinética De La Digestión In Situunclassified

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Composición química, digestibilidad y cinética ruminal de la digestión de residuos agrícolas tratados con explosión de vapor

Gutiérrez

Martínez²,

Vega

et al. 2018

Rev. Mex. Cienc. Pecu.

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RESUMENPara determinar el efecto de la explosión de vapor (EXPV) en la composición y digestibilidad de forrajes toscos (F) se condujeron dos experimentos. En el Exp 1, con un diseño factorial de presión (P; 10.3, 13.8 y 17.2 kg cm 2 ) y tiempo (T; 5, 10 y 15 min), se determinaron los cambios en pH, fracciones de fibra (FF) y la digestibilidad in vitro (DIVMS) del rastrojo de sorgo (RS), rastrojo de maíz (RM) y bagazo de caña (BZC) por efecto de EXPV. En el Exp 2, se comparó la cinética de la digestión in situ (CDI) de forrajes sin tratar y tratados con EXPV, RS y RM fueron tratados con 13.8 kg/cm 2 por 10 min y BZC con 17.2 kg/cm 2 por 15 min. Se incubaron muestras de forraje en rumen hasta por 120 h. Los datos fueron ajustados a un modelo no lineal. P y T no interactuaron en pH o FF. El aumento en P o T redujeron el pH, FDN y la hemicelulosa. La lignina y FDA no cambiaron dentro los niveles de P o T. En DIVMS, P*F y T*F fueron significativas. EXPV incrementó las fracciones soluble y potencialmente digestible y extensión de digestión de FF de los tres forrajes. Exceptuando para BCZ, el tiempo de retraso no cambió para FF. La respuesta de la tasa de digestión fue variable para FF o forraje. Se concluye que la EXPV mejora la calidad nutritiva de los forrajes toscos por solubilizar parte de la pared celular, acelerar la tasa de digestión e incrementar la extensión de la digestión. PALABRAS CLAVE: Explosión de vapor, Forrajes toscos, Fibra, Digestibilidad, Cinética digestiva. ABSTRACTTwo experiments were conducted to determine the effects of steam explosion (STE) on chemical composition and digestibility of the following forages (F): sorghum stover (SOS), corn stover (COS) and sugarcane bagasse (SUB). The Exp 1 was conducted to determine the effects of STE on pH, fiber fractions (FF) and in vitro digestibility (IVDMD). Fifty four samples were generated using a RCB design with a 3*3*3 factorial treatment arrangement, where the factors were: pressure (P: 10.3, 13.8 and 17.2 kg/cm 2 ), time (T: 5, 10 and 15 min) and F (SOS, COS and SUB). In Exp 2, changes in the digestion kinetics were determined when using the combinations of P and T that maximized IVDMD; thus, SOS and COS were treated at 13.8 kg/cm 2 for 10 min, and SUB at 17.2 kg/ cm 2 for 15 min. The treated and non-treated samples were incubated in rumen for up to 120 h. Data were fitted to a nonlinear model. No significant interactions T*P or F*P*T were detected on pH or FF; however, as P or T increased, pH, NDF and hemicellulose decreased. Lignin or ADF were not affected by P or T. As for IVDMD concerns, P*F and F*T interactions were significant. STE increased soluble fraction and degree of F digestion. Only lag time of SUB was reduced by STE. The potential digestible fraction was reduced in SOS and COS. It was concluded that the changes in chemical composition and digestion kinetics are related mainly to cell wall solubilization by stem explosion.KEY WORDS: Steam-explosion, Crop residues, Fiber, Digestibility, Digestion kinetics. INTRODUCCIÓNCon base en la sup...

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Section: Cinética De La Digestión In Situunclassified

“…However, increasing the fraction A of the FDA (P<0.05) is not easily explained because the cellulose remains insoluble after treatment with steam (47,48) . Moreover, the degradation of cellulose occurs when using pressure above 28 kg-1 cm 2(46) , which is higher than the pressures used in this study.…”

Section: Kinetics Of In Situ Digestionmentioning

confidence: 99%

Composición química, digestibilidad y cinética ruminal de la digestión de residuos agrícolas tratados con explosión de vapor

Gutiérrez

Martínez²,

Vega

et al. 2018

Rev. Mex. Cienc. Pecu.

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“…The conversion of lignocellulosic feedstocks to advanced biofuels and other substances through a sugarplatform process includes a pretreatment stage to increase the liability of the cellulose to enzymatic hydrolysis [5].…”

Section: Introductionmentioning

confidence: 99%

Bioethanol production from sodium hydroxide – dilute sulfuric acid pretreatment of rice husk via simultaneous saccharification and fermentation

2017

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Abstract. Degradation of lignin from lignocellulosic biomass plays a main key role in converting of lignocelluloses to bioethanol. The pretreatment of lignocelluloses is needed to enhance the fermentable sugars production from enzymatic hydrolysis. This research studied the effect of dilute sulfuric acid pretreatment on the ethanol production using alkaline-dilute acid pretreatment. This research used two stages of the pretreatment process. The first stage used NaOH solution with ratio of rice husk and NaOH solution (1:10 w/v). On the second stage, five concentrations of sulfuric acid of 1 to 5% at temperature of 121 o C and various heating times (30-90 min) were investigated. The ethanol production from pretreated rice husk was conducted by the simultaneous saccharification and fermentation (SSF) for various SSF times of 72-160 hr. The experimental results indicated that an increase in concentration of sulfuric acid capable to destroy the lignocellulosic structure of rice husk. The highest value of cellulose content was achieved about 88.84 % for acid pretreated material at H 2 SO 4 concentration of 2% in 90 minutes. The lignin reduction ranged from 47.46% to 79.29%. The highest ethanol concentration obtained was 13.68 g/L for the SSF time of 120 hours and the sulfuric acid concentration of 3 %.

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“…The application of hemicelluloses has been studied in recent years, and estimated data show that the annual production of hemicelluloses worldwide reached about 60 billion tons (Xu et al 2006b). Examples of potential future applications of hemicelluloses are as health foods, bioethanol, and barrier films (Persson et al 2009). Hemicelluloses also have the ability to serve as emulsifiers, adhesives, thickeners, and stabilizers in health foods or decorative paints .…”

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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Fractionation of wheat and barley straw to access high-molecular-mass hemicelluloses prior to ethanol production

Cited by 75 publications

References 31 publications

Composición química, digestibilidad y cinética ruminal de la digestión de residuos agrícolas tratados con explosión de vapor

Composición química, digestibilidad y cinética ruminal de la digestión de residuos agrícolas tratados con explosión de vapor

Bioethanol production from sodium hydroxide – dilute sulfuric acid pretreatment of rice husk via simultaneous saccharification and fermentation

Fractional Isolation and Structural Characterization of Hemicelluloses from Soybean Hull

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