Effect of autohydrolysis on Pinus radiata wood for hemicellulose extraction

Santos, Tamara M.; Alonso, M. Virginia; Oliet, Mercedes; Domínguez, Juan C.; Rigual, Victoria; Rodrı́guez, Francisco

doi:10.1016/j.carbpol.2018.04.010

Cited by 34 publications

(29 citation statements)

References 52 publications

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“…confirmed this increment in C‐C bonds and the reduction of β ‐O‐4 linkages in lignin after AH pretreatment of aspen wood. Furthermore, the modification of this lignin, which remains in autohydrolyzed wood, was reported in a previous work …”

Section: Resultssupporting

confidence: 58%

“…In this first pretreatment (AH), acidic pH is produced by hemicellulose degradation to organic acid. Under severe conditions of AH, a higher concentration of degradation products such as AA and FA causes a reduction in the pH of AH liquors to low values near 3.0, as previously described . These acidic conditions promote formation of the benzylic carbocation at the C α position in the aliphatic chain, which leads to cleavage of the β ‐O‐4 bond.…”

Section: Resultsmentioning

confidence: 63%

“…The AH step of P. radiata was carried out in agreement with the results of a previous work, in which the effect of temperature and time of AH on the extraction of hemicelluloses of this wood was studied by experimental design. The low, medium and high design conditions were selected for the current study to analyze the influence of the AH step on the ORG and the enzymatic hydrolysis.…”

Section: Resultsmentioning

confidence: 83%

“…The pH value rose from 4.0 to 4.6 with the increment of the AH severity factor from S 0 = 2.95 (AH 150 ‐ORG 200 ) to S 0 = 4.60 (AH 190 ‐ORG 200 ). This increase can be explained by the extraction and solubilization of hemicellulose of P. radiata wood produced during this AH step . The hemicelluloses are initially extracted during the first step (AH), and therefore the removal of this polymer during the second step (ORG) is limited.…”

Section: Resultsmentioning

confidence: 99%

“…The solid phase (autohydrolyzed wood) was washed with water and withdrawn until its use in the following step (ORG). The operating conditions of the AH step (Table ) were selected based on results obtained in a previous study of hemicellulose extraction from P. radiata …”

Section: Methodsmentioning

confidence: 99%

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Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Santos

Rigual

Oliet

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Lignocellulosic biomass is a promising renewable feedstock to obtain fuels and chemicals. However, a suitable pretreatment is required to separate its main components and overcome its structural resistance to enzymatic hydrolysis. In this work, a sequential pretreatment composed of autohydrolysis (AH) and organosolv delignification (ORG) is used to fractionate Pinus radiata wood and improve the enzymatic hydrolysis. RESULTS The effect of three different AH pretreatment severities on the delignification degree of organosolv solid fractions was evaluated. In addition, enzymatic hydrolysis was performed to determine the efficiency of the combination of pretreatments. The results showed that a pretreated solid with high cellulose content (88%, w/w) and high delignification degree (88%) was achieved under mild conditions of AH (150 °C and 30 min) and acid‐catalyzed ORG (185 °C, 75 min, 50% (w/w) ethanol and 1% (w/w) sulfuric acid), obtaining an enzymatic hydrolysis yield of 63%. CONCLUSION This study provides the most favorable conditions to fractionate a softwood, P. radiata, employing a two‐step pretreatment based on AH followed by ORG. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Santos

Rigual

Oliet

et al. 2019

J of Chemical Tech & Biotech

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Sequential Fractionation of Lignocellulosic Biomass Using CO₂‐Assisted Hydrolysis Combined with γ‐Valerolactone Treatment

et al. 2019

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A biomass biorefinery strategy for the selective fractionation of poplar into its three main compositions (hemicellulose sugars, lignin, and high‐purity cellulose) with a two‐step process is developed. The first step consists of the selective hydrolysis of hemicellulose at mild conditions in a CO2/H2O system. This leads to various hemicellulose sugars and other intermediates in the water‐soluble fraction, with more than 87.90% of the hemicellulose being extracted from the original poplar (180 °C, 2.0 MPa CO2, 10 min). The pretreated sample is subsequently used for extracting lignin in a γ‐valerolactone (GVL)/H2O with acid catalysts for the next step. Meanwhile, four acid catalysts, including sulfuric acid and solid heteropoly acids (phosphomolybdic acid, silicotungstic acid, and phosphotungstic acid), are studied for the selective delignification in the GVL/H2O system, resulting in more than 91.35% of the original lignin being removed in the cellulose‐rich substrates (140 °C, 30 mM silicotungstic acid, 3 h). Overall, the biorefinery approach fractions the poplar wood into three primary components: 1) various oligosaccharides, monosaccharides, and other intermediates derived from hemicellulose; 2) cellulose‐rich substrate with a purity of cellulose as high as 90.76%, which has great potential as biochemicals or biomaterials; and 3) high‐purity and proportion lignin recovered from biomass.

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Effect of microwave‐assisted alkali pre‐treatment on fractionation of pistachio shell and enzymatic hydrolysis of cellulose‐rich residues

Özbek

Yanık

Fadı́loğlu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUNDPistachio shell is a lignocellulosic biomass with a high potential to be converted into chemicals, biopolymers, and biofuels. Alkaline pre‐treatment is an effective way to extract hemicellulose and increase the cellulose hydrolysis. However, there are some disadvantages to this process, such as a long processing time and the formation of high amounts of degradation products. Microwave irradiation can be used to enhance the effectiveness of alkaline treatment. In this study, microwave‐assisted alkali pre‐treatment (MAAP) was carried to fractionate pistachio shell into its valuable components (i.e., hemicellulose and cellulose), and the enzymatic hydrolysis of cellulose‐rich residues was performed to produce fermentable sugars.RESULTSThe MAAP conditions (microwave power, NaOH concentration, and pre‐treatment time) were studied and optimized by Box–Behnken design to obtain the highest hemicellulose and cellulose yields. Optimal pre‐treatment conditions were microwave power of 224 W, NaOH concentration of 1.96 N, and pre‐treatment time of 2.63 min. Under these conditions, the recoveries were 58.35% and 92.46% for hemicellulose and cellulose, respectively. Additionally, compositional analysis carried out on the solid and liquid fractions obtained from the pre‐treatments indicated that the main components in the liquid phases were xylooligosaccharides (XOS) and the solid phases were enriched in cellulose. MAAP enhanced the enzymatic hydrolysis yield, and a maximum glucan to glucose conversion yield of 82.67 mol% was obtained for the solid pre‐treated under optimum conditions.CONCLUSIONThe studied MAAP process could be an effective and viable option to extract hemicellulose from pistachio shell and increase the enzymatic digestibility of cellulose‐rich solid residues. © 2020 Society of Chemical Industry (SCI)

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Effect of autohydrolysis on Pinus radiata wood for hemicellulose extraction

Cited by 34 publications

References 52 publications

Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Sequential Fractionation of Lignocellulosic Biomass Using CO₂‐Assisted Hydrolysis Combined with γ‐Valerolactone Treatment

Effect of microwave‐assisted alkali pre‐treatment on fractionation of pistachio shell and enzymatic hydrolysis of cellulose‐rich residues

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Effect of autohydrolysis on Pinus radiata wood for hemicellulose extraction

Cited by 34 publications

References 52 publications

Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Two‐step fractionation of Pinus radiata by autohydrolysis and organosolv delignification for enzymatic hydrolysis

Sequential Fractionation of Lignocellulosic Biomass Using CO2‐Assisted Hydrolysis Combined with γ‐Valerolactone Treatment

Effect of microwave‐assisted alkali pre‐treatment on fractionation of pistachio shell and enzymatic hydrolysis of cellulose‐rich residues

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Sequential Fractionation of Lignocellulosic Biomass Using CO₂‐Assisted Hydrolysis Combined with γ‐Valerolactone Treatment