The Structural Characterization of Corn Stalks Hemicelluloses During Active Oxygen Cooking as a Pretreatment for Biomass Conversion

Shi, Jing; Yang, Qingxiang; Lin, Lu; Gong, Yan; Pang, Chunsheng; Xie, Tu-Jun

doi:10.15376/biores.7.4.5236-5246

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…Compared with the lignin, the cellulose suffered a limited amount of loss during this process. Despite the fact that the hemicellulose had a certain degree of loss, the reserved hemicellulose in the bamboo pulp (19.4%) was higher than that in the corn stalk (12.7%) and bagasse (13.1%) pulp by the same pretreatment process (Shi et al 2012a(Shi et al , 2012b. This higher hemicellulose content is beneficial for further applications to obtain a variety of high-value-added products, such as xylose, xylitol, and xylo-oligosaccharides (XOS), without being obstructed by undesirable lignin.…”

Section: Chemical Compositionmentioning

confidence: 90%

“…In a comparison between the molar ratio of Ara/Xyl of bamboo and of other typical biomass, it was found that the molar ratios of Ara/Xyl in the BSF and PSF were lower than that of bagasse and corn stalk (Table 3). This phenomenon suggested that the hemicellulose of bamboo residue is mainly composed of xylan (Shi et al 2012a;Shi et al 2012b). …”

Section: Yield and Monomer Compositions Of Different Hemicellulose Frmentioning

confidence: 98%

“…2, (left)). Our previous study described the active oxygen cooking process (Shi et al 2012a(Shi et al , 2012bYang et al 2012;Jiang et al 2017). The detailed operations were as follows: 1 kg of bamboo residue (oven-dried weight) and 150 g of MgO were placed in a 22 L rotating ball-shaped digester with a solid-to-liquid ratio of 1:5 (w/v) with 10 cm diameter circular feed port by manual.…”

Section: Raw Materials and Active Oxygen Cooking Processmentioning

confidence: 99%

“…However, this signal in the PSF was very weak, which indicated that most of the acetyl groups of the hemicellulose were split off during the cooking process. Additionally, the ester bonds (acetyl, uronic, and ferulic ester groups) were determined to have completely cleaved under the cooking conditions based on the signal disappearance at 1730 to 1740 cm -1 in all of the spectra (Sun et al 2004a;Peng et al 2012;Shi et al 2012a). The signal intensity in the BIF, BSF, and PIF was stronger than in the PSF, which might have been due to the higher xylose content in the former three, as was determined by the sugar analysis.…”

Section: Fig 3 Ft-ir Spectra Of the Four Kinds Of Hemicellulose Framentioning

confidence: 99%

“…Therefore, the CAOSA process with O2 and MgO could significantly reduce, and even eliminate the pollution caused by the cooking chemicals. In this process, active oxygen is used to remove the lignin, and the solid alkali, which is slightly soluble in water, provides a weak alkaline condition to support delignification and protect the carbohydrates from carbonizing and hydrolyzing (Shi et al 2012a). In comparison with other conventional cooking processes, the CAOSA process is an efficient and environmentally friendly biomass pretreatment method.…”

Section: Introductionmentioning

confidence: 99%

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Active Oxygen and Solid Alkali Pretreatment of Bamboo Residue: Features of Hemicellulose during the Cooking Process

Xiong

Luo

et al. 2017

BioRes

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Bamboo residue was treated with an active oxygen (O2) and solid alkali (MgO) (CAOSA) process, which was developed recently by the authors owing to its environmentally friendly and high-efficiency characteristics. During the cooking process, 93.0% of lignin and 62.1% of hemicellulose were removed from the raw material, which resulted in a cellulose-rich pulp. This indicated that this cooking process is efficient to fractionate the bamboo residue into cellulose, hemicellulose, and lignin as a pretreatment for biomass conversion. The structural features of the hemicellulose from the pretreated bamboo residue were analyzed for comparison with that of the raw materials. The molecular structure of the hemicellulose fractions obtained from both the raw bamboo and pulp consisted of a (1→4)-β-D-Xylp backbone substituted with α-L-Araf and 4-O-methyl-α-D-glucuronic acid. The hemicellulose with more side chains tended to be more easily removed from the bamboo cell wall during the CAOSA process. Furthermore, the fractions of hemicellulose exhibited much lower thermal stabilities after the cooking process than the raw material.

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Section: Chemical Compositionmentioning

confidence: 90%

Section: Yield and Monomer Compositions Of Different Hemicellulose Frmentioning

confidence: 98%

Section: Raw Materials and Active Oxygen Cooking Processmentioning

confidence: 99%

Section: Fig 3 Ft-ir Spectra Of the Four Kinds Of Hemicellulose Framentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active Oxygen and Solid Alkali Pretreatment of Bamboo Residue: Features of Hemicellulose during the Cooking Process

Xiong

Luo

et al. 2017

BioRes

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Bisulfite pretreatment changes the structure and properties of oil palm empty fruit bunch to improve enzymatic hydrolysis and bioethanol production

Tan

Sun

et al. 2015

Biotechnology Journal

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Bisulfite pretreatment is a proven effective method for improving the enzymatic hydrolysis of empty fruit bunch (EFB) from oil palm for bioethanol production. In this study, we set out to determine the changes that occur in the structure and properties of EFB materials and fractions of hemicellulose and lignin during the bisulfite pretreatment process. The results showed that the crystallinity of cellulose in EFB increased after bisulfite pretreatment, whereas the EFB surface was damaged to various degrees. The orderly structure of EFB, which was maintained by hydrogen bonds, was destroyed by bisulfite pretreatment. Bisulfite pretreatment also hydrolyzed the glycosidic bonds of the xylan backbone of hemicellulose, thereby decreasing the molecular weight and shortening the xylan chains. The lignin fractions obtained from EFB and pretreated EFB were typically G-S lignin, and with low content of H units. Meanwhile, de-etherification occurred at the β-O-4 linkage, which was accompanied by polymerization and demethoxylation as a result of bisulfite pretreatment. The adsorption ability of cellulase differed for the various lignin fractions, and the water-soluble lignin fractions had higher adsorption capacity on cellulase than the milled wood lignin. In general, the changes in the structure and properties of EFB provided insight into the benefits of bisulfite pretreatment.

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A Kinetic Study of DDGS Hemicellulose Acid Hydrolysis and NMR Characterization of DDGS Hydrolysate

Chen

Liu

2015

Appl Biochem Biotechnol

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Liquid hot water (LHW) extraction was used as a pretreatment method to separate the hemicellulose fraction from dried distiller's grain with solubles (DDGS) into liquid phase. Acid hydrolysis using 3.264 % w/w sulfuric acid at 130 °C was performed to convert polysaccharides in LHW extract to monosaccharides. The structure characterization of DDGS in anomeric carbon region based on proton NMR and heteronuclear single quantum coherence (HSQC) during acid hydrolysis was studied in this work. It reveals that the sugar units in DDGS hemicelluloses are constructed with (1-4)-β-D-xylopyranose and α-L-arabinofuranosyl residues. A kinetic model is included to explain the changing concentration of monomer, oligomer, and sugar units. The model was further tested based on the changing concentration of five carbon sugar units during hydrolysis.

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The Structural Characterization of Corn Stalks Hemicelluloses During Active Oxygen Cooking as a Pretreatment for Biomass Conversion

Cited by 8 publications

References 20 publications

Active Oxygen and Solid Alkali Pretreatment of Bamboo Residue: Features of Hemicellulose during the Cooking Process

Active Oxygen and Solid Alkali Pretreatment of Bamboo Residue: Features of Hemicellulose during the Cooking Process

Bisulfite pretreatment changes the structure and properties of oil palm empty fruit bunch to improve enzymatic hydrolysis and bioethanol production

A Kinetic Study of DDGS Hemicellulose Acid Hydrolysis and NMR Characterization of DDGS Hydrolysate

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