scholarly journals Effect of hydrothermal pretreatment on the structural changes of alkaline ethanol lignin from wheat straw

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Xue Chen ◽  
Hanyin Li ◽  
Shaoni Sun ◽  
Xuefei Cao ◽  
Runcang Sun
Keyword(s):  
Wheat Straw ◽  
Structural Changes ◽  
Hydrothermal Pretreatment

scholarly journals Hydrothermal Pretreatment of Wheat Straw: Effects of Temperature and Acidity on Byproduct Formation and Inhibition of Enzymatic Hydrolysis and Ethanolic Fermentation

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 487
Author(s):  
Dimitrios Ilanidis ◽  
Stefan Stagge ◽  
Leif J. Jönsson ◽  
Carlos Martín
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Wheat Straw ◽  
High Performance ◽  
Enzymatic Saccharification ◽  
Hydrothermal Pretreatment ◽  
Gas Chromatography Mass Spectrometry ◽  
Enzymatic Digestibility ◽  
Acid Catalyzed ◽  
Pretreatment Conditions

Biochemical conversion of wheat straw was investigated using hydrothermal pretreatment, enzymatic saccharification, and microbial fermentation. Pretreatment conditions that were compared included autocatalyzed hydrothermal pretreatment at 160, 175, 190, and 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment at 160 and 190 °C. The effects of using different pretreatment conditions were investigated with regard to (i) chemical composition and enzymatic digestibility of pretreated solids, (ii) carbohydrate composition of pretreatment liquids, (iii) inhibitory byproducts in pretreatment liquids, (iv) furfural in condensates, and (v) fermentability using yeast. The methods used included two-step analytical acid hydrolysis combined with high-performance anion-exchange chromatography (HPAEC), HPLC, ultra-high performance liquid chromatography-electrospray ionization-triple quadrupole-mass spectrometry (UHPLC-ESI-QqQ-MS), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Lignin recoveries in the range of 108–119% for autocatalyzed hydrothermal pretreatment at 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment were attributed to pseudolignin formation. Xylose concentration in the pretreatment liquid increased with temperature up to 190 °C and then decreased. Enzymatic digestibility was correlated with the removal of hemicelluloses, which was almost quantitative for the autocatalyzed hydrothermal pretreatment at 205 °C. Except for the pretreatment liquid from the autocatalyzed hydrothermal pretreatment at 205 °C, the inhibitory effects on Saccharomyces cerevisiae yeast were low. The highest combined yield of glucose and xylose was achieved for autocatalyzed hydrothermal pretreatment at 190 °C and the subsequent enzymatic saccharification that resulted in approximately 480 kg/ton (dry weight) raw wheat straw.

scholarly journals Ensiling of wheat straw decreases the required temperature in hydrothermal pretreatment

2013 ◽  
Vol 6 (1) ◽  
pp. 116 ◽  
Author(s):  
Morten Ambye-Jensen ◽  
Sune Thomsen ◽  
Zsófia Kádár ◽  
Anne S Meyer
Keyword(s):  
Wheat Straw ◽  
Hydrothermal Pretreatment

scholarly journals Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Qi Zheng ◽  
Tiantian Zhou ◽  
Yibin Wang ◽  
Xiaohua Cao ◽  
Songqing Wu ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Wheat Straw ◽  
Structural Changes

scholarly journals Investigation on the attack of Trichoderma viride on wheat straw composites manufactured with methylene diphenyl diisocyanate

BioResources ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 6004-6014
Author(s):  
Li Yan ◽  
Fei-yang Zeng ◽  
Kun Zang ◽  
Zhang-jing Chen ◽  
Ya-fang Lei
Keyword(s):  
High Performance Liquid Chromatography ◽  
Surface Layer ◽  
Wheat Straw ◽  
High Performance ◽  
Structural Changes ◽  
Trichoderma Viride ◽  
Poplar Wood ◽  
Methylene Diphenyl Diisocyanate ◽  
Ethanol Extracts

Trichoderma viride can infect wheat straw composites (WSC), thus affecting the quality of boards. This study investigated the change in color of the composite and its chemical composition after the straw was infested with mold with for 4, 8, or 12 weeks. Fourier transform infrared spectroscopy (FTIR) and high-performance liquid chromatography (HPLC) were used to analyze chemical structural changes in the WSC after the infestation. The infested surface and core layers were examined and analyzed. The infection of T. viride on the WSC can darken its color. After 12 weeks of cultural infestation, 19.6% of cellulose, 27.2% of xylan, 9.3% of lignin, and 31.9% of ethanol extracts were degraded. The degradation on WSC by T. viride was 9 times and 14 times more than the degradations of pine and poplar wood, respectively. T. viride attacked WSB differently on its surface and center layers. More lignin in the WSB surface layer was degraded. In contrast, cellulose and xylan were degraded to a greater degree in the center.

Pressure drop, mechanic deformation, stabilization and scale-up of wheat straw fixed-beds during hydrothermal pretreatment: Experiments and modeling

2019 ◽  
Vol 360 ◽  
pp. 1587-1600 ◽  
Author(s):  
Wienke Reynolds ◽  
Marc Conrad ◽  
Sarah Mbeukem ◽  
Rainer Stank ◽  
Irina Smirnova
Keyword(s):  
Pressure Drop ◽  
Wheat Straw ◽  
Scale Up ◽  
Hydrothermal Pretreatment ◽  
Fixed Beds

scholarly journals Enzyme affinity to cell types in wheat straw (Triticum aestivum L.) before and after hydrothermal pretreatment

2013 ◽  
Vol 6 (1) ◽  
pp. 54 ◽  
Author(s):  
Mads AT Hansen ◽  
Budi J Hidayat ◽  
Kit K Mogensen ◽  
Martin D Jeppesen ◽  
Bodil Jørgensen ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Wheat Straw ◽  
Cell Types ◽  
Triticum Aestivum L ◽  
Hydrothermal Pretreatment ◽  
Before And After

A 13C CP/MAS NMR evaluation of the structural changes in wheat straw subjected to different chemical and biological pulping conditions

1997 ◽  
Vol 60 (3) ◽  
pp. 245-249 ◽  
Author(s):  
M.E. Guadalix ◽  
G. Almendros ◽  
A.T. Martínez ◽  
F.J. González-Vila ◽  
U. Lankes
Keyword(s):  
Wheat Straw ◽  
Structural Changes ◽  
Mas Nmr ◽  
Cp Mas Nmr ◽  
13C Cp Mas Nmr

scholarly journals Effect of pH on hemicellulose extraction and physicochemical characteristics of solids during hydrothermal pretreatment of eucalyptus

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6627-6635
Author(s):  
Zeguang Yang ◽  
Liming Cao ◽  
Yan Li ◽  
Min Zhang ◽  
Fanyan Zeng ◽  
...  
Keyword(s):  
Dissolution Rate ◽  
Structural Changes ◽  
Crystallinity Index ◽  
Physicochemical Characteristics ◽  
Total Dissolved Solids ◽  
Hydrothermal Pretreatment ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Effects Of Ph

The effects of pH on residual solids (RS), total dissolved solids (TDS), carbohydrates, and lignin in eucalyptus during hydrothermal pretreatment were studied. The balance between RS and TDS was obtained at pH 4.0 in hydrothermal pretreatment with pre-adjustment pH. The yield of hemicellulose increased, and oligosaccharides dominated. Hemicellulose had the highest dissolution rate, and cellulose and lignin had the lowest dissolution rate at pH 4.0. The crystallinity index (CrI) and structural transformation of lignin was analyzed by X-ray diffraction (XRD) and nuclear magnetic resonance spectroscopy (NMR) with or without pretreatment. The CrI at pH 4.0 was 64.2% higher than that with the traditional hydrothermal pretreatment (62.1%). The β-O-4 bonds, OMe, and phenylcoumarane of lignin were protected. The highest hemicellulose extraction and minimal physicochemical structural changes were obtained at pH 4.0.

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