Liquid hot water and alkaline pretreatment of soybean straw for improving cellulose digestibility

2011 ◽  
Vol 102 (10) ◽  
pp. 6254-6259 ◽  
Author(s):  
Caixia Wan ◽  
Yuguang Zhou ◽  
Yebo Li
Keyword(s):  
Alkaline Pretreatment ◽  
Hot Water ◽  
Liquid Hot Water ◽  
Cellulose Digestibility ◽  
Soybean Straw

scholarly journals Effect of Lignin Content on Cellulolytic Saccharification of Liquid Hot Water Pretreated Sugarcane Bagasse

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 623 ◽  
Author(s):  
Rafaela I. S. Ladeira Ázar ◽  
Sidnei Emilio Bordignon-Junior ◽  
Craig Laufer ◽  
Jordan Specht ◽  
Drew Ferrier ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Plant Cell Wall ◽  
Lignin Content ◽  
Blocking Agent ◽  
Enzymatic Digestion ◽  
Hot Water ◽  
Severity Factor ◽  
Liquid Hot Water ◽  
Cellulose Digestibility ◽  
Pretreated Sugarcane Bagasse

Lignin contributes to the rigid structure of the plant cell wall and is partially responsible for the recalcitrance of lignocellulosic materials to enzymatic digestion. Overcoming this recalcitrance is one the most critical issues in a sugar-flat form process. This study addresses the effect of low lignin sugarcane bagasse on enzymatic hydrolysis after liquid hot water pretreatment at 190 °C and 20 min (severity factor: 3.95). The hydrolysis of bagasse from a sugarcane line selected for a relatively low lignin content, gave an 89.7% yield of cellulose conversion to glucose at 40 FPU/g glucan versus a 68.3% yield from a comparably treated bagasse from the high lignin bred line. A lower enzyme loading of 5 FPU/g glucan (equivalent to 3.2 FPU/g total solids) resulted in 31.4% and 21.9% conversion yields, respectively, for low and high lignin samples, suggesting the significance of lignin content in the saccharification process. Further increases in the enzymatic conversion of cellulose to glucose were achieved when the bagasse sample was pre-incubated with a lignin blocking agent, e.g., bovine serum albumin (50 mg BSA/g glucan) at 50 °C for 1 h prior to an actual saccharification. In this work, we have demonstrated that even relatively small differences in lignin content can result in considerably increased sugar production, which supports the dissimilarity of bagasse lignin content and its effects on cellulose digestibility. The increased glucose yields with the addition of BSA helped to decrease the inhibition of non-productive absorption of cellulose enzymes onto lignin and solid residual lignin fractions.

scholarly journals Diverse Banana Pseudostems and Rachis Are Distinctive for Edible Carbohydrates and Lignocellulose Saccharification towards High Bioethanol Production under Chemical and Liquid Hot Water Pretreatments

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3870
Author(s):  
Jingyang Li ◽  
Fei Liu ◽  
Hua Yu ◽  
Yuqi Li ◽  
Shiguang Zhou ◽  
...  
Keyword(s):  
Soluble Sugars ◽  
Enzymatic Saccharification ◽  
Hot Water ◽  
Biofuel Production ◽  
Bioenergy Crops ◽  
Bioethanol Production ◽  
Factors Affecting ◽  
Liquid Hot Water ◽  
Biomass Processing ◽  
Banana Crops

Banana is a major fruit crop throughout the world with abundant lignocellulose in the pseudostem and rachis residues for biofuel production. In this study, we collected a total of 11 pseudostems and rachis samples that were originally derived from different genetic types and ecological locations of banana crops and then examined largely varied edible carbohydrates (soluble sugars, starch) and lignocellulose compositions. By performing chemical (H2SO4, NaOH) and liquid hot water (LHW) pretreatments, we also found a remarkable variation in biomass enzymatic saccharification and bioethanol production among all banana samples examined. Consequently, this study identified a desirable banana (Refen1, subgroup Pisang Awak) crop containing large amounts of edible carbohydrates and completely digestible lignocellulose, which could be combined to achieve the highest bioethanol yields of 31–38% (% dry matter), compared with previously reported ones in other bioenergy crops. Chemical analysis further indicated that the cellulose CrI and lignin G-monomer should be two major recalcitrant factors affecting biomass enzymatic saccharification in banana pseudostems and rachis. Therefore, this study not only examined rich edible carbohydrates for food in the banana pseudostems but also detected digestible lignocellulose for bioethanol production in rachis tissue, providing a strategy applicable for genetic breeding and biomass processing in banana crops.

scholarly journals Liquid Hot Water Pretreatment and Enzymatic Hydrolysis as a Valorization Route of Italian Green Pepper Waste to Delivery Free Sugars

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1640
Author(s):  
M.A. Martín-Lara ◽  
L. Chica-Redecillas ◽  
A. Pérez ◽  
G. Blázquez ◽  
G. Garcia-Garcia ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Liquid Fraction ◽  
Hot Water ◽  
Effect Of Temperature ◽  
Green Pepper ◽  
Free Sugars ◽  
Liquid Hot Water Pretreatment ◽  
Liquid Hot Water ◽  
Water Pretreatment ◽  
Hot Water Pretreatment

In this work, liquid hot water pretreatment (autohydrolysis) was used to improve enzymatic hydrolysis of a commonly consumed vegetable waste in Spain, Italian green pepper, to finally produce fermentable sugars. Firstly, the effect of temperature and contact time on sugar recovery during pretreatment (in insoluble solid and liquid fraction) was studied in detail. Then, enzymatic hydrolysis using commercial cellulase was performed with the insoluble solid resulting from pretreatment. The objective was to compare results with and without pretreatment. The results showed that the pretreatment step was effective to facilitate the sugars release in enzymatic hydrolysis, increasing the global sugar yield. This was especially notable when pretreatment was carried out at 180 °C for 40 min for glucose yields. In these conditions a global glucose yield of 61.02% was obtained. In addition, very low concentrations of phenolic compounds (ranging from 69.12 to 82.24 mg/L) were found in the liquid fraction from enzymatic hydrolysis, decreasing the possibility of fermentation inhibition produced by these components. Results showed that Italian green pepper is an interesting feedstock to obtain free sugars and prevent the enormous quantity of this food waste discarded annually.

Optimizing Liquid Hot Water pretreatment conditions to enhance sugar recovery from wheat straw for fuel-ethanol production

Fuel ◽  
2008 ◽  
Vol 87 (17-18) ◽  
pp. 3640-3647 ◽  
Author(s):  
J.A. Pérez ◽  
I. Ballesteros ◽  
M. Ballesteros ◽  
F. Sáez ◽  
M.J. Negro ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Wheat Straw ◽  
Fuel Ethanol ◽  
Hot Water ◽  
Sugar Recovery ◽  
Liquid Hot Water Pretreatment ◽  
Liquid Hot Water ◽  
Water Pretreatment ◽  
Pretreatment Conditions ◽  
Hot Water Pretreatment

Tissue-specific biomass recalcitrance in corn stover pretreated with liquid hot-water: Enzymatic hydrolysis (part 1)

2011 ◽  
Vol 109 (2) ◽  
pp. 390-397 ◽  
Author(s):  
Meijuan Zeng ◽  
Eduardo Ximenes ◽  
Michael R. Ladisch ◽  
Nathan S. Mosier ◽  
Wilfred Vermerris ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Corn Stover ◽  
Hot Water ◽  
Biomass Recalcitrance ◽  
Tissue Specific ◽  
Liquid Hot Water ◽  
Specific Biomass

Conversion of Lignocellulosics Pretreated with Liquid Hot Water to Ethanol

1996 ◽  
pp. 157-170 ◽  
Author(s):  
G. Peter Van Walsum ◽  
Stephen G. Allen ◽  
Mark J. Spencer ◽  
Mark S. Laser ◽  
Michael J. Antal ◽  
...  
Keyword(s):  
Hot Water ◽  
Liquid Hot Water

Changes in poplar (Populus trichocarpa) wood porous structure after liquid hot water (LHW) pretreatment

2020 ◽  
Vol 112 ◽  
pp. 71-78
Author(s):  
Florentyna Akus-Szyblerg ◽  
Jan Szadkowski ◽  
Andrzej Antczak ◽  
Janusz Zawadzki
Keyword(s):  
Enzymatic Hydrolysis ◽  
Porous Structure ◽  
Populus Trichocarpa ◽  
Hot Water ◽  
Size Exclusion ◽  
Bioethanol Production ◽  
Poplar Wood ◽  
Liquid Hot Water ◽  
Exclusion Chromatography ◽  
Pretreatment Conditions

Changes in poplar (Populus trichocarpa) wood porous structure after liquid hot water (LHW) pretreatment. The aim of this research was to investigate the effect of applying different hydrothermal pretreatment conditions on the porous structure of poplar wood. Porosity is recognised as an important factor considering efficiency of an enzymatic hydrolysis as a step of bioethanol production. Native poplar wood as well as solid fractions after pretreatment performed at different temperatures (160 °C, 175 °C and 190 °C) were analysed. Porous structure was examined with an inverse size-exclusion chromatography (ISEC) method. Results indicated a significant development of the porous structure of the biomass with increasing porosity along with the growing temperature of the LHW process. The temperature of 190 °C was chosen as the most promising condition of poplar wood LHW pretreatment in terms of the efficiency of the subsequent steps of bioethanol production. The obtained results were consistent with the previous experimental data procured during analysis of the LHW pretreated poplar wood and its subsequent enzymatic hydrolysis yield.

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