scholarly journals Enhanced cellulose efficiency of pressurized hot water pretreated highland Ethiopian bamboo (Yushania alpina): A potential feedstock for ethanol production

2021 ◽  
Author(s):  
CI Chemistry International
Keyword(s):  
Chemical Composition ◽  
Lignin Content ◽  
Hot Water ◽  
Cellulose Content ◽  
Distilled Water ◽  
Pretreatment Method ◽  
Water Pretreatment ◽  
Pretreatment Time ◽  
Hot Water Pretreatment ◽  
Lignocellulose Biomass

For the production of ethanol from pretreated lignocellulose biomass play a paramount role in facilitating the conversion of cellulose into glucose in the hydrolysis step. Therefore, this study is focused on the effect of hot water pretreatment on the chemical composition (cellulose and lignin) of highland bamboo of Ethiopia. The chemical composition of highland bamboo showed 46.76% (w/w) cellulose, 25.27% (w/w) lignin, 12.18% (w/w) hemicellulose, 3.77% (w/w) ash, 12.23% (w/w) hot-water extractive and 3.93% (w/w) ethanol-toluene extractives. The effect of hot water pretreatment was observed after the biomass was treated in the autoclave at 121, 128 and 135 oC with 5, 10, and 15 min pretreatment time with distilled water. The best pretreatment method was selected based on the pretreatment method which maximized the cellulose content and minimized the lignin content. Based on the selected pretreatment method a higher cellulose content of 52.44% and lower lignin content of 27.85% was achieved at 128 oC temperature and 10 min pretreatment time.

scholarly journals Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Amandine Leroy ◽  
Xavier Falourd ◽  
Loïc Foucat ◽  
Valérie Méchin ◽  
Fabienne Guillon ◽  
...  
Keyword(s):  
Cell Wall ◽  
Negative Impact ◽  
Lignin Content ◽  
Structural Features ◽  
Hot Water ◽  
Condensed State ◽  
Structural Factors ◽  
Water Pretreatment ◽  
Hot Water Pretreatment ◽  
The Impact

Abstract Background Biomass recalcitrance is governed by various molecular and structural factors but the interplay between these multiscale factors remains unclear. In this study, hot water pretreatment (HWP) was applied to maize stem internodes to highlight the impact of the ultrastructure of the polymers and their interactions on the accessibility and recalcitrance of the lignocellulosic biomass. The impact of HWP was analysed at different scales, from the polymer ultrastructure or water mobility to the cell wall organisation by combining complementary compositional, spectral and NMR analyses. Results HWP increased the kinetics and yield of saccharification. Chemical characterisation showed that HWP altered cell wall composition with a loss of hemicelluloses (up to 45% in the 40-min HWP) and of ferulic acid cross-linking associated with lignin enrichment. The lignin structure was also altered (up to 35% reduction in β–O–4 bonds), associated with slight depolymerisation/repolymerisation depending on the length of treatment. The increase in $${T}_{1\rho }^{H}$$ T 1 ρ H , $${T}_{HH}$$ T HH and specific surface area (SSA) showed that the cellulose environment was looser after pretreatment. These changes were linked to the increased accessibility of more constrained water to the cellulose in the 5–15 nm pore size range. Conclusion The loss of hemicelluloses and changes in polymer structural features caused by HWP led to reorganisation of the lignocellulose matrix. These modifications increased the SSA and redistributed the water thereby increasing the accessibility of cellulases and enhancing hydrolysis. Interestingly, lignin content did not have a negative impact on enzymatic hydrolysis but a higher lignin condensed state appeared to promote saccharification. The environment and organisation of lignin is thus more important than its concentration in explaining cellulose accessibility. Elucidating the interactions between polymers is the key to understanding LB recalcitrance and to identifying the best severity conditions to optimise HWP in sustainable biorefineries.

scholarly journals Effects of water pretreatment on properties of pellets made from beech particles

2021 ◽  
Vol 75 (1) ◽  
pp. 39-51
Author(s):  
Jasmina Popovic ◽  
Mladjan Popovic ◽  
Milanka Djiporovic-Momcilovic ◽  
Ana Prahin ◽  
Vladimir Dodevski ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Beech Wood ◽  
Ash Content ◽  
Hot Water ◽  
Specific Density ◽  
Heating Value ◽  
Water Pretreatment ◽  
Pretreatment Effects ◽  
Hot Water Pretreatment

Particles of beech wood were treated with hot water at the temperature of 150 oC, during 60 min, prior to the pelleting process. The applied hot water pretreatment affected the chemical composition and heating value of particles. Two groups of pellets, designated as PT 10 and PT 20, were produced from treated beech particles, with the moisture content of particles being 10.5 and 20.5 %, respectively. Pellets from nontreated beech particles (PNT) served as controls to assess the hot water pretreatment effects on the pellet properties. Both, the applied pretreatment, and the particle moisture content, affected properties of the obtained pellets. The heating value of PT 10 ad PT 20 pellets has increased for ~6 and 1 %, respectively. The mineral (ash) content in treated pellets decreased for about 24 % in comparison to that in PNT pellets. In addition, the bulk (apparent) density of pellets has increased for 21 % (PT 10) and 10 % (PT 20), as a consequence of the hot water pretreatment of particles. The specific density of PT 10 pellets was for 16 % higher, while the equilibrium moisture content (after conditioning at RH 68 % and 20.1?C) was for about 32 % lower in comparison to the respective properties of PNT pellets.

Lignocellulosic Content and Biofuel Potential of Post-harvest Sugarcane Leaves from Commonly Cultivated Indian Varieties

2020 ◽  
Vol 8 (2) ◽  
pp. 15-23
Author(s):  
Suchithra Palliprath ◽  
◽  
Najya Jabeen Poolakkalody ◽  
Kaviraj Ramesh ◽  
Chithra Manisseri ◽  
...  
Keyword(s):  
Dry Weight ◽  
Hot Water ◽  
Biofuel Production ◽  
Cellulose Content ◽  
Post Harvest ◽  
Water Pretreatment ◽  
Saccharification Efficiency ◽  
Hot Water Pretreatment ◽  
Pretreated Biomass ◽  
Selection Of

Sugarcane is one of the most important crops in India and its post-harvest leaves having low fodder value compared to many other agri residues, can be utilized for biofuel production. There is no detailed information on the lignocellulosic content of cane straw from different varieties, which could be helpful for the selection of potential biofuel feedstock and designing suitable pretreatment methods. Hence, in the present study, lignocellulosic content of post-harvest leaves from seventeen Indian cane varieties was analyzed for its better utilization in bioethanol production. Major cell wall polymers such as cellulose, hemicellulose and lignin were estimated in a range of 53.8-38.7%, 34.4-23.6% and 18.9-13.3% dry weight of biomass respectively in these varieties. Cellulose, hemicellulose and lignin contents in Nayana (CO 86032) were found to be 53.8%, 31% and 18.4% respectively. Among the tested varieties, Nayana was selected for further pretreatment studies being one of the candidates widely cultivated in India with high sucrose and cellulose content. 1-ethyl,3-methylimidazolium acetate ([Emim][Ac]) pretreatment at 150°C for 3 hr was found to be effective in biomass depolymerization. Higher degree of delignification was observed in [Emim][Ac] (62.1%) compared to hot water pretreatment (13.4%). FTIR spectra also confirmed the effective depolymerization of the biomass. The biofuel potential of [Emim][Ac] pretreated biomass was assessed in terms of saccharification efficiency and was found 3.8 fold higher compared to untreated biomass at 72 hr of enzymatic hydrolysis.

Impact of Liquid Hot Water Pretreatment on the Structural Changes of Sugarcane Bagasse Biomass for Sugar Production

2014 ◽  
Vol 472 ◽  
pp. 774-779 ◽  
Author(s):  
Hong Dan Zhang ◽  
Shu Bin Wu
Keyword(s):  
Sugarcane Bagasse ◽  
Structural Changes ◽  
Lignin Content ◽  
Hot Water ◽  
Raw Material ◽  
Liquid Hot Water Pretreatment ◽  
Liquid Hot Water ◽  
Water Pretreatment ◽  
Pretreatment Temperature ◽  
Hot Water Pretreatment

Liquid hot water pretreatment, as an initial step in an alternative use of lignocellulosic biomass to produce fermentable sugar, was performed in this study. The effect of pretreatment temperature range from 160 to 200 °C on the hemicellulose degradation (the yields of glucose and xylose, as well as inhibitors) and cellulose enzymatic digestibility were evaluated. The results indicated that the maximum xylose yields (combined 2.23 g xylose and 13.20 g xylo-oligosaccharides per 100g raw material) in prehydrolysate liquid were obtained at 180 °C. The untreated and pretreated solid residues were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and fourier transform infrared spectroscopy (FT-IR). The results showed that liquid hot water pretreatment removed a large number of hemicellulose and resulted in enriched cellulose and lignin content in the pretreated residues. Due to the effective removal of hemicellulose, the maximum glucose yield in enzyme hydrolyzate reached 37.27 g per 100 g raw material (after the pretreatment temperature of 200°C), representing 90.13% of glucose in the sugarcane bagasse.

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

scholarly journals Improvement of sugar yields from corn stover using sequential hot water pretreatment and disk milling

2016 ◽  
Vol 216 ◽  
pp. 706-713 ◽  
Author(s):  
Sun Min Kim ◽  
Bruce S. Dien ◽  
M.E. Tumbleson ◽  
Kent D. Rausch ◽  
Vijay Singh
Keyword(s):  
Corn Stover ◽  
Hot Water ◽  
Water Pretreatment ◽  
Hot Water Pretreatment

scholarly journals Does Acid Addition Improve Liquid Hot Water Pretreatment of Lignocellulosic Biomass towards Biohydrogen and Biogas Production?

2020 ◽  
Vol 12 (21) ◽  
pp. 8935 ◽  
Author(s):  
George Dimitrellos ◽  
Gerasimos Lyberatos ◽  
Georgia Antonopoulou
Keyword(s):  
Lignocellulosic Biomass ◽  
Biogas Production ◽  
Hot Water ◽  
Liquid Hot Water ◽  
Acid Addition ◽  
Water Pretreatment ◽  
Inhibitory Compounds ◽  
Production Of Hydrogen ◽  
Potential Inhibitors ◽  
Hot Water Pretreatment

The effect of liquid hot water (LHW) pretreatment with or without acid addition (A-LHW) on the production of hydrogen—through dark fermentation (DF)—and methane—through anaerobic digestion (AD)—using three different lignocellulosic biomass types (sunflower straw (SS), grass lawn (GL), and poplar sawdust (PS)) was investigated. Both pretreatment methods led to hemicellulose degradation, but A-LHW resulted in the release of more potential inhibitors (furans and acids) than the LHW pretreatment. Biological hydrogen production (BHP) of the cellulose-rich solid fractions obtained after LHW and A-LHW pretreatment was enhanced compared to the untreated substrates. Due to the release of inhibitory compounds, LHW pretreatment led to higher biochemical methane potential (BMP) than A-LHW pretreatment when both separated fractions (liquid and solid) obtained after pretreatments were used for AD. The recovered energy in the form of methane with LHW pretreatment was 8.4, 12.5, and 7.5 MJ/kg total solids (TS) for SS, GL, and PS, respectively.

Sign in / Sign up

Export Citation Format

Share Document