A Comparison of NaOH, Fenton, and Their Combined Pretreatments for Improving Saccharification of Corn Stalks

Yu, Miao; Chang, Sandra; Li, Dongsheng; Zhang, Chengming; Jiang, Li; Han, Yaxin; Qi, Lisong; Li, Jihong; Li, Shizhong

doi:10.1021/acs.energyfuels.7b02217

Cited by 17 publications

(11 citation statements)

References 30 publications

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“…Enzymatic hydrolysis of cellulose into fermentable sugar and subsequent production of fuel ethanol or sugar-based chemicals are important routes of biomass utilization . However, due to the complex structure of biomass, especially lignin and hemicellulose interlacing to wrap cellulose, it is more difficult for cellulose to be degraded by enzymes.…”

Section: Resultsmentioning

confidence: 99%

Fenton Reaction-Modified Corn Stover To Produce Value-Added Chemicals by Ultralow Enzyme Hydrolysis and Maleic Acid and Aluminum Chloride Catalytic Conversion

et al. 2019

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Fenton reaction has been widely used for pretreatment of lignocellulose with the advantages of simple operation, a rapid reaction rate, and less pollution. In this study, batch and fed-batch Fenton reactions to treat corn stover (CS) for carbohydrate utilization were tested. The composition analyses showed that the batch reaction had a greater degree of removal of holocellulose but fed-batch reactions could preserve more hemicellulose. Ultralow enzyme hydrolysis (1 FPU/g) was used to hydrolyze the Fenton reaction-modified CS, and the yield of glucose resulting from batch reaction was 2.5 times higher than that from the raw CS. Surprisingly, a combined catalyst of maleic acid and aluminum chloride (MAAL) was used to catalyze the modified CS for 5-hydroxymethylfurfural (HMF) and furfural production, and the highest conversion values for cellulose and hemicellulose achieved were 82 and 95%, respectively. Confirmed by a series of characterizations, this study provides clear insight into the Fenton reaction and how it can alter the lignin structure to facilitate holocellulose utilization.

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Section: Resultsmentioning

confidence: 99%

Fenton Reaction-Modified Corn Stover To Produce Value-Added Chemicals by Ultralow Enzyme Hydrolysis and Maleic Acid and Aluminum Chloride Catalytic Conversion

et al. 2019

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“…However, the glucose yields obtained from two-step pretreated substrates with NaOH or 60% ethanol were higher than that one-step pretreated solids with the same chemicals, due to the large removal of hemicellulose and lignin, which destroyed the intact structure and provided more reactive sites for cellulase (as shown in Fig. 2 ) [ 34 ]. When a combinatorial pretreatment of them was used, the glucose yield obtained from the two-step pretreated substrate was lower than that from the one-step pretreated solid, which may be caused by lignin precipitation and modification on the fiber surface, resulting in the hindrance of enzyme attack [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

Enhancing enzymatic saccharification of sugarcane bagasse by combinatorial pretreatment and Tween 80

Zhang

Wei

Zhang

et al. 2018

Biotechnol Biofuels

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BackgroundThe recalcitrant structure of lignocellulosic biomass made it challenging for their bioconversion into biofuels and biochemicals. Pretreatment was required to deconstruct the intact structure by the removal of hemicellulose/lignin, improving the cellulose accessibility of enzyme. Combinatorial pretreatments with liquid hot water/H2SO4 and ethanol/NaOH of sugarcane bagasse were developed to improve enzymatic hydrolysis under mild conditions.ResultsAfter one-step 60% ethanol containing 0.5% NaOH pretreatment with solid to liquid ratio of 1/10, the glucose yield after hydrolysis for 72 h with enzyme dosage of 20 FPU/g substrate was enhanced by 41% and 205% compared to that of NaOH or 60% ethanol pretreated solids, respectively. This improvement was correlated with the removal of hemicellulose and lignin. However, using combinatorial pretreatments with 1% H2SO4 followed by 60% ethanol containing 0.5% NaOH, the highest glucose yield with Tween 80 reached 76%, representing 84.5% of theoretical glucose in pretreated substrate. While retaining similar glucose yield, the addition of Tween 80 capacitated either a reduction of enzyme loading by 50% or shortening hydrolysis time to 24 h. However, the enhancement with the addition of Tween 80 decreased as hydrolysis time was extended.ConclusionsThis study demonstrated that a combinatorial pretreatment with 1% H2SO4 followed by 60% ethanol containing 0.5% NaOH had significant effects on improving the enzymatic hydrolysis of sugarcane bagasse. The addition of Tween 80 enabled reducing the enzyme loading or shortening the hydrolysis time. This study provided an economically feasible and mild process for the generation of glucose, which will be subsequently converted to bioethanol and biochemicals.Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1313-7) contains supplementary material, which is available to authorized users.

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“…The most abundant fraction of lignocellulosic biomass, i.e., sugar polymers, are the source of the sole carbon source in the fermentation processes. Therefore, biomass depolymerization and saccharification are crucial for the achievement of the high efficiency of hydrogen [ 8 , 9 ]. However, other polymers occurring in lignocellulosic biomass, i.e., hemicellulose and lignin, are processed simultaneously during the pretreatment of biomass.…”

Section: Introductionmentioning

confidence: 99%

Efficient Extraction of Fermentation Inhibitors by Means of Green Hydrophobic Deep Eutectic Solvents

et al. 2021

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The methods for hydrogen yield efficiency improvements, the gaseous stream purification in gaseous biofuels generation, and the biomass pretreatment are considered as the main trends in research devoted to gaseous biofuel production. The environmental aspect related to the liquid stream purification arises. Moreover, the management of post-fermentation broth with the application of various biorefining techniques gains importance. Chemical compounds occurring in the exhausted liquid phase after biomass pretreatment and subsequent dark and photo fermentation processes are considered as value-added by products. The most valuable are furfural (FF), 5-hydroxymethylfurfural (HMF), and levulinic acid (LA). Enriching their solutions can be carried with the application of liquid–liquid extraction with the use of a suitable solvent. In these studies, hydrophobic deep eutectic solvents (DESs) were tested as extractants. The screening of 56 DESs was carried out using the Conductor-like Screening Model for Real Solvents (COSMO-RS). DESs which exposed the highest inhibitory effect on fermentation and negligible water solubility were prepared. The LA, FF, and HMF were analyzed using FT-IR and NMR spectroscopy. In addition, the basic physicochemical properties of DES were carefully studied. In the second part of the paper, deep eutectic solvents were used for the extraction of FF, LA, and HMF from post-fermentation broth (PFB). The main extraction parameters, i.e., temperature, pH, and DES: PFB volume ratio (VDES:VPFB), were optimized by means of a Box–Behnken design model. Two approaches have been proposed for extraction process. In the first approach, DES was used as a solvent. In the second, one of the DES components was added to the sample, and DES was generated in situ. To enhance the post-fermentation broth management, optimization of the parameters promoting HMF, FF, and LA extraction was carried under real conditions. Moreover, the antimicrobial effect of the extraction of FF, HMF, and LA was investigated to define the possibility of simultaneous separation of microbial parts and denatured peptides via precipitation.

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A Comparison of NaOH, Fenton, and Their Combined Pretreatments for Improving Saccharification of Corn Stalks

Cited by 17 publications

References 30 publications

Fenton Reaction-Modified Corn Stover To Produce Value-Added Chemicals by Ultralow Enzyme Hydrolysis and Maleic Acid and Aluminum Chloride Catalytic Conversion

Fenton Reaction-Modified Corn Stover To Produce Value-Added Chemicals by Ultralow Enzyme Hydrolysis and Maleic Acid and Aluminum Chloride Catalytic Conversion

Enhancing enzymatic saccharification of sugarcane bagasse by combinatorial pretreatment and Tween 80

Efficient Extraction of Fermentation Inhibitors by Means of Green Hydrophobic Deep Eutectic Solvents

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