Hot water pretreatment of lignocellulosic biomass: Modeling the effects of temperature, enzyme and biomass loadings on sugar yield

Wells, Jon M.; Drielak, Edward; Surendra, K.C.; Khanal, Samir Kumar

doi:10.1016/j.biortech.2019.122593

Cited by 54 publications

(15 citation statements)

References 37 publications

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“…The values decreased from 53.9% to 46.6% as temperature and time increased, mainly due to the progressive solubilization of some components of the raw material such as hemicellulosic sugars, extractives, and soluble ashes. These are the compounds that are most easily solubilized in this type of hydrothermal pretreatment, since their structure is less complex than that of other components of the vegetable waste [41,49,51,[63][64][65]. The decrease in the solid recovery was well in agreement with the literature [35,[66][67][68][69].…”

Section: Solid Yieldsupporting

confidence: 87%

“…The operating conditions were chosen according to recent published works on the use of liquid hot water techniques as pretreatment of lignocelullosic materials for the production of fermentable sugars [41,49].…”

Section: Liquid Hot Water Pretreatmentmentioning

confidence: 99%

“…Although optimization of liquid hot water pretreatment technology was previously reported in work by Wells et al [41], the success of the "auto-hydrolysis process" depends mainly on crop type, harvest year, location, etc. and it needs to be carefully optimized for maximizing the final result.…”

Section: Introductionmentioning

confidence: 99%

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

Martín-Lara

Chica-Redecillas

Pérez

et al. 2020

Foods

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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.

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Section: Solid Yieldsupporting

confidence: 87%

Section: Liquid Hot Water Pretreatmentmentioning

confidence: 99%

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

Martín-Lara

Chica-Redecillas

Pérez

et al. 2020

Foods

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“…It is estimated that thermal water softens up the rigid structure of CNS. Various studies have reported that hot water pretreatment at high pressure and high temperature can enhance enzymatic hydrolysis of biomass without the addition of other chemicals [14,28]. The released glucose concentrations were found to be 8.7 g/L, 12.0 g/L and 15.3 g/L at KOH concentration of 1%, 2% and 3%, respectively, and were not significantly affected by KOH concentrations above 3%.…”

Section: Effect Of Koh Concentration On Pretreatment Of Chestnut Shellsmentioning

confidence: 91%

Improvement of Enzymatic Glucose Conversion from Chestnut Shells through Optimization of KOH Pretreatment

Lee

et al. 2021

IJERPH

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Worldwide, about one-third of food produced for human consumption is wasted, which includes byproducts from food processing, with a significant portion of the waste still being landfilled. The aim of this study is to convert chestnut shells (CNSs) from food processing into a valuable resource through bioprocesses. Currently, one of the highest barriers to bioprocess commercialization is low conversion of sugar from biomass, and KOH pretreatment was suggested to improve enzymatic digestibility (ED) of CNS. KOH concentration of 3% (w/w) was determined as a suitable pretreatment solution by a fundamental experiment. The reaction factors including temperature, time and solid/liquid (S/L) ratio were optimized (77.1 g/L CNS loading at 75 °C for 2.8 h) by response surface methodology (RSM). In the statistical model, temperature and time showed a relatively significant effect on the glucan content (GC) and ED, but S/L ratio was not. GC and ED of the untreated CNS were 45.1% and 12.7%, respectively. On the other hand, GC and ED of pretreated CNS were 83.2% and 48.4%, respectively, and which were significantly improved by about 1.8-fold and 3.8-fold compared to the control group. The improved ED through the optimization is expected to contribute to increasing the value of byproducts generated in food processing.

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“…Of the different strategies employed to fractionate hemicellulose from lignocellulosic biomass, including alkaline ( Geng et al, 2018 ), dilute acid ( Rusanen et al, 2019 ), and hot water hydrolysis ( Gallina et al, 2018 ), the use of hot water has dual advantages of improving the feedstock quality and performance for downstream conversion ( Wells et al, 2020 ) and also requiring no chemical inputs ( Kim et al, 2009 ). Hot water pretreatment reduces inorganic impurities and improves biomass combustion quality ( Liu et al, 2018 ), as well as reduces biomass recalcitrance and enhances fermentable sugar production ( Wells et al, 2020 ). Moreover, up to 95% of hemicellulose could be fractionated from lignocellulosic biomass using hot water extraction (HWE) at 160–170°C, for 40–120 min ( Krogell et al, 2013 ; Gallina et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of High Value Prebiotics From Biorefinery-Relevant Feedstocks

et al. 2021

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Hemicellulose, a structural polysaccharide and often underutilized co-product stream of biorefineries, could be used to produce prebiotic ingredients with novel functionalities. Since hot water pre-extraction is a cost-effective strategy for integrated biorefineries to partially fractionate hemicellulose and improve feedstock quality and performance for downstream operations, the approach was applied to process switchgrass (SG), hybrid poplar (HP), and southern pine (SP) biomass at 160°C for 60 min. As a result, different hemicellulose-rich fractions were generated and the chemical characterization studies showed that they were composed of 76–91% of glucan, xylan, galactan, arabinan, and mannan oligosaccharides. The hot water extracts also contained minor concentrations of monomeric sugars (≤18%), phenolic components (≤1%), and other degradation products (≤3%), but were tested for probiotic activity without any purification. When subjected to batch fermentations by individual cultures of Lactobacillus casei, Bifidobacterium bifidum, and Bacteroides fragilis, the hemicellulosic hydrolysates elicited varied responses. SG hydrolysates induced the highest cell count in L. casei at 8.6 log10 cells/ml, whereas the highest cell counts for B. fragilis and B. bifidum were obtained with southern pine (5.8 log10 cells/ml) and HP hydrolysates (6.4 log10 cells/ml), respectively. The observed differences were attributed to the preferential consumption of mannooligosaccharides in SP hydrolysates by B. fragilis. Lactobacillus casei preferentially consumed xylooligosaccharides in the switchgrass and southern pine hydrolysates, whereas B. bifidum consumed galactose in the hybrid poplar hydrolysates. Thus, this study (1) reveals the potential to produce prebiotic ingredients from biorefinery-relevant lignocellulosic biomass, and (2) demonstrates how the chemical composition of hemicellulose-derived sources could regulate the viability and selective proliferation of probiotic microorganisms.

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Hot water pretreatment of lignocellulosic biomass: Modeling the effects of temperature, enzyme and biomass loadings on sugar yield

Cited by 54 publications

References 37 publications

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

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

Improvement of Enzymatic Glucose Conversion from Chestnut Shells through Optimization of KOH Pretreatment

Production and Characterization of High Value Prebiotics From Biorefinery-Relevant Feedstocks

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