Combination of hydrothermal pretreatment and sodium hydroxide post-treatment applied on wheat straw for enhancing its enzymatic hydrolysis

Min, Douyong; Wei, Lei; Li, Mingfu; Jia, Zhuan; Wan, Guangcong; Zhang, Qingtong; Qin, Chengrong; Wang, Shuangfei

doi:10.1007/s10570-017-1644-8

Cited by 19 publications

(11 citation statements)

References 36 publications

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“…However, although significant increment was seen on the total sugar of the biomass after hydrothermal pretreatment, the 40‐ and 60‐minute boiled coconut residue was observed to have moderate decrement. This can be attributed to the extensive exposure to heat, which was described by Zou et al 34 Similar results were reported on reduction on total sugar from hydrothermally treated biomasses on 40 and 60 minutes 35,36 . On the other hand, the reducing sugar yield of hydrothermally pretreated biomass was observed to be lower compared to the untreated biomass.…”

Section: Resultssupporting

confidence: 81%

“…This can be attributed to the extensive exposure to heat, which was described by Zou et al 34 Similar results were reported on reduction on total sugar from hydrothermally treated biomasses on 40 and 60 minutes. 35,36 On the other hand, the reducing sugar yield of hydrothermally pretreated biomass was observed to be lower compared to the untreated biomass. During the hydrothermal pretreatment process, the cellulose content increases while the hemicellulose reduces.…”

Section: Hydrothermal Pretreatmentmentioning

confidence: 99%

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Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

et al. 2020

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The objective of this study is to explore the feasibility of sequential hydrothermal and alkaline pretreatment in improving enzymatic hydrolysis and sugar production of coconut pulp residue for bioethanol production. Hydrothermal pretreatment with the different heating duration of 20, 40, 60 minutes yielded 32.27, 27.51, and 26.72 g/L of total sugar, respectively. After posttreatment with 1%, 2%, and 3% alkaline treatment, the further increment of almost 90% on sugar production was observed. Compared to the single pretreatment, the combination of hydrothermal and alkaline pretreatment significantly affected the enzymatic hydrolysis. The optimum condition for efficient hydrolysis was 40 minutes hydrothermal pretreatment, followed by 1% NaOH posttreatment. At these conditions, the total and reducing sugar was 257.14 ± 0.92 and 102.86 ± 0.82 g/L and the maximum ethanol achieved was 27.19 g/L on the 48 hours of fermentation with efficiency and ethanol productivity of 51.83% and 0.57 g/L/h, respectively.

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Section: Resultssupporting

confidence: 81%

Section: Hydrothermal Pretreatmentmentioning

confidence: 99%

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

et al. 2020

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“…When the substrate pretreated with liquid hot water was used for the second-step pretreatment, the xylan removal was lower than that of native material as substrate; however, a significant enhancement in delignification was observed. This phenomenon showed that the removed lignin resurfaced on the fibers caused by liquid hot water pretreatment facilitated the delignification and impeded the hemicellulose removal [ 18 ]. The pretreatment with liquid hot water at 170–180 °C (close to the glass transition temperature) also resulted in the migration of lignin from the middle lamella and cell wall to the fiber surface [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, the delignification after liquid hot water at higher temperatures was difficult due to lignin modified by condensation reactions, which was not consistent with our result, because there was no lignin modification in our research at 120 °C. For dilute acid (H 2 SO 4 ) pretreatment with combined severity factor of 0.95, the xylan and AIL removal reached 75.5% and 1.3%, respectively, indicating that dilute acid pretreatment solubilized much more xylan (hemicellulose) but slight lignin, due to the higher acidity of H 2 SO 4 [ 18 ]. Furthermore, after second pretreatment with 60% ethanol, or 0.5% NaOH, or the combination of them, the contents of xylan and AIL were significantly reduced, especially after the ethanol pretreatment enhanced by NaOH (Case 11).…”

Section: Resultsmentioning

confidence: 99%

“…The results are depicted in Additional file 1 : Table S1. As shown, the amount of xylose was higher than that of glucose, attributed to the major content of xylan in hemicellulose, and/or the strong cellulose, which was much more stable than xylan due to the crystalline structure and high degree of polymerization [ 18 ]. The highest xylose yield was obtained after 1% H 2 SO 4 pretreatment, reached 3.14 g/100 g raw material (including 1.49 g monomer xylose and 1.65 g oligomer xylose), representing 18.2% of removed xylan.…”

Section: Resultsmentioning

confidence: 99%

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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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Comparing impacts of physicochemical properties and hydrolytic inhibitors on enzymatic hydrolysis of sugarcane bagasse

Guo

Luo

et al. 2019

Bioprocess Biosyst Eng

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Combination of hydrothermal pretreatment and sodium hydroxide post-treatment applied on wheat straw for enhancing its enzymatic hydrolysis

Cited by 19 publications

References 36 publications

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

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

Comparing impacts of physicochemical properties and hydrolytic inhibitors on enzymatic hydrolysis of sugarcane bagasse

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