Effect of sodium sulfite on acid pretreatment of wheat straw with respect to its final conversion to ethanol

Jaisamut, K.; Paulová, Leona; Patáková, Petra; Kotúčová, Soňa; Rychtera, M.

doi:10.1016/j.biombioe.2016.08.022

Cited by 25 publications

(17 citation statements)

References 25 publications

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“…Wheat is one of the major crops grow around the world. Approximately 690 ktons of wheat were produced globally in 2009, later reaching 730 million tons in 2014 1 , 2 . As the waste residue of wheat, large mass of wheat straw (WS) has been generated every year and become the most abundant agricultural biomass worldwide after rice straw 3 .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Jaisamut et al . (2016) pretreated WS with the combination of 180 °C, 30 min, 1% H 2 SO 4 , and 2.4% Na 2 SO 3 , which resulted in 80% of the cellulose conversion into glucose 2 . Yin and Wang (2017) demonstrated that after irradiation at 100 kGy and 2% NaOH treatment of WS for 1 h, mononeric sugar yield could reach 72.67% 33 .…”

Section: Introductionmentioning

confidence: 99%

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Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Zheng

Zhou

Wang

et al. 2018

Sci Rep

149

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Wheat straw (WS) is a potential biomass for production of monomeric sugars. However, the enzymatic hydrolysis ratio of cellulose in WS is relatively low due to the presence of lignin and hemicellulose. To enhance the enzymatic conversion of WS, we tested the impact of three different pretreatments, e.g. sulfuric acid (H2SO4), sodium hydroxide (NaOH), and hot water pretreatments to the enzymatic digestions. Among the three pretreatments, the highest cellulose conversion rate was obtained with the 4% NaOH pretreatment at 121 °C (87.2%). In addition, NaOH pretreatment was mainly effective in removing lignin, whereas the H2SO4 pretreatment efficiently removed hemicellulose. To investigate results of pretreated process for enhancement of enzyme-hydolysis to the WS, we used scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy to analyze structural changes of raw and treated materials. The structural analysis indicated that after H2SO4 and NaOH pretreatments, most of the amorphous cellulose and partial crystalline cellulose were hydrolyzed during enzymatic hydrolysis. The findings of the present study indicate that WS could be ideal materials for production of monomeric sugars with proper pretreatments and effective enzymatic base hydrolysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Zheng

Zhou

Wang

et al. 2018

Sci Rep

149

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“…Acidic pre-treatment works by hydrolyzing the hemicellulose into its individual monosaccharide composition. The lignin is condensed and precipitated at the same time (Jaisamut et al 2016). Cellulose is released from lignin and enzymes used in enzyme hydrolysis now have more accessibility to the cellulose (Jaisamut et al 2016).…”

Section: Acidic Pre-treatmentmentioning

confidence: 99%

“…Secondly, toxic by-products that inhibit enzyme hydrolysis are produced during the decomposition of the cell wall (Jaisamut et al 2016). Common by-products include phenolics (hydroxybenzoic acid), furfural, hydroxymethylfurfural (HMF) and other organic acids (Zhu et al 2015;Zhou et al 2018).…”

Section: Acidic Pre-treatmentmentioning

confidence: 99%

Production of Bioplastics from Renewable and Sustainable Feedstock Resources

Chaudhry¹

2023

Preprint

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This study illustrates the potential opportunity for the utilization of hemp to produce PHB (poly(3-hydroxybutyrate). The objective of the study was to optimize simple sugar availability from hemp for Ralstonia eutropha. The use of three pre-treatment methods (grinded – 5% NaOH – Autoclave at 121 oC for 60 minutes) was able to provide a better fractional insoluble solids (FIS) of ≃ 61 % that was significantly better compared to other combinations of pre-treatments studied. Optimum enzyme dosage was also determined by comparing different enzyme concentrations and found that three enzymes should contain a dose of 1.5 g /L. The optimum pretreatment and hydrolysis conditions resulted in a better enzyme hydrolysis yield of 10.9 % and PHB yield of ≃ 43 %. Results also demonstrate that sonification did not improve PHB recovery, while pH control increased PHB recovery. Keywords: Hemp, Ralstonia eutropha, PHB, Pre-treatment, Enzyme Hydrolysis

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“…14,15 One of the most developed pretreatment processes based on the use of sulfite ions, named SPORL (sulfite pretreatment to overcome recalcitrance of lignocellulose), was set under acidic conditions to remove hemicelluloses, providing some lignin removal and sulfonation of residual lignin. 15 The performance of the SPORL process was investigated to pretreat wood chips, 15,[17][18][19] corn cob, 20 corn stalk, 21 Agave, 22 switchgrass, 14 wheat straw, 23 and bamboo. 24,25 To be efficient with softwood biomass, the pretreatment requires low pH, high cooking temperature (175-1958C), and high sulfite loads (up to 8% w/w).…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of acid and alkaline sulfite pretreatments for enzymatic saccharification of bagasses from three different sugarcane hybrids

Monte

Laurito-Friend

Mussatto

et al. 2018

Biotechnology Progress

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Sugarcane bagasses from three experimental sugarcane hybrids and a mill-reference sample were used to compare the efficiency and mode of action of acid and alkaline sulfite pretreatment processes. Varied chemical loads and reaction temperatures were used to prepare samples with distinguished characteristics regarding xylan and lignin removals, as well as sulfonation levels of residual lignins. The pretreatment with low sulfite loads (5%) under acidic conditions (pH 2) provided maximum glucose yield of 70% during enzymatic hydrolysis with cellulases (10 FPU/g) and β-glucosidases (20 UI/g bagasse). In this case, glucan enzymatic conversion from pretreated materials was mostly associated with extensive xylan removal (70-100%) and partial delignification occurred during the pretreatment. The use of low sulfite loads under acidic conditions required pretreatment temperatures of 160°C. In contrast, at a lower pretreatment temperature (120°C), alkaline sulfite process achieved similar glucan digestibility, but required a higher sulfite load (7.5%). Residual xylans from acid pretreated materials were almost completely hydrolysed by commercial enzymes, contrasting with relatively lower xylan to xylose conversions observed in alkaline pretreated samples. Efficient xylan removal during acid sulfite pretreatment and during enzymatic digestion can be useful to enhance glucan accessibility and digestibility by cellulases. Alkaline sulfite process also provided substrates with high glucan digestibility, mainly associated with delignification and sulfonation of residual lignins. The results demonstrate that temperature, pH, and sulfite can be combined for reducing lignocellulose recalcitrance and achieve similar glucan conversion rates in the alkaline and acid sulfite pretreated bagasses. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:944-951, 2018.

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Effect of sodium sulfite on acid pretreatment of wheat straw with respect to its final conversion to ethanol

Cited by 25 publications

References 25 publications

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Production of Bioplastics from Renewable and Sustainable Feedstock Resources

Comparative evaluation of acid and alkaline sulfite pretreatments for enzymatic saccharification of bagasses from three different sugarcane hybrids

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