Structural changes in lignin during organosolv pretreatment of Liriodendron tulipifera and the effect on enzymatic hydrolysis

Koo, Bonwook; Min, Byeong-Cheol; Gwak, Ki-Seob; Lee, Soomin; Choi, Ji‐Won; Yeo, Hwanmyeong; Choi, In-Gyu

doi:10.1016/j.biombioe.2012.03.012

Cited by 102 publications

(62 citation statements)

References 36 publications

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“…Pretreatment conditions lead to simultaneous hydrolysis and lignin removal [74] via the disruption of internal bonds in lignin, lignin-hemicellulose bonds, and glycosidic bonds in hemicelluloses and to a smaller extent in cellulose [142]. Other changes include the formation of droplets of lignin on the surface of pretreated biomass, a situation that inhibits hydrolysis by adsorption on the surface of the cellulose [143]. Process variables such as temperature, reaction time, solvent concentration, and acid dose affect the physical characteristics (crystallinity, degree of polymerization of cellulose, and fibre length) of the pretreated substrates.…”

Section: Process Descriptionmentioning

confidence: 99%

“…High sugar yields and product recovery have been observed on ethanosolv pretreatment of various materials including hybrid poplar [155] and Japanese cypress [156]. A major advantage is the potential to recover much of the ethanol [143,157] and water [141] which reduces the operating cost. Ethanosolv coproducts such as hemicellulose syrup and lignin can serve as feedstocks for the production of high value biochemicals.…”

Section: Process Variationsmentioning

confidence: 99%

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Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Bensah

Mensah

2013

International Journal of Chemical Engineering

277

105

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Pretreatment of lignocellulose has received considerable research globally due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. Some of the most promising pretreatment methods require the application of chemicals such as acids, alkali, salts, oxidants, and solvents. Thus, advances in research have enabled the development and integration of chemical-based pretreatment into proprietary ethanol production technologies in several pilot and demonstration plants globally, with potential to scale-up to commercial levels. This paper reviews known and emerging chemical pretreatment methods, highlighting recent findings and process innovations developed to offset inherent challenges via a range of interventions, notably, the combination of chemical pretreatment with other methods to improve carbohydrate preservation, reduce formation of degradation products, achieve high sugar yields at mild reaction conditions, reduce solvent loads and enzyme dose, reduce waste generation, and improve recovery of biomass components in pure forms. The use of chemicals such as ionic liquids, NMMO, and sulphite are promising once challenges in solvent recovery are overcome. For developing countries, alkalibased methods are relatively easy to deploy in decentralized, low-tech systems owing to advantages such as the requirement of simple reactors and the ease of operation.

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Section: Process Descriptionmentioning

confidence: 99%

Section: Process Variationsmentioning

confidence: 99%

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Bensah

Mensah

2013

International Journal of Chemical Engineering

277

105

View full text Add to dashboard Cite

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“…The sugar concentrations of the fermentation liquids at 120 h are very low (data are not shown). Moreover, the ethanol yield increased to almost 60% in the initial 20 h. Others have reported that enzymatic hydrolysis was improved as a result of increased surface area (Koo et al 2012). However, in the case of GL-Ethanol pretreatment, small adherent reactive lignin may generate some inhibitors, and could influence the activity of the yeast.…”

Section: Effect Of Pretreatment Methods On Ethanol Productionmentioning

confidence: 97%

Comparison of Pretreatment Methods for Production of Ethanol from Sugarcane Bagasse

et al. 2016

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Sugarcane bagasse (SCB) was modified by steam explosion pretreatment at 190 °C for 10 min and 210 °C for 5 min using green liquor (GL) combined with hydrogen peroxide (GL-H2O2) and ethanol (GL-Ethanol) for simultaneous saccharification and fermentation (SSF)-based ethanol production. The results showed that 85.02% and 100% of hemicelluloses were solubilized by steam explosion pretreatment at 190 °C for 10 min and 210 °C for 5 min, respectively. Moreover, 20.08% and 73.77% of the lignin was removed through GL-H2O2 and GL-Ethanol pretreatments, respectively. The steam explosion pretreatments greatly improved the specific surface area of the SCB and led to the highest ethanol yield of 92.20% at 190 °C for 10 min and 93.19% of 210 °C for 5 min, respectively. In addition, the ethanol yield reached 72.58% for the GL-Ethanol pretreatment, and about 70% of active lignin could be recovered from the pretreatment liquid. When the GL-H2O2 pretreatment was used, the maximum ethanol yield of 20.92% was achieved.

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“…4b) or 2.08, which indicated that lignin was still not removed completely. It has been reported that lignin droplets can inhibit enzymatic hydrolysis by preventing the adsorption of enzymes (Koo et al 2012).…”

Section: Fig 3 Effects Of Pretreatment Ph On Ft-ir Spectra Of Pretrmentioning

confidence: 99%

Comparative Evaluation of Magnesium Bisulfite Pretreatment under Different pH Values for Enzymatic Hydrolysis of Corn Stover

Ren

Liu

et al. 2016

BioResources

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During pretreatment, the pretreatment pH often plays an important role in removing hemicelluloses and lignin for improving the conversion of biomass to sugars. In this study, corn stover was subjected to magnesium bisulfite pretreatment (MBSP) under various pH conditions. The obtained data showed that the hemicelluloses and lignin were solubilized by MBSP, which led to changes in the structural and chemical properties of the pretreated material. The pretreatment pH could alter the existing forms of SO2, and magnesium bisulfite was the most effective reagent for removing lignin. A relatively neutral MBSP (pH 5.13) not only considerably improved the enzymatic hydrolysis yield (80.18%), but also produced a large amount of high-value xylo-oligosaccharides in the spent liquor. Furthermore, only the hemicellulose removal showed a linear relationship with the enzymatic hydrolysis yield. These results suggest that removal of all the lignin might not be necessary to improve the hydrolysis efficiency.

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Structural changes in lignin during organosolv pretreatment of Liriodendron tulipifera and the effect on enzymatic hydrolysis

Cited by 102 publications

References 36 publications

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Comparison of Pretreatment Methods for Production of Ethanol from Sugarcane Bagasse

Comparative Evaluation of Magnesium Bisulfite Pretreatment under Different pH Values for Enzymatic Hydrolysis of Corn Stover

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