A clean and effective potassium hydroxide pretreatment of corncob residue for the enhancement of enzymatic hydrolysis at high solids loading

Chi, Xuewen; Liu, Chao; Bi, Yanhong; Yu, Guang; Zhang, Yuedong; Wang, Zhaoyu; Li, Bin; Cui, Qiu

doi:10.1039/c9ra01555h

Cited by 55 publications

(17 citation statements)

References 45 publications

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“…requires around 20 filter paper units per gram of dry solids to achieve near-complete hydrolysis 8 – 11 . Some of the earlier reports indicate that cellulase requirement can be lowered below 20 FPUg −1 upon pretreatment with catalysts such as hydrogen peroxide-assisted sodium carbonate, mild acid-catalyzed atmospheric glycerol (organosolv) or potassium hydroxide 12 – 14 . In particular, pretreatment of biomass with dilute acids, ionic liquids, via steam explosion or the hydrothermal process reportedly increased the porosity of lignocellulosic substrates, due to removal of hemicelluloses and lignin resulting in rapid hydrolysis due to enhanced access of cellulases to cellulose 15 – 19 .…”

Section: Introductionmentioning

confidence: 99%

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

Chiranjeevi

Balasubramaniam

Velankar

2021

Sci Rep

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Cellulolytic enzymes can readily access the cellulosic component of lignocellulosic biomass after the removal of lignin during biomass pretreatment. The enzymatic hydrolysis of cellulose is necessary for generating monomeric sugars, which are then fermented into ethanol. In our study, a combination of a deep eutectic (DE) mixture (of 2-aminoethanol and tetra-n-butyl ammonium bromide) and a cyclic ether (tetrahydrofuran) was used for selective delignification of rice straw (RS) under mild conditions (100 °C). Pretreatment with DE-THF solvent system caused ~ 46% delignification whereas cellulose (~ 91%) and hemicellulose (~ 67%) recoveries remained higher. The new solvent system could be reused upto 10 subsequent cycles with the same effectivity. Interestingly, the DE-THF pretreated cellulose showed remarkable enzymatic hydrolysability, despite an increase in its crystallinity to 72.3%. Contrary to conventional pretreatments, we report for the first time that the enzymatic hydrolysis of pretreated cellulose is enhanced by the removal of lignin during DE-THF pretreatment, notwithstanding an increase in its crystallinity. The current study paves way for the development of newer strategies for biomass depolymerization with DES based solvents.

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Section: Introductionmentioning

confidence: 99%

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

Chiranjeevi

Balasubramaniam

Velankar

2021

Sci Rep

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“…The purpose of the KOH pretreatment is to improve the enzymatic hydrolysis efficiency [ 40 ]. Therefore, numerical optimization was performed by selecting the enzyme digestibility as the most important response (GC: importance level 3 and ED: importance level 5).…”

Section: Resultsmentioning

confidence: 99%

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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“…The technology uses a small number of FeSO 4 (0.3–3%, m/m of raw materials) to guide the reaction to degradation development. It uses TiO 2 (3–12.5%, m/m of raw materials) as oxidizing agents and KOH (2.5–20%, m/m of raw materials) as hydrolyzing agent for lignin oxidation 17 and hydrolysis of protein and cellulose 18 , 19 . Meanwhile, to provide a favorable metabolic environment for the reaction, the conditions of temperature and pressure are set at 80–175 ℃ and 3–12.5 atmospheres, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effects of organic fertilizers via quick artificial decomposition on crop growth

et al. 2021

Sci Rep

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Applying organic matters into the soil would help to improve soil quality and sustain crop production. In addition, the small molecular organic matters could be active in influencing soil nutrient cycling and crop development. Thus, this study has firstly induced a new technology of quick artificial decomposition to produce fertilizers containing small molecular organic compounds from crop residues and other biological wastes. The fertilizers were produced via the quick artificial decomposition from biological wastes. The small organic species in the fertilizers were identified by the LC–MS. Field experiments of kiwifruit were conducted to test the effects of fertilizers. In total, 341 species of small organic matters have been determined in the produced fertilizers. The results showed that the organic fertilizers could significantly increase the yields of kiwifruit by 15.2% in contrast with mineral fertilizer treatments. Whereas, the organic fertilizers could enhance the contents of nutritive components in kiwifruits. These results proved that the organic fertilizers containing more small organic matter could be more efficient in promoting crop production.

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A clean and effective potassium hydroxide pretreatment of corncob residue for the enhancement of enzymatic hydrolysis at high solids loading

Abstract: The effective KOH pretreatment with the production of lignin-based fertilizer could well match the enzymatic hydrolysis at high solid loading.

Cited by 55 publications

References 45 publications

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

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

Effects of organic fertilizers via quick artificial decomposition on crop growth

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