Natural deep eutectic solvent mediated extrusion for continuous high-solid pretreatment of lignocellulosic biomass

Ai, Binling; Li, Wenqi; Woomer, Joseph; Li, Mi; Pu, Yunqiao; Sheng, Zhanwu; Zheng, Lili; Adedeji, Akinbode A.; Ragauskas, Arthur J.; Shi, Jian

doi:10.1039/d0gc01560a

Cited by 66 publications

(22 citation statements)

References 56 publications

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“…Furthermore, the extent of delignification in the obtained CR processed in different DES compositions seems to have no direct correlation with the glucose yields obtained [delignification DPCR10 = 56.0 ± 2.14%; DPCR20 = 67.9 ± 4.62% at 95.9 ± 2.12% and 92.5 ± 1.63% glucose yield, respectively]. Indeed, several papers report high glucose yield (~90%) with 50–60% delignification 17 , 51 , 52 , even 91% glucose yield at ~10% delignification 53 . Therefore, we believe that the formation of condensed lignin particles, in analogy to the previously reported inhibiting effect of redeposited pseudolignin 54 – 56 , is the reason for decreased enzyme activity.…”

Section: Resultsmentioning

confidence: 99%

Tunable and functional deep eutectic solvents for lignocellulose valorization

et al. 2021

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Stabilization of reactive intermediates is an enabling concept in biomass fractionation and depolymerization. Deep eutectic solvents (DES) are intriguing green reaction media for biomass processing; however undesired lignin condensation is a typical drawback for most acid-based DES fractionation processes. Here we describe ternary DES systems composed of choline chloride and oxalic acid, additionally incorporating ethylene glycol (or other diols) that provide the desired ‘stabilization’ function for efficient lignocellulose fractionation, preserving the quality of all lignocellulose constituents. The obtained ethylene-glycol protected lignin displays high β-O-4 content (up to 53 per 100 aromatic units) and can be readily depolymerized to distinct monophenolic products. The cellulose residues, free from condensed lignin particles, deliver up to 95.9 ± 2.12% glucose yield upon enzymatic digestion. The DES can be recovered with high yield and purity and re-used with good efficiency. Notably, we have shown that the reactivity of the β-O-4 linkage in model compounds can be steered towards either cleavage or stabilization, depending on DES composition, demonstrating the advantage of the modular DES composition.

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Section: Resultsmentioning

confidence: 99%

Tunable and functional deep eutectic solvents for lignocellulose valorization

et al. 2021

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“…DESs play three roles in the pretreatment process, which can be used as an excellent catalyst, solvent, and substrate. Only understanding the connection with the special structures and properties of DESs can design the ideal and suitable DESs for the pretreatment of various straw biomass ( Hou et al, 2017 ; Ai et al, 2020 ). Furthermore, using the hydrophobic DESs and water can reduce hygroscopicity and viscosity, respectively ( Chen and Mu, 2019 ; Hooshmand et al, 2020 ).…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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Straw biomass is an inexpensive, sustainable, and abundant renewable feedstock for the production of valuable chemicals and biofuels, which can surmount the main drawbacks such as greenhouse gas emission and environmental pollution, aroused from the consumption of fossil fuels. It is rich in organic content but is not sufficient for extensive applications because of its natural recalcitrance. Therefore, suitable pretreatment is a prerequisite for the efficient production of fermentable sugars by enzymatic hydrolysis. Here, we provide an overview of various pretreatment methods to effectively separate the major components such as hemicellulose, cellulose, and lignin and enhance the accessibility and susceptibility of every single component. This review outlines the diverse approaches (e.g., chemical, physical, biological, and combined treatments) for the excellent conversion of straw biomass to fermentable sugars, summarizes the benefits and drawbacks of each pretreatment method, and proposes some investigation prospects for the future pretreatments.

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“…Additionally, the characterization of lignin streams demonstrated that lignin maintained the structural characteristics during the extrusion. The results show that the DES-mediated extrusion process is a promising technology that enables the continuous pretreatment of lignocellulosic biomass at a high solid loading [158].…”

Section: Conclusion: Perspectives and Criticisms On The Use Of Desmentioning

confidence: 95%

Deep Eutectic Solvents for the Valorisation of Lignocellulosic Biomasses towards Fine Chemicals

Scelsi

Angelini

Pastore

2021

Biomass

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The growing demand for energy and materials in modern society pushes scientific research to finding new alternative sources to traditional fossil feedstocks. The exploitation of biomass promises to be among the viable alternatives with a lower environmental impact. Making biomass exploitation technologies applicable at an industrial level represents one of the main goals for our society. In this work, the most recent scientific studies concerning the enhancement of lignocellulosic biomasses through the use of deep eutectic solvent (DES) systems have been examined and reported. DESs have an excellent potential for the fractionation of lignocellulosic biomass: the high H-bond capacity and polarity allow the lignin to be deconvolved, making it easier to break down the lignocellulosic complex, producing a free crystallite of cellulose capable of being exploited and valorised. DESs offer valid alternatives of using the potential of lignin (producing aromatics), hemicellulose (achieving furfural) and cellulose (delivering freely degradable substrates through enzymatic transformation into glucose). In this review, the mechanism of DES in the fractionation of lignocellulosic biomass and the main possible uses for the valorisation of lignin, hemicellulose and cellulose were reported, with a critical discussion of the perspectives and limits for industrial application.

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Natural deep eutectic solvent mediated extrusion for continuous high-solid pretreatment of lignocellulosic biomass

Abstract:
Several deep eutectic solvents (DESs) have been demonstrated to be highly effective for lignocellulosic biomass pretreatment, combining the advantages of simple synthesis, relatively low chemical cost and better biocompatibility as...

Cited by 66 publications

References 56 publications

Tunable and functional deep eutectic solvents for lignocellulose valorization

Tunable and functional deep eutectic solvents for lignocellulose valorization

Advances in Pretreatment of Straw Biomass for Sugar Production

Deep Eutectic Solvents for the Valorisation of Lignocellulosic Biomasses towards Fine Chemicals

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Natural deep eutectic solvent mediated extrusion for continuous high-solid pretreatment of lignocellulosic biomass

Abstract: Several deep eutectic solvents (DESs) have been demonstrated to be highly effective for lignocellulosic biomass pretreatment, combining the advantages of simple synthesis, relatively low chemical cost and better biocompatibility as...

Cited by 66 publications

References 56 publications

Tunable and functional deep eutectic solvents for lignocellulose valorization

Tunable and functional deep eutectic solvents for lignocellulose valorization

Advances in Pretreatment of Straw Biomass for Sugar Production

Deep Eutectic Solvents for the Valorisation of Lignocellulosic Biomasses towards Fine Chemicals

Contact Info

Product

Resources

About

Abstract:
Several deep eutectic solvents (DESs) have been demonstrated to be highly effective for lignocellulosic biomass pretreatment, combining the advantages of simple synthesis, relatively low chemical cost and better biocompatibility as...