Combination of ultrasonication and deep eutectic solvent in pretreatment of lignocellulosic biomass for enhanced enzymatic saccharification

Lee, Kiat Moon; Hong, Ju Yin; Tey, Wah Yen

doi:10.1007/s10570-020-03598-5

Cited by 48 publications

(12 citation statements)

References 59 publications

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“…Ultrasound-assisted DES treatment could be an effective treatment approach for straw biomass. For example, 36.7% reducing sugar was obtained from oil palm empty fruit bunch (OPEFB) under ChCl:LA coupled with 60% sonication power (210 W) at 50°C for 30 min ( Lee, et al, 2021 ). Furthermore, corn straw was pretreated in combination with ultrasonic [20 k (60 W) and 40 k (60 W) for 30 min], microwave (120°C, 1 min), and DES (ChCl:OA:Gly) treatment, achieving 61.5% lignin, 90.3% hemicellulose, and 76.1% cellulose ( Yan et al, 2021 ).…”

Section: Combined Pretreatmentmentioning

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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Section: Combined Pretreatmentmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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“…Compared with the traditional hydroxide delignification method, the ChCl–OA DES delignification method in this work can partially remove hemicellulose and lignin, and the hemicellulose and lignin dissolution rates of DW were 11.76 and 28.21% (Figure a). The ChCl–OA DES delignification has a high selectivity for lignin and hemicellulose, which is the strong hydrogen bonding formed by carboxyl oxygen in oxalic acid, resulting in ChCl–OA DES easily breaking the hydrogen bond between hemicellulose and cellulose and also between lignin and carbohydrates . Besides, ChCl–OA DES is an acidic DES that dissolves the separated lignin–carbohydrate complex well.…”

Section: Resultsmentioning

confidence: 99%

“…The ChCl−OA DES delignification has a high selectivity for lignin and hemicellulose, which is the strong hydrogen bonding formed by carboxyl oxygen in oxalic acid, 26 resulting in ChCl−OA DES easily breaking the hydrogen bond between hemicellulose and cellulose and also between lignin and carbohydrates. 27 Besides, ChCl−OA DES is an acidic DES that dissolves the separated lignin−carbohydrate complex well. Removal of hemicellulose and lignin can make the wood cell gap and prepare the way for subsequent modification.…”

Section: Synthesis Of Wood Acoustic Diaphragmmentioning

confidence: 99%

Ultra-Thin Wood-Based Acoustic Diaphragms Fabricated via an Environmentally Friendly Strategy

Yang

Dong

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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An acoustic diaphragm is a crucial component that regulates sound quality in earphones and loudspeakers. Natural wood with inherent good acoustic resonance and vibration spectrum is widely used in sound devices. However, using natural wood to produce an acoustic diaphragm is still a big challenge because making ultra-thin wood is hard and it warps easily. Therefore, this study introduces a new method for preparing ultra-thin wood acoustic diaphragms less than 10 μm in thickness, relying on delignification, sulfonation, and densifying techniques. The innovative sulfonation process increased the intermolecular hydrogen bond force, which significantly improved the tensile strength and Young’s modulus of the wood diaphragm, up to 195 MPa and 27.1 GPa, respectively. Compared with the commonly used diaphragms in the market, this wood diaphragm exhibits an excellent specific dynamic elastic modulus up to 95.1 GPa/g cm3, indicating better acoustic properties. Also, the resonance frequency was up to 1240 Hz, 4.5 times higher than the titanium diaphragm among high-end products. Besides, the drying shrinkage rate of the ultra-thin wood diaphragm is only 1.2%, indicating excellent dimensional stability. This high-quality wood acoustic diaphragm has a very high application prospect and outstanding attributes for promoting the development of acoustic devices. Moreover, the reaction reagent can be recycled after preparation, and the selected reagents are green and environmentally friendly.

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“…The synergistic effect of ultrasonication with DES-based pretreatment was investigated on the oil palm empty fruit bunch [103]. Three different types of DESs, namely ChCl:lactic acid, ChCl:urea and ChCl:glycerol, were studied.…”

Section: Des Pretreatment Coupled With Ultrasonic Irradiation and Mwmentioning

confidence: 99%

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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Combination of ultrasonication and deep eutectic solvent in pretreatment of lignocellulosic biomass for enhanced enzymatic saccharification

Cited by 48 publications

References 59 publications

Advances in Pretreatment of Straw Biomass for Sugar Production

Advances in Pretreatment of Straw Biomass for Sugar Production

Ultra-Thin Wood-Based Acoustic Diaphragms Fabricated via an Environmentally Friendly Strategy

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

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