Deep eutectic solvent as an efficient molecular liquid for lignin solubilization and wood delignification

Malaeke, Hassan; Housaindokht, Mohammad Reza; Monhemi, Hassan; Izadyar, Mohammad

doi:10.1016/j.molliq.2018.05.001

Cited by 142 publications

(67 citation statements)

References 42 publications

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“…Other DES have also been evaluated for wood delignification, based on ChCl as HBA and phenol, α-naphthol, resorcinol or maleic acid as HBD, with the aid of ultrasound irradiation. The results showed that all the DES have good solubility properties toward lignin, leading to more than 48% w/w recovery in the case of resorcinol (176).…”

Section: Lignocellulosic Byproductsmentioning

confidence: 99%

Bioactive Phenolic Compounds From Agri-Food Wastes: An Update on Green and Sustainable Extraction Methodologies

et al. 2020

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Phenolic compounds are broadly represented in plant kingdom, and their occurrence in easily accessible low-cost sources like wastes from agri-food processing have led in the last decade to an increase of interest in their recovery and further exploitation. Indeed, most of these compounds are endowed with beneficial properties to human health (e.g., in the prevention of cancer and cardiovascular diseases), that may be largely ascribed to their potent antioxidant and scavenging activity against reactive oxygen species generated in settings of oxidative stress and responsible for the onset of several inflammatory and degenerative diseases. Apart from their use as food supplements or as additives in functional foods, natural phenolic compounds have become increasingly attractive also from a technological point of view, due to their possible exploitation in materials science. Several extraction methodologies have been reported for the recovery of phenolic compounds from agri-food wastes mostly based on the use of organic solvents such as methanol, ethanol, or acetone. However, there is an increasing need for green and sustainable approaches leading to phenolic-rich extracts with low environmental impact. This review addresses the most promising and innovative methodologies for the recovery of functional phenolic compounds from waste materials that have appeared in the recent literature. In particular, extraction procedures based on the use of green technologies (supercritical fluid, microwaves, ultrasounds) as well as of green solvents such as deep eutectic solvents (DES) are surveyed.

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Section: Lignocellulosic Byproductsmentioning

confidence: 99%

Bioactive Phenolic Compounds From Agri-Food Wastes: An Update on Green and Sustainable Extraction Methodologies

et al. 2020

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“…A comparative graph between each ES and the temperature and time to achieve complete alkaline lignin dissolution are presented in the SM ( Figure S8). In general, the dissolution of lignin in a solvent involves disrupting π-π stacking interactions between lignin aromatic groups and establishing strong intermolecular hydrogen bonds with hydrogen bond acceptor and donor groups (e.g., hydroxyl groups) in lignin structure [62,63]. In this context and by taking a close look at the obtained data, it can be observed that the chemical structure of HBDs plays an important role in alkaline lignin dissolution.…”

Section: Alkaline Lignin Dissolutionmentioning

confidence: 96%

Fast and Efficient Method to Evaluate the Potential of Eutectic Solvents to Dissolve Lignocellulosic Components

et al. 2020

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The application of eutectic solvents (ESs) in lignocellulosic biomass fractionation has been demonstrated as a promising approach to accomplish efficient and environmentally friendly biomass valorization. In general, ESs are a combination of two components, a hydrogen-bonding donor and a hydrogen-bonding acceptor, in which the melting point of the mixture is lower than that of the individual components. However, there are plenty of possible combinations to form ESs with the potential to apply in biomass processing. Therefore, the development of fast and effective screening methods to find combinations capable to dissolve the main biomass components-namely cellulose, hemicelluloses, and lignin-is highly required. An accurate and simple technique based on optical microscopy with or without polarized lenses was used in this study to quickly screen and monitor the dissolution of cellulose, xylose (a monomer of hemicelluloses), and lignin in several ESs. The dissolution of these solutes were investigated in different choline-chloride-based ESs (ChCl:UREA, ChCl:PROP, ChCl:EtGLY, ChCl:OXA, ChCl:GLY, ChCl:LAC). Small amounts of solute and solvent with temperature control were applied and the dissolution process was monitored in real time. The results obtained in this study showed that cellulose was insoluble in these ESs, while lignin and xylose were progressively dissolved.

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“…One example of DES is under the trade name Reline, which is a mixture of choline chloride and urea. When these two a are mixed at the molar ratio of 1:2, a eutectic occurs at a freezing point of 12 °C which is significantly lower than that of its original precursors (Malaeke et al, 2018).…”

Section: Deep Eutectic Solvents (Dess)mentioning

confidence: 97%

Towards the Valorization of Biomass to 5-Hydroxymethylfurfural: A Promising Biochemical and Biofuel Feedstock

Ganado

Francisco

2019

KIMIKA

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The increasing oil demand and exhaustion of reserves have initiated stimulus to search for new and sustainable sources of fuels and fine chemicals. Lignocellulosic biomass turned out to be a promising and renewable feedstock for these applications. 5-hydroxymethylfurfural (HMF) is one of the most promising building blocks for bio-based chemicals that can be derived from lignocellulosic biomass which can be potentially applied for large scale production. However, one of the main factors holding its transition is the need for sustainable, green and financially feasible processes. This review provides the studies made towards catalytic systems used for HMF production, as well as the various solvents and heating system applied. Research efforts to unravel the interactions among catalysts, solvents, and heating systems are encouraged, thereby engineering a synergistic conversion system for biomass valorization.

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Deep eutectic solvent as an efficient molecular liquid for lignin solubilization and wood delignification

Cited by 142 publications

References 42 publications

Bioactive Phenolic Compounds From Agri-Food Wastes: An Update on Green and Sustainable Extraction Methodologies

Bioactive Phenolic Compounds From Agri-Food Wastes: An Update on Green and Sustainable Extraction Methodologies

Fast and Efficient Method to Evaluate the Potential of Eutectic Solvents to Dissolve Lignocellulosic Components

Towards the Valorization of Biomass to 5-Hydroxymethylfurfural: A Promising Biochemical and Biofuel Feedstock

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