Aqueous solutions of deep eutectic systems as reaction media for the saccharification and fermentation of hardwood xylan into xylitol

Romaní, Aloia; Morais, Eduarda S.; Soares, Pedro; Freire, Mara G.; Freire, Carmen S. R.; Silvestre, Armando J. D.; Domingues, Lucı́lia

doi:10.1016/j.biortech.2020.123524

Cited by 34 publications

(7 citation statements)

References 36 publications

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“…DES had good application prospects in biomass pretreatment and had the advantages of high efficiency and low energy consumption. DES was composed of a hydrogen bond donor (HBD) and hydrogen bond acceptor (HBA) in a certain molar ratio and formed a mixture with a lower melting point through a hydrogen bond network . DES was first used in biomass delignification in 2012 and showed good pretreatment effects .…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Deep Eutectic Solvent Delignification: Insights from Molecular Dynamics Simulations

Kong

Peng

et al. 2021

ACS Sustainable Chem. Eng.

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Based on the field of ReaxFF, the pretreatment of a lignin−carbohydrate complex model in a choline chloride-based deep eutectic solvent was proposed. The results showed that the β-O-4 ether and glycosidic bonds in the model were broken at an optimal temperature of 373 K. The best pretreatment solvent was choline chloride/lactic acid (1:2), and 40% of the model compounds were decomposed. Free protons in deep eutectic solvents were one of the critical factors in the process of biomass delignification, and thus acidic hydrogen binding donors generally had a high lignin removal rate, but there was no significant correlation with the acidity of the hydrogen bonding donors. In the deep eutectic solvents of choline chloride/lactic acid, the delignification effect tended to decrease with the increase of lactic acid content. The delignification effect of monocarboxylic acid hydrogen bond donors decreased with the increasing molecular chain length, while the opposite effect of delignification was observed for dicarboxylic acids. The molecular dynamics simulations showed that choline chloride/glycerol (1:2) with a slightly weaker hydrogen bonding network could bind better and solubilize the product molecules, with interaction energies of −170.89 and −61.99 kJ/mol with carbohydrates and phenolic compounds, respectively.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Deep Eutectic Solvent Delignification: Insights from Molecular Dynamics Simulations

Kong

Peng

et al. 2021

ACS Sustainable Chem. Eng.

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“…108 Consequently, it could be necessary to dilute the DES wasted liquor before fermentation. The literature by Romani ́et al 109 has investigated how to use a Saccharomyces cerevisiae PE2 strain to simultaneously saccharify and ferment xylan in the presence of DES solution (choline chloride:urea) to produce xylitol. To eliminate the inhibitory effects of urea, the xylan standard was solubilized (20% DES).…”

Section: Hdes Limitations and Possible Solutionsmentioning

confidence: 99%

A Critical Review of Emerging Hydrophobic Deep Eutectic Solvents’ Applications in Food Chemistry: Trends and Opportunities

Boateng

2022

J. Agric. Food Chem.

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Due to their low cost, biodegradability, and ease of preparation, deep eutectic solvents (DESs) are considered promising green alternatives to conventional solvents, as exploiting green solvents has been a research focus for achieving sustainable development goals. Most DESs in published studies are hydrophilic. On the other hand, the DES’s hydrophilicity restricts its practical applicability to just polar molecules, which is a vital disadvantage to this extractant. Hydrophobic DES (HDES) has been developed as a new extractant adept at extracting nonpolar inorganic and organic compounds from aqueous systems. Although there has been little research on HDESs (HDES publications account for <10% of DES), specific intriguing applications have been discovered, requiring investigation and comparisons. As a result, this review covers the applications of emerging HDES in detecting pesticide residues, food additives, contaminants in food packaging, heavy metals, separation and extraction processes in food. According to the available literature, HDESs have the potential to overcome the limitations of hydrophilic DESs and be used in a broader range of applications in food with greater efficiency, which has received little attention. HDES is expected to substitute a lot of harmful organic extractants used for analytical reasons (food chemistry) in the future. Besides, the limitations of HDES were reviewed, and future studies were provided. This will serve as a reference for green chemistry advocates and practitioners in food science who want to minimize pollution and improve efficiency and benefit from the further development of HDESs.

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“…Xylose which looks like crystalline powder in nature, being used as natural sweetener in food production and as additives in detergents. Xylitol is derived from xylose chemically by hydrogenation or biologically (bacteria, yeast and fungi) through fermentation processes (Romaní et al, 2020). Xylitol has wide applications in dental caries treatment, consumed by diabetic patients as an alternative for sugar, used in various products like nasal spray, mouth wash, cosmetics and pharmaceuticals (Baptista et al, 2020).…”

Section: Cellulose and Hemicellulose Derived Compoundsmentioning

confidence: 99%

Agriculture Waste Management - A Case study on Bowenpally Mandi

S¹,

Padma²

2022

MAJ

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In the hunt for alternative energy sources, lignocellulosic biomass (LCB), such as forestry and agricultural residues, appears to be a potential raw material for transformation into useful bio-products in so-called biorefineries, as it is abundant at low/no cost. The electricity generation capacity is expected to expand from 183 GW to 800 GW by 2031-32. In contrast to demand, India's indigenous energy sources are insufficient, leaving it reliant on crude oil imports (>80%). Alternative 2G renewable energy solutions have become important due to oil geopolitics and environmental concerns. As an agrarian tropical nation, crops produce significant volumes of residues, resulting in both resource waste and a missed opportunity to increase farmer revenue. As a result, forestry and agriculture leftovers on and off the farm can be used to generate bio-energy and other platform chemicals. The recalcitrance and intricacy of cellulose fibrils intertwined with hemicellulose and lignin render lignocellulosic biomass (LCB) generally inaccessible to cellulolytic enzymes in the native state, despite being renewable and inexpensive. Bio delignification/ depolymerization with ligninases can break down such complicated materials. Further hydrolysis of LCB to convert cellulosic and hemicellulosic fractions into monomeric sugars is dependent on the costs and robust enzymes such as glycosyl hydrolases (GHs), which have multiple substrates, are more stable at high temperatures and a wide pH range, and have improved catalytic efficiency. Thermozymes, enzymes obtained from thermophilic microbes possess unique characteristics such as temperature, chemical, and pH stability. They can certainly be used in several industrial processes by replacing mesophilic enzymes. Because the process works at slightly elevated temperatures, thermostable ligninases and GHs are of special importance. The biocatalyst's stability and reusability have always been important obstacles in creating biocatalytic reactions. The challenges and potential of employing thermophiles and their derived enzymes (thermozymes) in various stages of biomass conversion into a variety of commercial chemicals are discussed in this review.

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Aqueous solutions of deep eutectic systems as reaction media for the saccharification and fermentation of hardwood xylan into xylitol

Cited by 34 publications

References 36 publications

Mechanism of Deep Eutectic Solvent Delignification: Insights from Molecular Dynamics Simulations

Mechanism of Deep Eutectic Solvent Delignification: Insights from Molecular Dynamics Simulations

A Critical Review of Emerging Hydrophobic Deep Eutectic Solvents’ Applications in Food Chemistry: Trends and Opportunities

Agriculture Waste Management - A Case study on Bowenpally Mandi

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