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Rationalizing Polysaccharide Extraction with Deep Eutectic Solvents: From Supramolecular Architecture to Emerging AI-Guided Solvent Design

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Submitted:

04 July 2025

Posted:

08 July 2025

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Abstract
Deep eutectic solvents (DESs) have emerged as sustainable and tunable alternatives to conventional solvents for the extraction polysaccharides. This review presents a struc-ture-informed framework linking DES composition to polysaccharide solubility, em-phasizing the differential responsiveness of amorphous, interfacial, and crystalline domains. Amorphous polysaccharides are efficiently extracted under mild DES condi-tions, while crystalline polymers often require stronger hydrogen bond acceptors or thermal/mechanical activation. Beyond dissolution, DESs modulate key properties of the extracted polysaccharides, including molecular weight, monomer composition, and bioactivity. Comparative analysis highlights how acidic, basic, or metal-coordinating DESs selectively target distinct polymer classes. Emerging innovations, such as in situ DES formation, mechanochemical systems, and switchable solvents, enhance efficiency and reduce downstream processing demands. Furthermore, the integration of machine learning and COSMO-RS modeling enables predictive solvent design, reducing reliance on empirical screening. By combining mechanistic insight, compositional tailoring, and computational tools, this review provides a scientifically grounded perspective for ad-vancing DES-mediated extraction processes and enabling structure-preserving, appli-cation-oriented recovery of polysaccharides in food, pharmaceutical, and biorefinery domains.
Keywords: 
deep eutectic solvents (DESs)
;  
polysaccharide extraction
;  
hydrogen bonding interactions
;  
in situ DES formation
;  
mechanochemical processing
;  
machine learning (ML)
Subject: 
Chemistry and Materials Science  -   Other

1. Introduction

Polysaccharides – such as cellulose, hemicelluloses, pectins, and other biopolymers from plant, algal, and microbial sources, are of increasing interest due to their applications in food, pharmaceutical, and materials science [1]. However, recovering these polysaccharides from biomass presents longstanding challenges. Traditional extraction methods often rely on hot water or harsh chemical treatments, which are energy-intensive and can lead to partial hydrolysis or degradation of the target polysaccharides [2]. For example, prolonged heating in water or dilute acid may break glycosidic bonds or cause depolymerization, diminishing molecular weight and bioactivity of the extracted polysaccharides [1,2]. Conventional processes (e.g. hot water, dilute alkali) also struggle with recalcitrant plant cell wall structures – crystalline cellulose microfibrils enmeshed with lignin and other matrix components – yielding low extraction efficiencies without extensive pretreatment. As a result, multi-step workflows (including mechanical disruption, enzyme or microwave assistance, and solvent purification) are often required to isolate relatively pure polysaccharide fractions [3]. These approaches not only generate chemical waste and consume significant time, but they also risk altering the native structure of polysaccharides (e.g. by de-esterification of pectins or deacetylation of hemicelluloses). In the context of green chemistry and biorefinery development, there is a critical need to reevaluate conventional extraction paradigms by identifying solvent systems capable of efficiently liberating polysaccharides from structurally recalcitrant biomass, while preserving their native conformation and functional properties.
Deep eutectic solvents (DESs) have rapidly emerged as promising alternatives to classical solvents for polysaccharide extraction and dissolution [1]. DESs are formed by combining a hydrogen bond acceptor (e.g. a quaternary ammonium or phosphonium salt) with one or more hydrogen bond donors (e.g. polyols, organic acids, amides) [4], resulting in a eutectic mixture with a melting point far below that of the individual components [5,6]. This concept offers several key advantages aligned with the needs of biopolymer solubilization. Among those, DESs are often composed of inexpensive, biodegradable, and low-toxicity ingredients – for instance, choline chloride (a vitamin B₄ derivative) mixed with natural acids or sugars – making them safer and cost-effective compared to ionic liquids [7]. Also, their physicochemical properties are highly tunable: by varying the component identities and ratios, one can obtain solvents with a tailored polarity, hydrogen-bonding capacity, and pH, optimized for a given polysaccharide [1]. This versatility is particularly important because polysaccharides differ in solubility and bonding (e.g., cellulose is a neutral, crystalline polymer requiring strong hydrogen bond disruption, whereas pectins are acidic, amorphous polysaccharides requiring mild conditions to avoid depolymerization). Furthermore, DESs have negligible vapor pressure and are non-flammable, enabling extractions at elevated temperatures or with microwave/ultrasound without solvent loss or safety hazards [7]. Crucially, DES-based extraction has demonstrated improved efficiency and selectivity: in many cases, DESs yield higher polysaccharide recovery than water or alcohol-based solvents, and the extracts can exhibit equal or greater bioactivity, as shown in Table 1.
The comparative findings presented in Table 1 highlight the considerable advantages of DESs in the extraction of bioactive polysaccharides from various biological sources. Compared to conventional extraction methods such as hot water, ethanol, or acid-base systems, DES-based approaches consistently demonstrate superior extraction efficiency, selectivity, and preservation of functional integrity. Choline chloride-based DESs, in particular, have shown high compatibility with both plant and fungal matrices. For instance, polysaccharides yield from Poria cocos [13], Polygonatum kingianum [26], and Dendrobium devonianum [25] increased by 2.5- to 8.6-fold relative to traditional techniques, with notable enhancements in antioxidant or immunomodulatory activity. In marine-derived matrices such as Saccharina japonica and Fucus vesiculosus, DES-assisted extraction achieved higher yields of alginate and sulfated polysaccharides, while also improving the functional attributes of the extracts.
A key determinant of extraction performance is the specific DES composition. Acidic systems incorporating oxalic acid have been particularly effective for extracting acidic heteropolysaccharides, such as those rich in uronic acids from Morchella importuna [32] and Eucommia ulmoides [24], yielding products with stronger antioxidant and enzyme inhibitory properties. In contrast, DESs based on neutral hydrogen bond donors such as urea, glycerol, or ethylene glycol facilitated the extraction of glucomannan and β-glucan-type polysaccharides from Bletilla striata [35], Ganoderma lucidum [14], and related sources. Additionally, innovative DES designs including temperature-responsive systems and mechanochemically formed DESs enabled efficient extraction under mild conditions, enhanced solvent reusability, and co-extraction of additional phytochemicals, as observed in Lycium barbarum [27], Lilium lancifolium [23], and Schisandra chinensis [36].
For example, a recent study showed that a lactic acid/proline DES (with modest water content) extracted nearly three times more polysaccharide from Acanthopanax biomass than hot water, and the DES-extracted polysaccharide had lower molecular weight and enhanced antioxidant activity [37]. Such findings underscore that beyond simply dissolving the polymers, DESs may modulate polysaccharide structure (e.g. by breaking certain linkages or enriching functional groups) in beneficial ways. Finally, the push for sustainable, “green” extraction technologies has catalyzed interest in natural deep eutectic solvents (NADES) – DESs made from entirely natural metabolites (like organic acids, amino acids, cholines, sugars) – which align with food and pharma regulations [7]. Collectively, DESs represent an emerging solvent system that meets the modern criteria of efficiency, selectivity, and sustainability in polysaccharide extraction. This review provides a comprehensive overview of DESs as sustainable and tunable media for polysaccharide extraction. It examines the physicochemical principles governing DES-polysaccharide interactions, highlights advances in extraction efficiency and structural preservation, and explores process intensification strategies, analytical tools, and emerging applications. The review also addresses future directions in AI-guided DES design, biotechnological integration, and sustainability to support the development of next-generation biorefinery platforms.

Fundamentals of DESs Relevant to Polysaccharide Systems

Physicochemical Properties of DESs: Implications for Biopolymer Interactions
The DESs are often described as analogues of ionic liquids, sharing the trait of extensive ionic and hydrogen-bond interactions, yet distinguishable by their simple formulation and safer components [1,38,39]. When one of the DES components is an active pharmaceutical ingredient, it is known as therapeutic DES (THEDES) [40,41,42,43,44,45,46]. A typical DES is a binary or ternary mixture comprising an HBA, often a quaternary ammonium salt such as choline chloride, and an HBD, which may include polyols (e.g., glycerol, ethylene glycol), amides (e.g., urea), or carboxylic acids (e.g., lactic or oxalic acid) [47]. Upon mixing in a specific molar ratio, these components self-associate into a eutectic phase via a dense network of hydrogen bonds, resulting in a dramatic melting point depression – the mixture becomes liquid at a temperature far below the melting points of the individual constituents [48]. This in situ generation of a solvent avoids the need for chemical synthesis or organic diluents, exemplifying facile preparation. From a physicochemical standpoint, DESs possess several properties that directly impact their interactions with polysaccharides such as their polarity and solvating power [9]. DESs can dissolve a wide range of substances, from metal oxides to biomolecules, due to their unique polarity profile. They often exhibit moderate to high polarity predominantly governed by hydrogen-bonding rather than purely dipolar interactions as shown in Table 2.
The wide range of solutes presented in Table 2 demonstrates the broad solvating capacity of DES. This versatility is primarily governed by the nature of the hydrogen bonding network, the polarity profile, and the structural flexibility of DESs, which can be tuned to interact effectively with different classes of compounds. While many entries focus on inorganic and low-molecular-weight organics, several studies clearly show that DESs are also capable of dissolving structurally complex biomolecules such as DNA, keratin, and notably, polysaccharides like cellulose and chitin. These findings suggest that the same molecular interactions that govern DES solubility for metals and bioactives are equally critical in the disruption of polysaccharide hydrogen-bond networks. As such, the mechanistic patterns observed across diverse solutes offer a conceptual bridge to better understand and optimize DES-based dissolution strategies specifically for polysaccharides in applications ranging from biomass processing to biopolymer modification.
Kamlet–Taft solvatochromic measurements of DESs indicate high HBD (α) and/or acceptor (β) parameters, depending on composition [7,76]. In general, a strong HBA character (high β) is crucial for solubilizing polysaccharides, as it enables the DES to accept hydrogen bonds from the polymer’s numerous –OH groups, thereby competing with the polymer’s internal H-bond network [7]. Indeed, comparative studies have shown that DESs with more basic acceptors (e.g. choline hydroxide or imidazole-based DESs) exhibit markedly better cellulose dissolution capacity than less basic ones [77]. Conversely, DESs dominated by hydrogen-bond donation (high α, as in acidic formulations) may protonate or interact strongly with anionic polysaccharides (like pectins), aiding their solvation through different mechanisms [78,79]. Unlike conventional molecular solvents, the polarity of a DES is highly tunable, and simple descriptors like dielectric constant or Hildebrand solubility parameter are often insufficient to predict polymer solubility [7]. This tunable polarity and hydrogen-bonding networks of DESs enable tailored solvation of recalcitrant polysaccharides such as cellulose. However, their inherently high viscosity can hinder mass transfer [80]. This can be mitigated by moderate heating or controlled water addition, which lowers viscosity without compromising solvent structure [7]. Ternary DESs further allow fine-tuning of viscosity and polarity. DESs are also thermally stable and non-volatile, supporting prolonged extraction under heat or assisted techniques (e.g. ultrasound, microwave) without solvent loss [81,82]. Their biocompatible nature and recyclability make them particularly attractive for food, pharmaceutical, and biomedical applications. Overall, the adjustable physicochemical properties of DESs directly enhance their efficiency and sustainability in polysaccharide extraction.

Hydrogen Bonding Networks and Viscosity Modulation in Polysaccharide-Compatible DESs

Hydrogen bonding is the defining interaction in DESs, both for their formation and their function as solvents [83,84]. In typical DESs, the HBA and HBD form an extensive hydrogen-bond network that drives the eutectic effect and imparts high viscosity [85]. For polysaccharide dissolution, the strength and flexibility of this network are pivotal. Tightly bound systems exhibit higher viscosity and reduce solute interaction, whereas more dynamic, loosely bonded DESs facilitate intermolecular exchange, enhancing polysaccharide solubilization [54].
One practical manifestation of this principle is seen in studies of cellulose dissolution. Ren et al. (2016) examined a series of choline chloride-based DESs and found that the one with the highest HBA basicity (choline chloride/imidazole) not only had the greatest cellulose solubility but also the lowest viscosity among the series [86]. The lower viscosity was attributed to weaker hydrogen bonding within the DES, as imidazole interacts less strongly with choline chloride than urea. This allows more hydrogen bonding capacity to be directed toward cellulose rather than internal DES interactions [86]. In essence, the DES serves as a reservoir of hydrogen bond donors and acceptors for the polysaccharide. Effective solvation requires a balance: if the internal HBD–HBA network is too stable, it restricts polymer access; if too weak, it lacks the cooperative strength to disrupt polymer bonds.
Viscosity in DESs correlates with the strength and persistence of internal hydrogen bonding, serving as an indirect indicator of hydrogen-bond coordination number and lifetime [87]. Studies have shown that DESs with higher viscosity exhibit stronger HBD–HBA interactions, limiting the availability of free hydrogen bond sites for solute interaction [88]. This reduces their capacity to disrupt and solubilize polysaccharide structures such as cellulose. In contrast, DESs with lower viscosity—due to weaker internal H-bonding—exhibit enhanced solvation efficiency by facilitating more accessible and dynamic hydrogen bonding with the polymer substrate [89].
For instance, Fan et al. (2021) reported that natural DESs based on multi-functional organic acids (capable of multiple H-bonding interactions) showed significantly higher viscosity than those based on monofunctional acids or simpler donors [89].
Beyond intrinsic viscosity, the spatial organization and mobility of the hydrogen-bond network critically influence the ability of DESs to infiltrate plant tissue and access embedded polysaccharides [90,91]. High-viscosity DESs may still dissolve cellulose, but their limited diffusivity often restricts effective penetration into dense biomass [92,93]. Strategic modulation of the H-bond network—via altered HBA structure, ternary components, or co-solvent incorporation—can markedly enhance mass transfer. For example, replacing choline chloride with allyl triethylammonium chloride in an oxalic acid-based DES reduced viscosity and improved cellulose solubilization, attributable to weaker chloride–oxalate interactions and lower dissolution activation energy [94]. Furthermore, controlled addition of co-solvents (e.g., water or ethanol) can disrupt and loosen the hydrogen-bond network and promote substrate access, though excessive dilution may compromise H-bond-mediated interactions [90]. These findings highlight the need for rational design of DESs that optimize both hydrogen-bond availability and transport properties to enable efficient extraction from recalcitrant biomass.

Tailoring Polarity and Solvent Microenvironments for Polysaccharide Affinity

The extraction efficacy of DESs arises not merely from their polarity or hydrogen-bonding potential, but from the ability to rationally design their microenvironment to match the chemical nature of target polysaccharides. This tunability enables DESs to act not as passive solvents but as interactive matrices that facilitate specific solvation mechanisms through hydrogen bonding, acid–base interactions, or even metal coordination [25,95].
The extraction efficiency of DESs relies on their capacity to engage in specific interactions—ranging from hydrogen bond disruption to protonation or Lewis acid coordination—enabled by tailored polarity, pH, and ionic strength. Such behavior can be rationalized using solvatochromic parameters (α, β, π*), which guide the design of DESs with optimized affinity for different polysaccharide types [96,97].
More specialized DESs incorporate metal salts such as AlCl₃, FeCl₃, or ZrOCl₂, which act as Lewis acids capable of coordinating to electron-donating sites within lignocellulosic structures [98]. These metal-containing DESs facilitate the cleavage of ether and ester bonds—particularly β-O-4 and lignin–carbohydrate linkages—resulting in enhanced delignification and improved accessibility of cellulose and hemicellulose [99,100]. For example, a FeCl₃–glycerol DES achieved a glucose yield of 91.1% after enzymatic hydrolysis, indicating effective polysaccharide release [100]. Additionally, the polarity and pH of DESs can be tuned to favor selective fractionation. Acidic DESs promote delignification, while alkaline DESs—such as choline hydroxide–based or glycerol–K₂CO₃ systems—selectively cleave lignin–carbohydrate ester bonds, thereby preserving polysaccharides like cellulose and hemicellulose [101,102]. Such selective behavior enables one-pot fractionation of biomass into purified carbohydrate and lignin streams.
Therefore, fine-tuning DES composition, such as by introducing ternary components or minimal water content, enables adjustment of viscosity and diffusivity to support structure-sensitive extraction. This design flexibility allows DESs to selectively target distinct polysaccharide–matrix interactions, aligning solvent function with specific bonding patterns in complex biomass.

Mechanistic Insights into DES–Polysaccharide Interactions

Effective extraction of polysaccharides from biomass hinges on the ability of solvents to disrupt both amorphous and crystalline domains within the polymer matrix [103]. The DESs achieve this primarily through competitive hydrogen bonding, wherein solvent components interact with the hydroxyl, carboxyl, or amino groups of polysaccharide chains, thereby displacing the intra- and intermolecular hydrogen bonds that stabilize native polymer conformations [91].
Figure 1 is a schematic representation of DES-mediated polysaccharide extraction. DESs penetrate biomass and disrupt intra- and intermolecular hydrogen bonds by interacting with hydroxyl and carboxyl groups, leading to matrix swelling and enhanced solubilization. This process enables the efficient recovery of polysaccharides from plant, algal, and fungal sources under mild conditions, with minimal structural degradation.
In amorphous domains, characterized by irregular chain packing and high free volume, DES molecules readily infiltrate and form hydrogen bonds with exposed functional groups [91]. This leads to matrix swelling, chain disentanglement, and eventual dissolution. Such behavior is particularly pronounced in loosely structured polysaccharides such as pectins [104,105], hemicelluloses [106], and inulin-type fructans [107,108], where microscopy and histological evidence consistently reveal significant tissue expansion, wall rupture, and cell layer delamination upon DES exposure [109]. By contrast, crystalline domains, such as those in cellulose microfibrils or native chitin, resist solvent penetration due to their dense, regularly ordered hydrogen-bonding network and van der Waals interactions. Standard DESs (e.g., choline chloride–urea) show limited capacity to solubilize such regions under ambient conditions, primarily extracting non-crystalline fractions. Nonetheless, DES pretreatment can effectively remove amorphous polysaccharides and open the microstructure, thereby enhancing the accessibility of crystalline regions to further processing (e.g., enzymatic hydrolysis or secondary solvation) [110].
Under elevated temperatures, or when combined with ultrasound or microwave irradiation, more aggressive DES systems—particularly those with high hydrogen-bond acceptor strength or metal-coordinating species—can partially disrupt crystalline architectures [111]. Mechanistically, this involves stepwise binding to hydroxyl-rich chain surfaces, insertion into lattice voids, and progressive weakening of the hydrogen-bond network. This transition from rigid crystallinity to a swollen intermediate phase is supported by X-ray diffraction, which shows reductions in crystallinity index, and by electron microscopy, which reveals collapse and fibril delamination in treated tissues [61].
Importantly, not all polysaccharides contain all three structural domains. For example, pectins and β-glucans are predominantly amorphous and dissolve readily, while cellulose and chitin exhibit strong crystalline ordering and require more intensive processing. Hemicelluloses and partially deacetylated chitosan may exhibit both amorphous and semi-ordered regions, resulting in intermediate solvation behavior. The extent to which each polysaccharide presents crystalline, amorphous, or interfacial architecture—determined by its biosynthetic origin and supramolecular organization—directly influences its interaction with DESs and the mechanisms by which dissolution proceeds. A comparative overview of these structural distinctions across major polysaccharide classes is shown in Table 3, associating the domain composition with solvation behavior and extraction efficiency under DES conditions.
The patterns summarized in Table 3 suggest a structure–responsive framework, wherein the domain architecture of polysaccharides—whether predominantly amorphous, crystalline, or intermediate—plays a critical role in determining their behavior in DES systems. Amorphous polysaccharides generally exhibit higher extractability under mild, polar DES conditions, attributed to their accessible hydroxyl-rich surfaces and reduced molecular packing [105,127]. In contrast, highly crystalline polysaccharides such as cellulose and chitin tend to display limited solubility unless subjected to strong hydrogen bond acceptors, elevated temperatures, or mechanical or enzymatic pretreatment [128,129]. Polysaccharides with intermediate structures, including hemicellulose and chitosan, show partial responsiveness, with solubility modulated by factors such as branching, acetylation, and charge distribution [109,130]. These observations underscore the potential of leveraging domain-level structural features to tailor DES systems—adjusting properties such as acidity, polarity, viscosity, or the inclusion of functional additives—to enable selective, efficient, and structure-preserving extraction across diverse biomass sources.
The patterns summarized in Table 3 suggest a structure–responsive framework, wherein the domain architecture of polysaccharides—whether predominantly amorphous, crystalline, or intermediate—plays a critical role in determining their behavior in DES systems. Amorphous polysaccharides generally exhibit higher extractability under mild, polar DES conditions, attributed to their accessible hydroxyl-rich surfaces and reduced molecular packing [105,127]. In contrast, highly crystalline polysaccharides such as cellulose and chitin tend to display limited solubility unless subjected to strong hydrogen bond acceptors, elevated temperatures, or mechanical or enzymatic pretreatment [128,129]. Polysaccharides with intermediate structures, including hemicellulose and chitosan, show partial responsiveness, with solubility modulated by factors such as branching, acetylation, and charge distribution [109,130]. These observations underscore the potential of leveraging domain-level structural features to tailor DES systems—adjusting properties such as acidity, polarity, viscosity, or the inclusion of functional additives—to enable selective, efficient, and structure-preserving extraction across diverse biomass sources.

Role of DES Composition in Breaking Glycosidic and Hydrogen Bonding Networks

The composition of a DES plays a decisive role in determining its interaction with polysaccharides, governing whether the solvent primarily disrupts non-covalent interactions or actively cleaves covalent glycosidic bonds [9]. This functional distinction stems from the acid–base properties, hydrogen-bonding capacity, and potential catalytic activity of the DES constituents [131,132].
Neutral or basic DESs (e.g., choline chloride with urea, imidazole, or acetate) predominantly act through competitive hydrogen bonding. These systems destabilize the extensive intra- and inter-chain hydrogen bonds in polysaccharides—particularly in cellulose and hemicelluloses—without significantly affecting the glycosidic linkages [133,134]. Solubility enhancement correlates with the basicity of the HBA; for instance, imidazole-based DESs exhibit superior cellulose solubilization compared to urea-based systems due to stronger competition for hydroxyl protons [77]. Polysaccharides recovered from such systems typically retain high molecular weights, indicating structural preservation.
In contrast, acidic DESs—often formulated with carboxylic acids (e.g., lactic, oxalic, malic acids)—can catalyze partial hydrolysis of glycosidic bonds. These systems provide a protic environment sufficient to protonate ether oxygen atoms in glycosidic linkages, enabling acid-catalyzed cleavage [135]. Experimental evidence shows that polysaccharides extracted using acidic DESs often exhibit reduced molecular weight, elevated reducing sugar content, and modified monomeric profiles [78,132]. For example, extraction with choline chloride–maltose NADESs yielded pectins enriched in galacturonic acid monomers, consistent with depolymerization [136]. Similarly, malic acid–based systems increased oligosaccharide yield and bioactivity in Acanthopanax extracts [30].
Additional compositional factors influence reactivity. Chloride-containing DESs (e.g., choline chloride) may enhance solubilization through specific anion–hydroxyl interactions [137]. Metal salt-based DESs (e.g., ZnCl₂, FeCl₃ systems) introduce Lewis acidic sites capable of coordinating to glycosidic oxygen atoms, weakening C–O bonds and facilitating hydrolysis [138]. Moreover, controlled water addition (~10–30%) can increase proton mobility and transition state stabilization, thereby enhancing hydrolytic efficiency without excessive dilution of solvent polarity [139].
Altogether, DES composition can be strategically modulated to yield either intact high-molecular-weight polysaccharides or short-chain oligosaccharides and monomers, depending on the intended application. This dual capability highlights the importance of mechanistically guided DES selection, wherein acidity, basicity, and catalytic potential are tailored to the structural and functional goals of polysaccharide extraction.

Enhancing Polysaccharide Solubility and Dispersibility Using DESs

Beyond extraction, DESs enable the dissolution and dispersion of structurally recalcitrant polysaccharides such as cellulose and chitin, which are otherwise insoluble in water or conventional solvents due to extensive hydrogen bonding and crystallinity [140]. DESs disrupt these interactions by forming new hydrogen-bond networks with the polymer, facilitating dissolution [115].
For example, Zhang et al. (2020) has evaluated several choline chloride-based DESs—including oxalic acid/ChCl, citric acid/ChCl, and urea/ChCl—and found oxalic acid/ChCl to be the most effective, fully dissolving cellulose at elevated temperatures. The regenerated product exhibited a transformation from cellulose I to cellulose II, as confirmed by XRD analysis [141].
Enhancing usability even further, Li et al. (2024) formulated a DES from tetramethylammonium hydroxide pentahydrate and urea (1:3 molar ratio) capable of dissolving up to 7.5 wt% cellulose at room temperature, producing regenerated cellulose with a reduced degree of polymerization (DP = 526) and altered crystallinity—both indicators of disrupted polymer networks and increased dispersibility [142]. Moreover, Yang et al. (2022) employed ternary DESs, such as choline chloride–oxalic acid–malonic acid, to pretreat bagasse cellulose at 90 °C for 4 hours, achieving a 71.6% lignin removal and boosting cellulose crystallinity to 67.6%, which facilitated not just solubility but also the downstream dispersibility of cellulose fibers [143].
Even without full solubilization, DES pretreatment can reduce crystallinity and molecular weight, enhancing aqueous dispersibility [144]. For instance, levulinic acid–based DESs applied to moso bamboo caused microstructural disruptions such as the formation of ~30 nm voids and fibril cracking, resulting in shorter cellulose crystallites and improved enzymatic accessibility, even without full dissolution [144].
In another case, an arginine:lactic acid DES (1:7) used with microwave assistance decreased the crystallinity index of bamboo cellulose from 67.2% to 53.0%, while also reducing crystallite size from 3.41 nm to 3.14 nm, leading to a dramatic increase in saccharification yield from 6.3% to 81.9% [145]. Similarly, choline chloride:urea DES (1:2) applied to oil palm empty fruit bunch (OPEFB) at 110 °C for 4 hours reduced cellulose crystallinity as confirmed by XRD, and improved glucose yield to 66.3 mg/ml despite partial retention of lignin and hemicellulose [146]. Finally, ternary DES pretreatment of wheat straw achieved ~69.5% lignin removal, surface erosion, and crystallinity alteration, leading to a 5.1-fold increase in sugar yield after enzymatic hydrolysis [147].
Collectively, these results confirm that DESs can induce partial deconstruction of polysaccharide networks, enabling better water interaction and dispersibility without requiring complete dissolution.

In Situ vs. Pre-Formulated DES

When deploying DESs in polysaccharide processing, one can either pre-formulate the DES (by mixing and heating its components in advance) or generate the DES in situ during the extraction/processing step. The conventional approach uses pre-formulated DESs: a well-characterized solvent mixture (e.g. choline chloride–urea at 1:2 molar ratio) is prepared beforehand and then applied to the biomass. This ensures consistent properties (viscosity, pH, H-bond donor/acceptor ratio) and reproducibility in performance. Pre-formulated DESs have been the standard in most studies, enabling researchers to screen a variety of solvent compositions systematically [148]. However, handling certain DESs can be challenging due to their high viscosity and tendency to solidify at room temperature, particularly for common formulations such as choline chloride–glycerol or choline chloride–urea. These properties significantly affect their pumpability and mixing efficiency during processing and scale-up. For example, DESs like ChCl:Urea (1:2) have been reported to exhibit very high viscosities at low temperatures, which dramatically decrease only at elevated temperatures above 60 °C [149].
This introduces a need for heating steps and energy input when handling large volumes. Moreover, viscosity modeling studies emphasize that energy requirements for industrial-scale use are closely linked to the DES formulation, further complicating process design and operational logistics [150]. To address the challenges posed by the high viscosity of many DESs—a key limitation in large-scale applications due to increased pumping and mixing energy demands—Benguerba et al. (2019) developed predictive models for the viscosity of amine-based DESs [150]. They employed a quantitative structure–property relationship (QSPR) approach based on COSMO-RS-derived Ss-profile molecular descriptors, which describe the surface polarity distribution of solvent components. Two modeling techniques were used: multilinear regression (MLR) and artificial neural networks (ANN). The MLR model, trained on 108 experimental viscosity data points, achieved a coefficient of determination R² = 0.9305, while the more advanced ANN model demonstrated exceptional predictive power with R² = 0.9975 for training and R² = 0.9863 for validation, along with a root mean square error (RMSE) of just 0.0531 [150]. These models enable accurate viscosity predictions based solely on molecular structure and temperature, allowing researchers to screen and optimize DES formulations for low viscosity, thereby reducing energy input and improving process feasibility for industrial-scale applications. As a result, selecting or engineering low-viscosity DESs is often a prerequisite for energy-efficient and scalable applications.
On the other hand, in situ formation of DESs is emerging as a promising strategy to simplify biomass processing workflows. In this approach, the hydrogen bond donor (HBD) and hydrogen bond acceptor (HBA) are added separately to the biomass or extraction medium, where they interact and form the eutectic mixture directly on-site. This eliminates the need for prior DES preparation, reduces energy and solvent use, and enhances efficiency. For example, Liu et al. (2022) demonstrated a mechanochemical method in which plant polysaccharides served as in situ HBDs, reacting with choline chloride to form a DESys (deep eutectic system) during extraction [151]. This approach not only improved polysaccharide recovery but also maintained their structural integrity while simplifying purification steps. This concept is exemplified in the mechanochemical extraction of Dendrobium officinale, wherein the polysaccharides themselves acted as functional components in solvent formation [151]. In this approach, choline chloride was directly combined with the plant powder and subjected to mechanochemical extraction, allowing the hydroxyl-rich polysaccharide chains to serve as hydrogen bond donors during eutectic assembly. Similarly, Wang et al. (2024) reviewed the growing use of DESys in extractions, emphasizing that in situ DES formation allows better solute-solvent compatibility and one-step processing, which enhances efficiency and lowers environmental impact [152].
Similarly, Lim et al. (2024) used in situ-formed DES combined with ultrasound to extract nanocellulose from durian husk. Their one-pot method achieved a high cellulose nanofibril yield of 58.22% and reduced lignin content, indicating effective deconstruction of the biomass matrix [153]. These cases illustrate that in situ DES formation not only enhances polysaccharide solubilization and extraction yields but also supports greener, more integrated workflows by minimizing pretreatment steps and chemical waste.
Despite these potential benefits, in situ DES systems are largely exploratory at present. One concern is achieving the correct molar ratios and homogeneity directly in the extraction vessel, especially at larger scales. If the components do not mix intimately, the full depression of melting point and solvating power of the DES may not be realized. There is also less control over water content; moisture from the biomass could alter the DES’s properties unpredictably. By contrast, pre-formulated DESs offer known, optimized compositions and can be characterized for reusability and stability prior to use. Thus, a current view is that pre-formulated DESs provide the reliability needed for most polysaccharide extractions, whereas in situ DES formation holds promise for simplifying certain processes. As research progresses, we may see hybrid approaches to combine the convenience of in situ formation with the precision of pre-formulation

AI, ML, and Biotechnological Innovations in DES–Polysaccharide Research

In recent years, artificial intelligence (AI) and machine learning (ML) techniques have become instrumental in accelerating the development of DESs, particularly for applications in solubilization and extraction. The traditional trial-and-error approach in DES research is often time-consuming and inefficient due to the nearly limitless combinations of HBDs and HBAs. AI offers a transformative solution by enabling high-throughput screening and predictive modeling of DES properties based on molecular features.
One pioneering study demonstrated the machine-learning-assisted design of pharmaceutically acceptable DESs for enhancing the solubility of non-selective COX inhibitors like ibuprofen and ketoprofen [154]. Using COSMO-RS molecular descriptors and experimental solubility data, a predictive model was developed that accurately forecasted solubility across several DES formulations [154]. The authors emphasized that “a machine learning approach utilizing COSMO-RS descriptors enables the rational design and solubility prediction of DES formulations” and effectively replaces traditional labor-intensive solubility testing [154].
A parallel advancement in DES discovery came through the development of ML models based on hydrogen bond (HB) network characteristics, critical to DES formation. Abbas et al. (2024) extracted molecular dynamics data from 38 known DES and 111 non-DES systems and identified two key HB features distinguishing DES: an imbalance in intra-component HBs and a dominance of strong inter-component HBs [155]. These insights were translated into HB-based descriptors to train 30 ML models, where the Extra Trees Forest model achieved the highest predictive accuracy (ROC-AUC = 0.88) [155]. The predictive modeling of physical properties, such as viscosity—a critical parameter in extraction processes—has also been significantly improved through AI. A 2024 study developed models using Support Vector Regression (SVR), Feedforward Neural Networks (FFNN), and CatBoost on one of the most extensive DES viscosity datasets [156]. The CatBoost model, leveraging COSMO-RS-derived σ-profile descriptors, achieved excellent accuracy with an R² of 0.99 and an average absolute relative deviation (AARD) of 5.22% [156]. The authors also employed SHapley Additive Explanations (SHAP) to interpret model outputs, enhancing the transparency of predictions and aiding solvent selection.
In the context of biomass and polysaccharide extraction, AI is increasingly utilized to fine-tune DES-based extraction processes. For example, Firouzi et al. (2024) applied a suite of ML models, including Random Tree and Multilayer Perceptron, to predict and optimize cellulose extraction from hemp bast fiber using DESs [157]. Based on experimental data from response surface methodology (RSM), the Random Tree model achieved the highest predictive capability with an R² of 0.8548. The study showed the capabilities of AI models in enabling more precise process optimization.
Finally, moving beyond predictive modeling, researchers have begun exploring generative AI for DES discovery. Luu et al. (2023) implemented a transformer-based diffusion model capable of proposing novel solvent candidates while optimizing for multiple objectives like viscosity, stability, and solubility. The authors described their framework as a multi-task generative model capable of integrating distinct chemical objectives into a unified design platform [158].
Despite these technological advances, the application of AI and ML in DES research brings with it a number of ethical considerations that cannot be overlooked. A primary concern is transparency [159, 160] and reproducibility [161, 162]. Many ML models, especially deep neural networks and generative algorithms, operate as "black boxes," offering limited interpretability [163, 164]. In contexts like pharmaceutical or food-grade DES development, such opacity can hinder trust and regulatory acceptance [165]. Tools like SHAP and model-agnostic explainability methods help address this [166], but their adoption must become standard rather than optional.
Furthermore, the quality and representativeness of training data directly affect AI model outputs [167-170]. If datasets are biased, favoring certain chemical categories, temperature ranges, or solvent types, the resulting models may generalize poorly and could misguide experimentalists [171, 172]. Ethical AI in this field requires rigorous dataset curation, documentation, and periodic auditing for chemical diversity and inclusion [172]. There is also the issue of equity and accessibility. High-performance AI tools, along with large proprietary datasets, may be available only to well-funded institutions or countries, potentially widening the gap in global green chemistry research [173]. To address this, researchers and publishers should consider open-source models, shared datasets, and collaborative platforms. Finally, over-reliance on computational predictions poses a subtle but important ethical risk. While AI can reduce the experimental burden, it should not substitute for validation. Especially in health-related or environmentally sensitive applications, models should support—not replace—critical empirical testing and peer-reviewed evaluation. Collectively, AI and ML hold remarkable potential to accelerate DES research and enable greener, more efficient extraction processes. However, their ethical deployment requires a thoughtful commitment to transparency, inclusiveness, and responsible innovation.

Challenges and Future Directions

While DESs offer a promising approach for polysaccharide extraction, several critical challenges limit their broader application. High viscosity, common in sugar- and polyol-based DESs, hinders mass transfer and increases energy demands for mixing and separation [80]. Mitigation strategies include dilution with water, elevated temperatures, reactor innovations, and designing inherently lower-viscosity formulations. Product recovery is another hurdle, as the non-volatile nature of DESs complicates separation from extracted polysaccharides [174]. Solutions under exploration include anti-solvent precipitation, thermoresponsive phase separation, and direct formulation of DES extracts for end-use, each with trade-offs in cost and process complexity [174]. The selection of effective DESs remains largely empirical due to the vast formulation space. Heuristics guide current practice, but this limits discovery. Emerging computational tools—including machine learning and COSMO-RS modeling- offer a path toward predictive solvent design based on polysaccharide characteristics [175]. On the industrial scale, economic and engineering constraints must be addressed. While many DES components are affordable, others may be corrosive or costly. Integration into biorefinery workflows may require pre-treatment steps and additional purification to handle co-extracted impurities [176]. Regulatory and intellectual property issues also influence commercialization. Patents on specific DES systems may restrict freedom to operate, while standardized safety and residue guidelines are still developing. Looking ahead, promising directions include task-specific DESs with built-in reactivity, enzyme-compatible solvents for integrated processing, and AI-guided high-throughput screening for accelerated optimization. Modular, continuous extraction systems could enhance scalability and solvent recyclability. Overall, addressing these limitations will require coordinated advances in solvent chemistry, process design, and data-driven modeling, supported by the growing demand for sustainable, efficient bioprocessing solutions.

5. Conclusions

This review comprehensively elucidates the mechanistic basis and structural considerations underpinning the application of deep eutectic solvents (DESs) in the extraction polysaccharides. By correlating the physicochemical properties of DESs with the supramolecular organization of polysaccharides, this work introduces a domain-responsive framework that facilitates rational solvent selection based on polymer architecture, specifically, the predominance of amorphous, crystalline, or interfacial domains. Such an approach enables a shift from empirical solvent choice toward a structure-guided extraction strategy. In addition, this review highlights the role of DES composition not merely as a solubilization medium but as a modulator of polysaccharide characteristics, including molecular weight distribution, functional group enrichment, and bioactivity. Recent advancements, including in situ DES formation, mechanochemically assisted systems, and stimulus-responsive formulations, are critically evaluated as emerging tools for enhancing process efficiency and reducing downstream processing demands. Finally, the integration of machine learning and COSMO-RS-based predictive models is discussed as a forward-looking strategy to accelerate solvent design. Collectively, this review contributes a novel, structure-informed perspective to the field, offering a conceptual and methodological basis for advancing DES-based extraction within polysaccharide research and bioprocessing.

Conflicts of Interest

The authors declare no conflicts of interest.

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Figure 1. Schematic representation of DES-mediated polysaccharide extraction. DESs disrupt hydrogen bonds within biomass, promoting matrix swelling and polysaccharide solubilization.
Figure 1. Schematic representation of DES-mediated polysaccharide extraction. DESs disrupt hydrogen bonds within biomass, promoting matrix swelling and polysaccharide solubilization.
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Table 1. Representative DES-based polysaccharide extractions: systems, methods, and performance advantages.
Table 1. Representative DES-based polysaccharide extractions: systems, methods, and performance advantages.
Source Polysaccharide Type DES Extraction Method/System Benefit/Remarks vs. Conventional Reference
Dioscorea opposita Crude polysaccharides Choline chloride + 1,4-butanediol (ultrasound-assisted) Higher yield than hot water or water-ultrasound extraction [8]
Ganoderma lucidum β-glucan-rich polysaccharides Choline chloride + guaiacol + lactic acid (ternary DES) 94.7 mg/g yield; stable reuse; superior due to strong hydrogen bonding [9]
Saccharina japonica Alginate, Fucoidan DES + subcritical water hydrolysis High yields of alginate (28.1%) and fucoidan (14.9%) [10]
Sargassum horneri Sulfated polysaccharides Choline chloride + 1,2-propanediol (ultrasound-assisted) Better removal of impurities and higher antioxidant activity [11]
Fucus vesiculosus Sulfated fucose-rich polysaccharides Microwave-assisted DES: choline chloride + 1,4-butanediol 116.3 mg/g yield; strong antioxidant and anticancer activity [12]
Poria cocos (1→3)-β-D-glucan-rich branched glucans Choline chloride + oxalic acid DES 8.6x yield over hot water; good recyclability [13]
Ganoderma lucidum Acidic heteropolysaccharides composed primarily of glucose, galactose, and glucuronic acid Temperature-responsive DES Polysaccharides recovered at UCST; green and recyclable system [14]
Maca Crude maca polysaccharides (unspecified heteropolysaccharide mixture) Choline chloride + urea (ultrasound-assisted) 2x yield over water; strong antioxidant and prebiotic benefits [15]
Polygonatum kingianum Crude polysaccharide (uncharacterized) Choline chloride: glycerol (1:2), NADES 2.5x higher yield than water; boosts IL-6 and iNOS in macrophages [16]
Pericarpium Citri Reticulatae Acidic heteropolysaccharide (PCRPs-1) rich in galactose, rhamnose, and uronic acids Ultrasound-assisted DES 5.41% yield vs. 3.92% (water); antioxidant and antidiabetic effects [17]
Abalone viscera Marine-derived acidic heteropolysaccharide rich in galactose and glucuronic acid (AVP) Choline chloride + ethylene glycol (1:3 molar ratio), 25% water, ultrasound-assisted Higher yield (17.32%), enhanced glucuronic acid content, lower Mw (53.33 kDa), stronger antioxidant activity than hot water extraction [18]
Black truffle Crude black truffle polysaccharide (uncharacterized) Betaine + citric acid NADES (ultrasound-assisted) 11x yield over ethanol; antioxidant and anti-aging bioactivity [19]
Dandelion Crude dandelion polysaccharides (likely inulin-type fructans, arabinogalactans, and/or pectic polysaccharides) Ultrasound-assisted NADES (Choline chloride:Oxalic acid 1:2; 60% water) Higher yield (68.5 mg/g) and purity (0.88 mg/mg); outperforming traditional methods; green and cost-effective [20]
Lentinus edodes Heteropolysaccharide (Glucose:Galactose:Mannose ≈ 32.9:1:2.54) Subcritical Water Extraction (SWE) + ChCl–Malonate (1:2) DES 19.2% more yield than SWE; better antioxidant profile [21]
Acanthopanax senticosus Glucose-based heteropolysaccharide 3c-DES (betaine:triethanolamine:MgCl₂·6H₂O = 1:4:0.08, molar ratio); ethanol precipitation Simultaneous extraction of saponins and polysaccharides [22]
Lilium lancifolium Crude heteropolysaccharides (glucose-, galactose-, arabinose-, mannose-containing) Choline chloride–ethylene glycol (ChEtgly, 1:2) with 20% water, ultrasound-assisted at 50 °C for 40 min Comparable yield to hot water extraction in 1/3 the time; simultaneous phenolic acid co-extraction; green solvent advantage [23]
Eucommia ulmoides Acidic heteropolysaccharides (mannose, rhamnose, galacturonic) Choline chloride + oxalic acid (ultrasound-assisted) 2.3x yield vs. water; strong antioxidant and enzyme inhibition [24]
Dendrobium devonianum Glucose-based heteropolysaccharide (α-/β-glucans) Mechanochemical self-forming DESys No external HBD needed; high efficiency and bioactivity [25]
Polygonatum sibiricum Galactose- and mannose-rich heteropolysaccharide (DPSP-3) Choline chloride:oxalic acid (1:1, m/m) DES at 70 °C for 40 min 15.62% yield (1.53× higher than water extraction); enriched in galactose (65.75%) and mannose (19.76%); improved immunomodulatory activity (ROS, NO, IL-6, TNF-α release in RAW264.7) [26]
Lycium barbarum Low-MW heteropolysaccharides (glucose-rich LBP) Temperature-switchable DES (tetracaine:lauric acid, 1:1; 70 wt%) 465 mg/g yield; recyclable; strong antioxidant profile [27]
Anji white tea Acidic arabinogalactan-type heteropolysaccharide Choline chloride + 1,6-hexanediol (ultrasound-assisted) Higher yield and antioxidant activity vs. water [28]
Grape seed Heteropolysaccharide (mannose, glucose, galactose, arabinose) pH-switchable DES: dodecanoic acid + octanoic acid 98 mg/g yield; reusable 25x; green alternative to t-butanol [29]
Acanthopanax senticosus root Acidic heteropolysaccharide (rich in galacturonic acid, arabinose, galactose) L-malic acid + L-proline (ultrasound-assisted) 2.6x higher yield than hot water; strong antioxidant activity [30]
Chrysanthemum morifolium Pectin (RG-I-rich) DES (urea:choline chloride or 1,2-PG:ChCl) D2: 83.5% RG-I domain; low GalA; enhanced prebiotic activity vs. inulin [31]
Morchella importuna Acidic heteropolysaccharide (GlcN, Gal, Glc, Man; 0.39:1.88:3.82:3.91) Choline chloride + oxalic acid (2:1), 90% H₂O 4.5× higher yield than HWE; higher carbohydrate (85.3%) and sulfate content (34.2%); enhanced antioxidant and α-glucosidase inhibitory effects [32]
Astragalus membranaceus Astragalus polysaccharides (APS); heteropolysaccharides containing Glc, Gal, Ara, Rha, Man Choline chloride + oxalic acid (ultrasound-assisted) Increased yield, reduced impurities vs. conventional [33]
Camellia oleifera Pectic-like heteropolysaccharide (rich in Ara, Glc, Gal, Rha, GalA, GlcA) Choline chloride + propionic acid + 1,3-butanediol (DES-28; ternary) 1.5× higher yield than hot water; enhanced antioxidant and hypoglycemic activity [34]
Bletilla striata Glucomannan Choline chloride + urea ↑Yield (36.77%), ↑Antioxidant activity (DPPH, ABTS, FRAP), recyclable DES [35]
Schisandra chinensis Galacturonic acid-rich pectic polysaccharide Ethanolamine:4-Methoxyphenol (1:1) 1.39× higher yield vs. water; recyclable TRDES; simultaneous lignanoid extraction [36]
1 Abbreviations, DES: Deep eutectic solvent, NADES: Natural deep eutectic solvent, DESys: Deep eutectic systems (in situ-formed DES), TRDES: Temperature-responsive deep eutectic solvent, UCST: Upper critical solution temperature, ChCl: Choline chloride, 1,2-PG: 1,2-Propanediol, ChEtgly: Choline chloride–ethylene glycol, SWE: Subcritical water extraction, HBD: Hydrogen bond donor, LBP: Lycium barbarum polysaccharide, DPSP-3: Polygonatum sibiricum polysaccharide fraction 3, APS: Astragalus polysaccharides, RG-I: Rhamnogalacturonan-I, GalA: Galacturonic acid, HWE: Hot water extraction, DPPH: 2,2-Diphenyl-1-picrylhydrazyl, ABTS: 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), FRAP: Ferric reducing antioxidant power, IL-6: Interleukin-6, iNOS: Inducible nitric oxide synthase, ROS: Reactive oxygen species, NO: Nitric oxide, TNF-α: Tumor necrosis factor-alpha.
Table 2. Representative solutes dissolved in deep eutectic solvents (DESs), highlighting mechanistic insights into solvation behavior and dissolution efficiency.
Table 2. Representative solutes dissolved in deep eutectic solvents (DESs), highlighting mechanistic insights into solvation behavior and dissolution efficiency.
Soluble Substances Mechanism/Insight Reference
Cu, Fe, Pb, Zn (oxides, sulfates, sulfides) Sulfates dissolve best; solubility ~100× higher due to enhanced coordination in DES. [49]
LiCoO₂, Lithium cobalt oxide Reductive dissolution via ascorbic acid and PEG-based DES with 84.2% Co leaching. [50]
Lipids, proteins, carbohydrates NaDES polarity and viscosity enhance biomolecule extraction. [51]
DNA, starch, gluten, bioactives Natural DESs dissolve biopolymers via extensive hydrogen bonding networks. [52]
CuO, ZnO, MgO, CaO, Fe₂O₃ Thermodynamic favorability and morphology changes improve solubility. [53]
Cellulose Partial bonding and enhanced H-bonding increase cellulose solubility in ChCl–resorcinol DES. [54]
Uranium oxide (UO₃) Coordination with TOPO and HTTA in hydrophobic DESs achieves high solubility. [55]
Toluene (reaction medium) DESs activate H₂O₂ via H-bonding and low viscosity, enhancing oxidation reactions. [56]
UO₂, U₃O₈, UO₃ Strong hydrogen bonding in PTSA:ChCl DES enables uranium oxide dissolution. [57]
CO₂, SO₂, H₂S, aromatic bioactives DESs solvate via selective polarity and hydrogen bonding matched to target compounds. [58]
PbO, CuO, Fe₂O₃, ZnO Acidic DESs use H-bond networks and phase behavior to dissolve metal oxides. [59]
Metal oxides, salts, polar organics Ionic interactions and hydrogen bonds enhance solubility of diverse substances. [60]
Chitin Novel DESs using TMBAC and acids dissolved chitin up to 12% and enhanced enzymatic hydrolysis 2×. [61]
CnTAB surfactants (micelles) Micelle formation in DESs depends on solvent microstructure and hydrogen bonding. [62]
HgO, HgCl₂ Complete dissociation via Cl⁻ coordination in DES; H-bond donors don’t replace chloride ligands. [63]
Metal oxides, drugs, flavonoids, phenols Broad solubility via strong hydrogen bonding, high polarity, and solvent customization. [64]
Fe₃O₄, CuO, ZnO, PbO Chloroacetic acid DESs with ammonium bromides dissolve oxides through optimized H-bonding. [65]
Rutin High solubility in ChCl:propanediol/urea DES due to hydrogen bonding and polarity. [66]
PbO [PbO·Cl·EG]⁻ species formation drives dissolution in ChCl–EG DES. [67]
Keratin (animal hair) Sulfur-containing DESs disrupt protein structure, achieving up to 79% solubility. [68]
Metal oxides from lithium-ion batteries DES decomposition products (e.g., Cl₃⁻) promote oxidative dissolution. [69]
DNA Solubility depends on hydrogen bonding strength and ionic conductivity in DES. [70]
Bioactive pharmaceutical ingredients DES polarity and hydrogen bonding tailored to drug properties, improving solubility. [71]
Metal salts, oxides, phosphates Solubility varies with DES pH and polarity; acidic DESs dissolve oxides effectively. [72]
MgFe₂O₄, ZnFe₂O₄, CoFe₂O₄, NiFe₂O₄ DESs enable low-temp synthesis and precursor dissolution for ferrite nanoparticles. [73]
Co, Cu, Zn, Fe, Ni, Mn oxides Temp/time-dependent coordination and solubilization in choline chloride–acid DES. [74]
Cellulose ZnCl₂ hydrate–acrylic acid DES disrupts cellulose H-bonding for efficient dissolution. [75]
APIs (Fluconazole, mometasone furoate, Risperidone, diclofenac diethylamine, azelaic acid, tadalafil) THEDES systems can dissolve APIs by transforming the crystalline drug into a supramolecular liquid mixture. [40,41,42,43,44,45,46]
2 Abbreviations, DES: Deep eutectic solvent, NaDES: Natural deep eutectic solvent, ChCl: Choline chloride, PEG: Polyethylene glycol, TOPO: Trioctylphosphine oxide, HTTA: Thenoyltrifluoroacetone, PTSA: p-Toluenesulfonic acid, TMBAC: Trimethylbenzylammonium chloride, CnTAB: Alkyltrimethylammonium bromide (where n denotes carbon chain length), EG: Ethylene glycol, THEDES: Therapeutic deep eutectic solvent, API: Active pharmaceutical ingredient.
Table 3. Domain-level classification of major polysaccharides with structural features and implications for extraction using deep eutectic solvents (DESs).
Table 3. Domain-level classification of major polysaccharides with structural features and implications for extraction using deep eutectic solvents (DESs).
Polysaccharide Biological Source Dominant Domain(s) Structural Features Implication for DES Extraction Key Reference
Cellulose Plant cell walls Crystalline > Interfacial Linear β(1→4)-Glc; extensive hydrogen bonding; microfibrillar Requires strong HBAs or heat/ultrasound; limited solubility in mild DESs [112,113,114]
Pectin (RG-I, HG) Plant middle lamella Amorphous Galacturonic acid-rich; HG linear, RG-I branched Readily extracted by acidic DESs; mild DESs preserve structure, promote bioactivity [104,105]
Hemicellulose Secondary plant walls Amorphous + Interfacial Heterogeneous; short chains; variable composition Extractable under mild DESs; solubility depends on sugar composition and structure [106]
Chitin Fungi, crustaceans Crystalline β(1→4)-GlcNAc; highly ordered, strong H-bonding Requires acidic/basic DESs; needs thermal/ultrasonic pretreatment [61]
Chitosan Deacetylated chitin Amorphous + Interfacial Linear, partially cationic; degree of deacetylation influences solubility Soluble in acidic DESs (e.g. choline chloride–lactic acid); forms gels and films [115]
Starch (Amylose) Plant storage tissues Semi-crystalline Linear α(1→4)-Glc; helical; forms double helices Requires thermal gelatinization to be solubilized in DESs [116]
Starch (Amylopectin) Plant storage tissues Amorphous (contributes to semi-crystalline lamellae in native starch) Highly branched α(1→4)/α(1→6) Glc Easily solubilized by polar DESs under mild conditions [117]
Inulin Chicory, dahlia Amorphous Linear and branched fructans (β(2→1)-linked) Fully soluble in polar DESs; enhances bioactive film formation [107,108]
β-Glucan Oats, barley, yeast Amorphous Mixed β(1→3)/(1→4)-Glc; gel-forming Soluble in neutral DESs; used in functional food and pharma [118]
Xanthan gum Bacterial EPS Amorphous β(1→4)-linked glucose backbone with charged side chains Highly soluble in DESs; enables shear-thinning formulations [119]
Alginate brown seaweed Amorphous Linear mannuronic and guluronic acid blocks; polyanionic Acidic DESs shield charges and promote solubilization [120]
Fucoidan brown seaweed Amorphous Sulfated, branched α(1→3)/α(1→4)-L-fucose Soluble in ionic and polar DESs; mild extraction preserves bioactivity [10]
Glucomannan porang (Amorphophallus muelleri Blume) Amorphous Linear β(1→4)-linked glucose and mannose Highly extractable under mild polar DESs [121]
Pullulan Fungi (Aureobasidium) Amorphous Linear α(1→6)-linked maltotriose units; non-ionic and water-soluble Compatible with polar DESs; maintains solubility across solvents [122]
Galactomannan Legumes (e.g., guar) Amorphous β(1→4)-linked mannan with α(1→6)-galactose side chains Easily solubilized in polar DESs; can be enzymatically modified [123]
Levan Bacterial (e.g., Bacillus) Amorphous β(2→6)-linked fructose units; highly branched and water-soluble Readily soluble in polar DESs; useful in prebiotic applications [124]
Dextran Bacterial (Leuconostoc) Amorphous Linear α(1→6)-Glc backbone with α(1→3/1→4) branches Soluble in mild, neutral DESs; applicable in food and pharma [125]
Carrageenan Red algae Amorphous Sulfated galactans; alternating α(1→3)/β(1→4)-linked units; gelling Soluble in ionic DESs; gelation influenced by ions and solvent polarity [126]
* Abbreviations, DES: Deep eutectic solvent, RG-I: Rhamnogalacturonan-I, HG: Homogalacturonan, Glc: Glucose, GlcNAc: N-acetylglucosamine, HBA: Hydrogen bond acceptor, EPS: Exopolysaccharide, α(1→4), β(1→4), α(1→6), β(1→3), β(1→6), etc.: Glycosidic linkages indicating position and stereochemistry of sugar bonds, Gal: Galactose, Man: Mannose, Ara: Arabinose, GalA: Galacturonic acid, GlcA: Glucuronic acid.
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