To elucidate the mechanism by which choline-based ionic liquids potentially can enhance the sugar conversion to bioethanol, this work was conducted to study the thermodynamic behavior of D( +)-glucose in aqueous solutions of choline-based ionic liquids, choline salicylate [Ch][Sal], choline formate [Ch][For], and choline acetate [Ch][Ace]. This study involved measuring density, speed of sound, viscosity, and electrical conductivity at various concentrations and temperatures. Analysis of the calculated parameters, including apparent molar volume, Vφ, apparent molar isentropic compressibility (κφ), viscosity B-coefficient, and molar conductivity (Λ) values provide deep insights into intermolecular interactions between the components of the solutions studied. The standard partial molar volume values (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13065_2025_1407_Article_IEq1.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$V_{\varphi }^{0}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mi>V</mi> <mrow> <mi>φ</mi> </mrow> <mn>0</mn> </msubsup> </math></EquationSource> </InlineEquation>) of D( +)-glucose, show stronger interactions between D( +)-glucose and the [Ch][Sal]. The computed transfer volume values (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13065_2025_1407_Article_IEq2.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">$\Delta_{tr} V_{\varphi }^{0}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="normal">Δ</mi> <mrow> <mi mathvariant="italic">tr</mi> </mrow> </msub> <msubsup> <mi>V</mi> <mrow> <mi>φ</mi> </mrow> <mn>0</mn> </msubsup> </mrow> </math></EquationSource> </InlineEquation>), with the help of co-sphere overlap model confirm intensified hydrophilic-hydrophilic interactions in [Ch][Sal] [(1.99 to 2.08) cm3·mol−1] solutions. Hepler's constants suggest that D( +)-glucose acts as a structure-maker in the presence of choline-based ILs, especially in [Ch][Sal] solutions. Also, the DFT-COSMO calculations result in [Ch][Sal] the most favorable interactions among the other choline based ILs. Apparent specific volume (ASV), and apparent specific isentropic compressibility, (ASIC), values revealed that D( +)-glucose exhibits the taste behavior with [Ch][Sal]. The hydration number of D( +)-glucose diminishes as the temperature rises due to weakened hydrogen bonds between D( +)-glucose and water molecules. These findings suggest that [Ch][Sal] could be a promising candidate for accelerating sugar conversion to bioethanol. Graphical Abstract

Unraveling the effect of choline-based choline based ionic liquids on the physicochemical properties and taste behavior of D( +)-glucose in aqueous solutions

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2025年2月22日

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Sara Dorosti,
Hemayat Shekaari,
Mohammad Bagheri,
Fariba Ghaffari,
Masumeh Mokhtarpour

摘要

To elucidate the mechanism by which choline-based ionic liquids potentially can enhance the sugar conversion to bioethanol, this work was conducted to study the thermodynamic behavior of D( +)-glucose in aqueous solutions of choline-based ionic liquids, choline salicylate [Ch][Sal], choline formate [Ch][For], and choline acetate [Ch][Ace]. This study involved measuring density, speed of sound, viscosity, and electrical conductivity at various concentrations and temperatures. Analysis of the calculated parameters, including apparent molar volume, V_φ, apparent molar isentropic compressibility (κ_φ), viscosity B-coefficient, and molar conductivity (Λ) values provide deep insights into intermolecular interactions between the components of the solutions studied. The standard partial molar volume values ( $V_{\varphi }^{0}$ $V_{φ}^{0}$ ) of D( +)-glucose, show stronger interactions between D( +)-glucose and the [Ch][Sal]. The computed transfer volume values ( $\Delta_{tr} V_{\varphi }^{0}$ $Δ_{tr} V_{φ}^{0}$ ), with the help of co-sphere overlap model confirm intensified hydrophilic-hydrophilic interactions in [Ch][Sal] [(1.99 to 2.08) cm³·mol⁻¹] solutions. Hepler's constants suggest that D( +)-glucose acts as a structure-maker in the presence of choline-based ILs, especially in [Ch][Sal] solutions. Also, the DFT-COSMO calculations result in [Ch][Sal] the most favorable interactions among the other choline based ILs. Apparent specific volume (ASV), and apparent specific isentropic compressibility, (ASIC), values revealed that D( +)-glucose exhibits the taste behavior with [Ch][Sal]. The hydration number of D( +)-glucose diminishes as the temperature rises due to weakened hydrogen bonds between D( +)-glucose and water molecules. These findings suggest that [Ch][Sal] could be a promising candidate for accelerating sugar conversion to bioethanol.

Graphical Abstract