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<p>This study reports the density, viscosity, and refractive index data of aqueous solutions of <i>D</i>-fructose in protic ionic liquids&#xa0;(PILs): (2-hydroxyethyl) ammonium acetate [2-HEA]Ac, bis (2-hydroxyethyl) ammonium acetate [bis-2-HEA]Ac, and tris (2-hydroxyethyl) ammonium acetate [tris-2-HEA]Ac at temperature range of (298.15 to 318.15) K. The density data were utilized to calculate the apparent molar volume (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_15449_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\({V_\varphi }\)</EquationSource> </InlineEquation>) and standard partial molar expansibility (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_15449_Article_IEq2.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">\(E_{\varphi }^{0}\)</EquationSource> </InlineEquation> ). Also, the calculated standard partial molar volumes were used to study solute-solvent interactions. The results indicate stronger interactions between&#xa0;[2-HEA]Ac and <i>D</i>-fructose in water which was found to be 118.443&#xa0;m<sup>3</sup>·mol<sup>−1</sup>, compared to the other protic ionic liquids. Additionally, the viscosity <i>B</i>-coefficient was derived using the Jones-Dole equation. The molar refraction (<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_15449_Article_IEq3.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="28" /> </InlineMediaObject> <EquationSource Format="TEX">\({R_M}\)</EquationSource> </InlineEquation>) was calculated via the Lorentz–Lorenz equation, while COSMO analysis revealed that [2-HEA]Ac exhibits the most substantial interaction with <i>D</i>-fructose among the studied systems. The volumetric properties are also applied in the taste behavior of solutions,&#xa0;where changes in hydrogen bonding and solute-solvent interactions influence the perceived sweetness intensity of <i>D</i>-fructose.</p>

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Effect of 2-hydroxyethylammonium acetate based protic ionic liquids on thermophysical properties and taste behavior of D-fructose in aqueous solutions at different temperatures

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  • 发表日期：

    2025年10月1日

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  • Mohammad Amin Morsali,
  • Hemayat Shekaari,
  • Abbas Mehrdad,
  • Masumeh Mokhtarpour

摘要

This study reports the density, viscosity, and refractive index data of aqueous solutions of D-fructose in protic ionic liquids (PILs): (2-hydroxyethyl) ammonium acetate [2-HEA]Ac, bis (2-hydroxyethyl) ammonium acetate [bis-2-HEA]Ac, and tris (2-hydroxyethyl) ammonium acetate [tris-2-HEA]Ac at temperature range of (298.15 to 318.15) K. The density data were utilized to calculate the apparent molar volume ( \({V_\varphi }\) ) and standard partial molar expansibility ( \(E_{\varphi }^{0}\) ). Also, the calculated standard partial molar volumes were used to study solute-solvent interactions. The results indicate stronger interactions between [2-HEA]Ac and D-fructose in water which was found to be 118.443 m3·mol−1, compared to the other protic ionic liquids. Additionally, the viscosity B-coefficient was derived using the Jones-Dole equation. The molar refraction ( \({R_M}\) ) was calculated via the Lorentz–Lorenz equation, while COSMO analysis revealed that [2-HEA]Ac exhibits the most substantial interaction with D-fructose among the studied systems. The volumetric properties are also applied in the taste behavior of solutions, where changes in hydrogen bonding and solute-solvent interactions influence the perceived sweetness intensity of D-fructose.