Densities and Viscosities of Amino Acid + Xylitol + Water Solutions at 293.15 ≤ T/K ≤ 323.15

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• 作者：Chunying ZhuXiaofen Ren ; Youguang Ma
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：62
• 期：1
• 页码：477-490
• 全文大小：410K
• ISSN：1520-5134

文摘

Densities (ρ) and viscosities (η) of aqueous xylitol solutions with glycine, l-alanine, l-valine, l-threonine, or l-arginine were measured at T = (293.15 to 323.15) K under atmospheric pressure. The density values were utilized to further calculate the apparent molar volume (V_φ), the limiting partial molar volumes of amino acids (V_φ⁰), the limiting partial molar volumes of transfer (Δ_trV_φ⁰) and the interaction coefficients V_ab, V_abb, V_abbb. The viscosity data were used to obtain viscosity B-coefficient, the free energies of activation per mole of solvent (Δμ₁^0≠) and solute (Δμ₂^0≠). The limiting partial molar volumes of transfer and the free energies of activation per mole of both solvent (Δμ₁^0≠) and solute (Δμ₂^0≠) were analyzed based on the cosphere overlap model and transition state theory, respectively. The hydration number of amino acid was determined using the obtained limiting partial molar volume and viscosity B-coefficient.