Volumetric and viscometric study of amino acids in aqueous sorbitol solution at different temperatures
| Autor: | Youguang Ma, Chunying Zhu, Xiaofen Ren |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Chemistry Analytical chemistry Partial molar property 02 engineering and technology Molar absorptivity 010402 general chemistry 01 natural sciences Atomic and Molecular Physics and Optics Group contribution method Apparent molar property 0104 chemical sciences Solvent Viscosity Molar volume 020401 chemical engineering Organic chemistry General Materials Science 0204 chemical engineering Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Chemical Thermodynamics. 93:179-192 |
| ISSN: | 0021-9614 |
| DOI: | 10.1016/j.jct.2015.10.002 |
| Popis: | Densities (ρ) and viscosities (η) of glycine, l -alanine, l -valine, l -threonine and l -arginine in (0.2, 0.4, 0.6, 0.8 and 1.0) mol · kg−1 aqueous sorbitol solutions have been measured at T = (293.15, 303.15, 313.15 and 323.15) K under atmospheric pressure. The apparent molar volume (Vφ) and the limiting partial molar volumes of amino acids ( V φ 0 ) were calculated through the density data. And the limiting partial molar volumes of transfer (Δtr V φ 0 ) and interaction coefficients Vab, and Vabb were also determined. The extended Jones–Dole equation was used to correlate the viscosities in order to obtain viscosity B-coefficient and the free energies of activation per mole of solvent (Δμ10≠) and solute (Δμ20≠). The limiting partial molar volume of transfer and the free energies of activation per mole of both solvent (Δμ10≠) and solute (Δμ20≠) were discussed on the basis of the co-sphere overlap model and transition state theory, respectively. The hydration number of amino acids was computed using the obtained limiting partial molar volume and viscosity B-coefficient. Additionally, the group contribution method was applied to determine the respective contribution of (NH3+, COO−), CH2, OH and CNHNHNH2 to V φ 0 and B-coefficient. |
| Databáze: | OpenAIRE |
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