Dependence of the enthalpies of alanyl-alanine dissolution on the composition of mixed water + acetone and water + DMSO solvents at 298.15 K

被引：0
作者：
V. I. Smirnov
V. G. Badelin
机构：
[1] Russian Academy of Sciences,Krestov Institute of Solution Chemistry
来源：
Russian Journal of Physical Chemistry A | 2015年 / 89卷
关键词：
peptides; enthalpies of dissolution and transfer; aqueous-organic mixtures;
D O I：
暂无
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摘要：
The enthalpies of dissolution of two dipeptides, DL-α-alanyl-β-alanine and β-alanyl-β-alanine, in mixed solvents H2O + acetone (AC) and H2O + dimethyl sulfoxide (DMSO) are measured via calorimetry at an organic component concentration of x2 = 0–0.25 mole fraction at 298.15 K. The standard enthalpies of dissolution (ΔsolHpo) and the transfer (ΔtrHpo) of dipeptides from water to the mixed solvent and the enthalpic coefficients of pairwise interactions (hxy) with AC and DMSO molecules are calculated from these data. The effect the composition of aqueous organic mixtures has on the enthalpy characteristics of the dissolution of DL-α-alanyl-β-alanine and β-alanyl-β-alanine is considered. A comparative analysis of hxy values is performed for alanine dipeptides in the investigated mixed solvents.
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页码：1311 / 1315
页数：4
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