Enthalpies of solution of some L-α-amino acids in aqueous solutions of urea at 298.15 K

被引：19
|
作者：
Palecz, B [1 ]
机构：
[1] Univ Lodz, Dept Phys Chem, PL-90236 Lodz, Poland
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 1998年 / 54卷 / 01期
关键词：
aqueous solutions of urea; enthalpies of solution; L-alpha-amino acids;
D O I：
10.1023/A:1010110128337
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The standard molar enthalpies of solution of glycine, L-alpha-alanine, L-alpha-valine and L-alpha-leucine in aqueous solutions of urea at 298.15 K were determined by calorimetry. The results obtained were used to calculate the heterogeneous enthalpic interaction coefficients between the zwitterions of the L-alpha-amino acids and a molecule of urea in water. The values of the resultant enthalpic interaction coefficients are interpreted in terms of the effects of the hydrophobic alkyl groups on the interactions between the zwitterions of the L-alpha-amino acids and a polar molecule of urea in aqueous solutions.
引用
收藏
页码：265 / 269
页数：5
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