Enthalpies of solution of 尾-alanyl-尾-alanine in aqueous solution of amides at 298.15 K

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• 作者：Valeriy I. Smirnov ; ^{vis@isc-ras.ru} ; ^{svi5015@ivnet.ru} ; Valentin G. Badelin
• 关键词：Peptide ; Water ; Amides ; Enthalpy of solution ; Enthalpy of transfer ; Mixed solvent
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：20 May, 2012
• 卷：536
• 期：Complete
• 页码：74-76
• 文件大小：200 K

摘要

The enthalpies of solution 螖_solH^m have been determined for 尾-alanyl-尾-alanine (bAlabAla) in aqueous solutions of formamide, N-methylformamide, N,N-dimethylformamide and N,N-dimethylacetamide. The measurements were made at 298.15 K and mole fraction of amide x₂ = (0-0.35) on the precise 鈥渋soperibol鈥?calorimeter. The results obtained have been used to calculate the standard enthalpies of solution (螖_solH掳) and transfer (螖_trH掳) of bAlabAla from water into mixtures as well as the enthalpy coefficients of pairwise interaction (h_xy) of the solute with amide in aqueous media. It is established by the interrelation between enthalpy characteristics of bAlabAla dissolution (transfer) and the composition of water-amide binary mixtures.