Study of the Thermochemical Aspects of the Dissolution and Solvation of Certain β-Alanyl-Dipeptides in Aqueous Solutions of Formamides at a Temperature of T = 298.15 K

IF 2.1 3区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY
Valeriy I. Smirnov*, 
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引用次数: 0

Abstract

This paper presents, for the first time, the standard values of the enthalpies of β-alanyl-l-histidine (β-Ala-L-His) dissolution (ΔsolH0) in the binary solvents water + (formamide, N-methylformamide, and N,N-dimethylformamide) at T = 298.15 K, obtained calorimetrically. Various parameters such as solvation enthalpies, (ΔsolvH0), transfer enthalpies, (ΔtrH0) and the enthalpic coefficients of pairwise interactions (hxy) were calculated from these values. The obtained data were compared with similar data for β-alanyl-β–alanine (β-Ala-β-Ala). A similar character of solvation of both peptides in mixtures of the same name has been established. This is evidenced by the linear relationship between the enthalpic coefficients of the pairwise interactions of both peptides. The solvation of peptides is weakened in the series of mixed solvents (H2O + FA) < (H2O + NMF) < (H2O + DMF), which is associated with an increase in the hydrophobic properties of the formamides and an increase in the intermolecular interactions in the mixtures themselves in the same order. However, β-Ala-L-His is more strongly solvated than β-Ala-β-Ala. This is due to the presence of specific solvation centers in the side chain of β-Ala-L-His.

Abstract Image

298.15 K温度下β-丙烯二肽在甲酰胺水溶液中溶解和溶剂化的热化学研究
本文首次给出了β-丙烯酰-l-组氨酸(β-Ala-L-His)在水+(甲酰胺、N-甲基甲酰胺和N,N-二甲基甲酰胺)二元溶剂(ΔsolH0)中T = 298.15 K时溶出焓的标准值。根据这些值计算了溶剂化焓(ΔsolvH0)、转移焓(ΔtrH0)和成对相互作用焓系数(hxy)等参数。将所得数据与β-丙烯酰-β-丙氨酸(β-Ala-β-Ala)的类似数据进行比较。两种多肽在相同名称的混合物中具有相似的溶剂化特性。这是由两个肽的成对相互作用的焓系数之间的线性关系证明。在一系列混合溶剂(H2O + FA) < (H2O + NMF) < (H2O + DMF)中,多肽的溶剂化减弱,这与甲酰胺的疏水性增加和混合物本身分子间相互作用的增加有关。然而,β-Ala- l - his比β-Ala-β-Ala溶剂化更强。这是由于在β-Ala-L-His侧链上存在特定的溶剂化中心。
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来源期刊
Journal of Chemical & Engineering Data
Journal of Chemical & Engineering Data 工程技术-工程:化工
CiteScore
5.20
自引率
19.20%
发文量
324
审稿时长
2.2 months
期刊介绍: The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.
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