The enthalpies of solution of some dipeptides in aqueous urea mixtures at T=298.15K

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

“…The more endothermic values of h xy for both AlaβAla and βAlaβAla upon interaction with AC molecules than with DMSO molecules could be due to the lower polarity and electron-donating ability of AC (μ = 2.91 D, DN = 17.0) relative to DMSO (μ = 3.96 D, DN = 29.8) [29]. It is these two properties of organic solvents that mainly determine the energy of peptide-organic solvent interaction in aqueous solutions [4,5,30].…”

“…Most works were devoted mainly to studying intermolecular interactions between α-amino acids and peptides in water [1][2][3][4], and mixed solvents [5][6][7][8][9]. In contrast, theoretical and experimental studies of the interactions between β-amino acids (peptides) and organic cosolvents in aqueous solutions are not so numerous.…”

Solution Heat of Potassium Styphnate and Caesium Styphnate in Water and DMF at 298.15 K

“…Thermo-parameter b0=-5.01999×10 -1 b1=5.44220×10 -3 b2=2.87049 For the microcosmic analysis, the dissolving processes consist of physical and chemical processes. 16,17 The physical processes need absorb caloric to break the molecular bond for diffusing solute into solvent, meanwhile the chemical processes emit caloric in chemical reaction between the solute and the solvent. 18,19 The physical processes are associated with molecular structures and polarity of solute and solvent.…”

Enthalpic pairwise self-interactions of urea and its four derivatives in (dimethylformamide + water) mixtures rich in water at T = 298.15 K

“…To provide a more complete picture of the enthalpy of interaction of urea in different solutions, Sijpkes and Somsen [31] have determined the dilution enthalpies of urea in (water + N,N-dimethylformamide (DMF)) mixtures of different mole fraction compositions at T = 298.15 K by batch microcalorimetry. Many other authors have studied the urea-nonelectrolyte enthalpic pair interactions in pure water at ambient temperature by flow or batch microcalorimetry [30,32,[37][38][39][40]. All these works give great insight to complex molecular interactions in multicomponent solutions.…”