Enthalpic interactions of N-glycylglycine with xylitol in aqueous sodium chloride and potassium chloride solutions at T=298.15K

Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

“…The interaction of two solvated species involves the partial dehydration of the solute molecules and the direct interaction caused by short-range molecular forces. − Palecz determined enthalpic interaction coefficients h xy of amino acid zwitterions with a urea molecule and discussed the effects of the direct interactions of the zwitterionic “head” and nonpolar side chains of the examined amino acid with the polar urea molecule and partial dehydration of hydration sheaths of the solute molecules on h xy . In our previous work, the effects of sodium chloride and potassium chloride on the enthalpies of mixing of N -glycylglycine with d -mannitol and xylitol were discussed in detail based on solute–solute interactions and solvation effects. , …”

“…42 In our previous work, the effects of sodium chloride and potassium chloride on the enthalpies of mixing of Nglycylglycine with D-mannitol and xylitol were discussed in detail based on solute−solute interactions and solvation effects. 44,45 For GlyGly−PCA−buffer system discussed here, the types of interaction can be classified in detail as follows: (1) partial dehydration of the hydration shell around solute molecules (including GlyGly and PCA molecules, positive contribution to , and Cl − , negative contribution to h xy ); (iii) hydrophobic−hydrophilic interactions between the benzene ring of PCA molecules and the hydrophilic groups of GlyGly molecules (positive contribution to h xy ). When PCA and GlyGly molecules approach each other, the inevitable interaction between the benzene ring of PCA molecules and the hydrophilic groups of GlyGly molecules require more energy to expel some solvent molecules from the solvation shell of the both types of groups, which make a positive contribution to h xy .…”

Enthalpy of dilution and volumetric properties of N-glycylglycine in aqueous xylitol solutions at T=298.15K

“…It is also broadly used as a sweetener in food and pharmaceutical applications. As an extension to our previous study [19,20], the present work is aimed at measuring the dilution enthalpies of N-glycylglycine (hereafter called diglycine) in aqueous xylitol solutions and the densities of the ternary systems at the temperature of 298.15 K. The homogeneous enthalpic interaction coefficients and partial molar volumes of diglycine were obtained by data processing and the results are discussed in terms of solute-solute and solute-solvent interactions.…”

Enthalpic Interaction Coefficients of N,N′-Hexamethylenebisacetamide with Glycine in Aqueous Glucose and Sucrose Solutions at 298.15 K

“…Further information about this apparatus, associated equipment, and the experimental procedure has been reported already. 19,20 To facilitate the calculation, we introduce an auxiliary function ∆H*:…”

“…According to the error propagation, the relative mean deviation of the enthalpies of dilution and mixing was less than 1 %. Further information about this apparatus, associated equipment, and the experimental procedure has been reported already. , …”