Abstract
Solution calorimetry is used to obtain enthalpies of dissolution ΔsolHm of L-α-alanyl-L-α-alanine, DL-α-alanyl-DL-α-alanine, and β-alanyl-β-alanine in aqueous solutions with xylitol at concentrations of the polyatomic alcohol up to 1 mol/kg of solvent. Standard values of enthalpies of dissolution ΔsolH0 and transfer ΔtrH0 of dipeptides from water to aqueous solutions of xylitol are calculated. The calculated enthalpic coefficients of pairwise interaction between dipeptides and molecules of the polyatomic alcohol have positive and negative values. The effect the isomerism of the peptides has on the enthalpic characteristics of their interaction with xylitol in aqueous solutions is determined. An analysis is performed of the effect different types of interaction in solutions and structural features of biomolecules have on the thermochemical characteristics of solutions of oligopeptides.
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This work was financially supported by the RF Ministry of Science and Higher Education as part of State Task no. AAAA-A21-121011490059-5.
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Mezhevoi, I.N., Gromova, N.M. Effect of Structural and Optical Isomerism of Aliphatic Dipeptides on the Enthalpic Characteristics of Interaction with Xylitol in Water. Russ. J. Phys. Chem. 96, 2687–2691 (2022). https://doi.org/10.1134/S0036024422120196
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DOI: https://doi.org/10.1134/S0036024422120196