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Thermodynamics of the Stepped Dissociation of D,L-Alanil–D,L-Phenylalanine in Aqueous Solutions

  • PHYSICAL CHEMISTRY OF SOLUTIONS
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Abstract

Calorimetry is used to determine the heats of interaction between D,L-alanil–D,L-phenylalanine and solutions of nitric acid and potassium hydroxide at 298.15 K and ionic strengths of 0.5, 0.75, and 1.0 in solutions with KNO3. Standard thermodynamic characteristics (ΔrH°, ΔrG°, ΔrS°) are calculated for acid–base interaction in aqueous solutions of D,L-alanil–D,L-phenylalanine. The effect the concentration of background electrolyte has on the heats of dissociation of D,L-alanil–D,L-phenylalanine is considered. A comparative analysis is performed of the standard thermodynamic characteristics of the stepwise dissociation of L-phenylalanine and D,L-alanil–D,L-phenylalanine in light of modern ideas about the structure and physicochemical properties of these compounds and solutions of them.

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ACKNOWLEDGMENTS

This work was performed at the Research Institute of Thermodynamics and Kinetics of Chemical Processes, Ivanovo State University of Chemistry and Technology, as part of State Task no. FZZW-2020-0009.

Funding

This work was performed on equipment at the shared resource center of Ivanovo State University of Chemistry and Technology. It was supported by the RF Ministry of Science and Higher Education, grant no. 075-15-2021-671.

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Authors and Affiliations

  1. Ivanovo State University of Chemical Technology, 153000, Ivanovo, Russia

    A. I. Lytkin, V. V. Chernikov, O. N. Krutova, P. D. Krutov & R. A. Romanov

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  1. A. I. Lytkin
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  2. V. V. Chernikov
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  3. O. N. Krutova
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  4. P. D. Krutov
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  5. R. A. Romanov
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Correspondence to O. N. Krutova.

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Lytkin, A.I., Chernikov, V.V., Krutova, O.N. et al. Thermodynamics of the Stepped Dissociation of D,L-Alanil–D,L-Phenylalanine in Aqueous Solutions. Russ. J. Phys. Chem. 96, 1698–1701 (2022). https://doi.org/10.1134/S0036024422080131

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  • DOI: https://doi.org/10.1134/S0036024422080131

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