Influence of the inductive effect on the protolytic properties of some aliphatic amino acids
- Authors: Samadov A.S.1, Khakimov D.N.1, Stepnova A.F.2, Faizullozoda E.F.1, Kuzin A.V.3
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Affiliations:
- Tajik National University
- Peoples’ Friendship University of Russia
- Moscow Pedagogical State University
- Issue: Vol 99, No 5 (2025)
- Pages: 732-739
- Section: PHYSICAL CHEMISTRY OF SOLUTIONS
- Submitted: 02.09.2025
- Published: 15.12.2025
- URL: https://ogarev-online.ru/0044-4537/article/view/307549
- DOI: https://doi.org/10.31857/S0044453725050078
- EDN: https://elibrary.ru/hexhru
- ID: 307549
Cite item
Abstract
The protolytic propertiesof a number of aliphatic amino acids, viz. serine (Ser),cysteine (Cys), glycine (Gly), alanine (Ala), valine (Val), leucine (Leu),and isoleucine (Ile) in aqueous solutions atT = 298.2 K andI = 0.1 mol/L NaNO3are studiedby pH monitoring. Using the calculated ionization constants of aminoacids and the equation allowing one to quantify the inductiveeffect in the aliphatic series (the Taft equation), the substituentconstantσ*is calculated, with its values showing a positivecorrelation with the ionization constants of amino acids (рKi) (R2= 0.9561 andR2= 0.8542). Theresults show that the acidity of the studied amino acidsdecreases as follows Cys > Ser > Gly > Gly> Leu > Ala > Ile > Val. The acid-baseproperties of amino acids are found to change depending onthe inductive effect (the radical constantσ*). Among thestudied amino acids, Cys exhibits the highest acidity and isconsidered to be the weakest base.
About the authors
A. S. Samadov
Tajik National University
Email: s.rasul@mail.ru
Dushanbe, 734025 Tajikistan
Dzh. N. Khakimov
Tajik National University
Email: s.rasul@mail.ru
Dushanbe, 734025 Tajikistan
A. F. Stepnova
Peoples’ Friendship University of Russia
Email: s.rasul@mail.ru
Moscow, 117198 Russia
E. F. Faizullozoda
Tajik National University
Email: s.rasul@mail.ru
Dushanbe, 734025 Tajikistan
A. V. Kuzin
Moscow Pedagogical State University
Author for correspondence.
Email: s.rasul@mail.ru
Moscow, 129164 Russia
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