THE EFFECT OF SOLVENT AND TEMPERATURE ON PROTONATION CONSTANTS OF DL-PHENYLALANINE IN DIFFERENT AQUEOUS SOLUTIONS OF METHANOL AT DIFFERENT TEMPERATURES

Authors

  • Niloofar Soltani AHMADI Department of Food Science and Technology, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
  • Farhoush KIANI Department of Chemistry, Faculty of Science, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran. farhoush_kiani@yahoo.com
  • Seyed-Ahmad SHAHIDI Department of Food Science and Technology, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran https://orcid.org/0000-0001-5667-2875
  • Azade GHORBANI-HASANSARAEI Department of Food Science and Technology, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran https://orcid.org/0000-0001-9756-5179
  • Fatemeh ZABIHI Department of Physic, Center of Fooladin Zobe Amol, University of Applied Science and Technology, Iran
  • Fardad KOOHYAR Department of Chemistry, Rhodes University, Makhanda/Grahamstown, 6140 South Africa. fkoohyar.uni@gmail.com https://orcid.org/0000-0003-3394-019X

DOI:

https://doi.org/10.24193/subbchem.2022.4.06

Keywords:

protonation constants, DL-Phenylalanine, potentiometric, spectrophotometric, changes of enthalpy, changes of entropy, and changes of Gibbs free energy.

Abstract

This research work has two sections. In first section, the equilibrium constant for protonation processes of DL-phenylalanine (K1, and K2) were determined in binary mixed solvents of water–methanol, containing 0, 10, 20, 30, 40, 50, 60, 70, and 80 % (v/v) methanol, at T = 298.15 K and constant ionic strength (0.1 mol.dm-3NaCl). The obtained data (K1, and K2) were analyzed using Kamlet, Abboud, and Taft parameters. In second section, for DL-phenylalanine in aqueous solution, the values K1, and K2 were determined at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K and constant ionic strength (0.1 mol.dm-3NaCl). Using these K1, and K2, the thermodynamic properties (changes of enthalpy, ΔH, changes of entropy, ΔS, and changes of Gibbs free energy, ΔG) were calculated for DL-phenylalanine in aqueous solution. In both sections, the values of K1, and K2 were determined using the spectrophotometric and potentiometric methods.

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Published

2022-12-30

How to Cite

AHMADI, N. S., KIANI, F., SHAHIDI, S.-A., GHORBANI-HASANSARAEI, A., ZABIHI, F., & KOOHYAR, F. (2022). THE EFFECT OF SOLVENT AND TEMPERATURE ON PROTONATION CONSTANTS OF DL-PHENYLALANINE IN DIFFERENT AQUEOUS SOLUTIONS OF METHANOL AT DIFFERENT TEMPERATURES. Studia Universitatis Babeș-Bolyai Chemia, 67(4), 93–107. https://doi.org/10.24193/subbchem.2022.4.06

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