![]()
AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
|||||||
STUDIA CHEMIA - Ediţia nr.4 din 2022 | |||||||
Articol: |
THE EFFECT OF SOLVENT AND TEMPERATURE ON PROTONATION CONSTANTS OF DL-PHENYLALANINE IN DIFFERENT AQUEOUS SOLUTIONS OF METHANOL AT DIFFERENT TEMPERATURES. Autori: NILOOFAR SOLTANI AHMADI, FARHOUSH KIANI, SEYED-AHMAD SHAHIDI, AZADE GHORBANI-HASANSARAEI, FATEMEH ZABIHI, FARDAD KOOHYAR. |
||||||
Rezumat: DOI: 10.24193/subbchem.2022.4.06 Published Online: 2022-12-30 Published Print: 2022-12-30 pp. 93-107 VIEW PDF FULL PDF 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. Keywords: protonation constants, DL-Phenylalanine, potentiometric, spectrophotometric, changes of enthalpy, changes of entropy, and changes of Gibbs free energy. |
|||||||
![]() |
|||||||