1/4/2024 0 Comments Spacechem postmortemMS/MS spectra of free ligands and of Mg 2+-L species were obtained. Matrix-assisted laser desorption mass spectrometry (MALDI-MS) was applied for the characterization of Mg 2+-L systems (L = PEA or PCC). The enthalpy changes were also determined at t = 25☌ and I = 0.15 mol L −1 by the dependence of formation constants on the temperature, confirming the electrostatic nature of the interactions. The estimated values of ligand protonation and complex formation constants and the speciation model are in accordance with the potentiometric data. 1H-NMR titrations were performed on solutions containing ligand and metal–ligand solutions at t = 25☌ and I = 0.15 mol L −1. The results evidenced the formation of three species for PEA, namely, MLH 2, MLH, and ML and two species for PPC, namely, MLH and ML. The complexation properties and the speciation of these ligands with Mg 2+ were defined under different temperatures (15 ≤ t/☌ ≤ 37) and I = 0.15 mol L −1. In the present study, the acid–base behavior of compounds constituting the headgroups of biomembranes, O-phosphorylethanolamine ( PEA), and O-phosphorylcholine ( PPC) was investigated by potentiometric titrations in NaCl aqueous solutions at different temperatures (15 ≤ t/☌ ≤ 37) and ionic strength (0.15 ≤ I/mol L −1 ≤ 1) values. 2Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Messina, Italy.1Dipartimento di Chimica e Tecnologie Chimiche, Università Della Calabria, Arcavacata di Rende (CS), Italy.Donatella Aiello 1, Massimiliano Cordaro 2,3, Anna Napoli 1, Claudia Foti 2 and Ottavia Giuffrè 2*
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |