ABSTRACT
Amino acids can be considered as mixed solutes that contain hydrophilic groups (amine and carboxyl) and the hydrophobic aliphatic chain. These facts, combined with their biological importance, make the study of the physicochemical properties of these compounds in aqueous solvents very interesting and relevant. The information about structural changes derived from their physicochemical properties contributes to the interpretation of solute-solvent and solute-solute interactions in aqueous solutions.
The amino acids considered in this work are α-amino acids and, α,ω-amino acids. They are: glycine, DL-α-alanine (2-aminopropanoic acid), DL-α-aminobutyric acid (2-aminobutanoic acid), DL-α-norvaline (2-aminopentanoic acid), DL-α-norleucine (2-aminohexanoic acid), β-alanine (3-aminopropanoic acid), γ-aminobutyric acid (4-aminobutanoic acid), 5-aminovaleric acid (5-aminopentanoic acid), and 6-aminocaproic acid (6-aminohexanoic acid).
The compounds selected have a linear hydrocarbon chain that increases its length by one methylene group allowing the application of additivity approaches to the properties at infinite dilution of these systems.
