In the present work, densities (ρ) of glycine, l-alanine, aminobutyric acid, l-valine, and l-leucine
in an aqueous solution of calcium acetate (0.2005; 0.5998; 0.9000;
1.1978; and 1.5991) mol kg–1 have been measured
at T = 293.15–308.15 K and pressure P = 0.1 MPa. The infinite dilution apparent molar volumes
(V
φ
0) and standard volumes of transfer (Δtr
V
φ
0) vary linearly with those of carbon atoms
in the alkyl chain of the amino acids. The contributions of the nonpolar
groups to the value of V
φ
0 increase with the size of the alkyl
chain of amino acids and decrease with the concentration increase
of calcium acetate. The group-contribution of charged end groups (NH3
+, COO–) is larger than that
corresponding to alkyl chains. The standard transfer volumes (Δtr
V
φ
0) for all amino acids are positive and increase
with the calcium acetate concentrations and decrease with temperature,
except for l-valine and l-leucine. Volumetric interaction
coefficients of amino acids have been determined using the McMillan–Mayer
equation. Calcium acetate shows a strong dehydration effect on amino
acids over the entire concentration range. All results show a preferential
solvation phenomenon in the mixture due to electrostatic interactions
at the first layer solvation between the charged groups of amino acids
and the inorganic salt.
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