Thermodynamic Study of Amino Acids in an Aqueous Solution of Calcium Acetate atT= 283.15-308.15 K and PressureP= 0.1 MPa: A Volumetric Approach

Manuel S. Páez Meza, Plinio Cantero-López, Yair A. Vega, Dairo E. Pérez Sotelo, Jennifer Lafont Mendoza, Luis A. Alcalá

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

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-1have been measured atT= 293.15-308.15 K and pressureP= 0.1 MPa. The infinite dilution apparent molar volumes (Vφ0) and standard volumes of transfer (ΔtrVφ0) vary linearly with those of carbon atoms in the alkyl chain of the amino acids. The contributions of the nonpolar groups to the value ofVφ0increase 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 (ΔtrVφ0) for all amino acids are positive and increase with the calcium acetate concentrations and decrease with temperature, except forl-valine andl-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.

Idioma originalInglés
Páginas (desde-hasta)4740-4750
Número de páginas11
PublicaciónJournal of Chemical and Engineering Data
Volumen66
N.º12
DOI
EstadoPublicada - 9 dic. 2021

Áreas temáticas de ASJC Scopus

  • Química (todo)
  • Ingeniería química (todo)

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