Titre du document / Document title

Standard enthalpies of dissolution of L-alanine in the water solutions of glycerol, ethylene glycol, and 1,2-propylene glycol at 298.15 K

Auteur(s) / Author(s)

Mezhevoi I. N. ⁽¹⁾ ; Badelin V. G. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Institute of Solution Chemistry, Russian Academy of Science, 153045, Ivanovo, Russia

Résumé / Abstract

The integral enthalpies of dissolution Δ_solH^m of L-alanine in mixtures of water with glycerol, ethylene glycol, and 1,2-propylene glycol under the concentration of organic solvents up to 0.32 mole fraction were measured by means of calorimetry. The standard values of the dissolution enthalpies (Δ_solH^o) and transfer enthalpies (Δ_trH^o) of amino acids from water to the mixed solvent were calculated. It was shown that the calculated enthalpic coefficients of pair interactions of L-alanine with cosolvent molecules have positive values. The data obtained are interpreted from the viewpoint of prevalence of different types of interactions in the solutions and influence of the cosolvents nature on the thermo-chemical characteristics of amino acid dissolution.

Revue / Journal Title

Russian journal of physical chemistry. A    ISSN  1531-863X 

Source / Source

2010, vol. 84, n^o4, pp. 607-610 [4 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (2006) (Revue)

Localisation / Location

35400060438075.0015