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Partial molar volumes of l-serine and l-threonine in aqueous ammonium sulfate solutions at (278.15, 288.15, 298.15, and 308.15) k
Journal article   Peer reviewed

Partial molar volumes of l-serine and l-threonine in aqueous ammonium sulfate solutions at (278.15, 288.15, 298.15, and 308.15) k

P.C. Mota, O. Ferreira, L. Hnědkovský, S.P. Pinho and I. Cibulka
Journal of Solution Chemistry, Vol.43(2), pp.283-297
2014
DOI: https://doi.org/10.1007/s10953-014-0127-x
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Abstract

In this study, the partial molar volumes of l-serine and l-threonine in aqueous solutions of ammonium sulfate at (0.0, 0.1, 0.3, 0.7, and 1.0) mol·kg-1 are reported between 278.15 and 308.15 K. Transfer volumes and hydration numbers were obtained, which are larger in l-serine than in l-threonine. Dehydration of the amino acids is observed, rising with the temperature and salt molality. The data suggest that interactions between ions and charged/hydrophilic groups are predominant, and by applying the McMillan and Mayer formalism, it was concluded that they are mainly pair wise. The combination of the data presented in this study with solubility and molecular dynamics data suggests a stronger interaction of the ammonium cation with the zwitterionic centers of the amino acids when compared to the interactions of those centers with the sulfate anion.

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2 Chemistry
2.89 Ionic, Molecular & Complex Liquids
2.89.462 Excess Molar Volumes
Web Of Science research areas
Chemistry, Physical
ESI research areas
Chemistry
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