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Volumetric interactions of a series of α-amino acids in aqueous magnesium chloride solutions at 278.15, 288.15, 298.15, and 308.15 K

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Abstract

In this work, the partial molar volumes of glycine, l-alanine, l-valine, l-serine, and l-threonine in aqueous solutions of magnesium chloride at 0.0, 0.1, 0.3, 0.7, and 1.0 molal are addressed between 278.15 and 308.15 K. Volumes of transfer were obtained, following the rank serine > glycine ≈ threonine > alanine > valine. Differently, the hydration numbers follow the sequence serine > valine > alanine > threonine > glycine, and dehydration of the amino acids is observed, rising the temperature or salt molality. The data suggest that interactions are mainly pairwise, between the ions and charged/hydrophilic groups of the amino acids. Within the Friedman and Krishnan formalism, a group-contribution scheme has been successfully applied to the pairwise volumetric interaction coefficient. Finally, the dehydration effect of MgCl2 on glycine, alanine, and serine has been predicted applying empirical correlations developed before, showing satisfactory results.

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Acknowledgments

This work was co-financed by FCT/MEC and FEDER under Programe PT2020 (Project UID/EQU/50020/2013), and also by QREN, ON2, and FEDER (Project NORTE-07-0162-FEDER-000050).

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Authors and Affiliations

  1. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva cesta 5, 1000, Ljubljana, Slovenia

    Ema Javornik

  2. Associate Laboratory LSRE/LCM, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5301-857, Bragança, Portugal

    Ema Javornik, Olga Ferreira & Simão P. Pinho

Authors
  1. Ema Javornik
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  2. Olga Ferreira
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  3. Simão P. Pinho
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Correspondence to Simão P. Pinho.

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Javornik, E., Ferreira, O. & Pinho, S.P. Volumetric interactions of a series of α-amino acids in aqueous magnesium chloride solutions at 278.15, 288.15, 298.15, and 308.15 K. Monatsh Chem 146, 1419–1431 (2015). https://doi.org/10.1007/s00706-015-1514-8

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  • DOI: https://doi.org/10.1007/s00706-015-1514-8

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