Abstract
The mixing enthalpies of N,N′-hexamethylenebisacetamide (HMBA) with l-alanine and l-serine in aqueous glucose solutions have been determined by using mixing-flow isothermal microcalorimetry along with their dilution enthalpies at the temperature of 298.15 K. These results can be used to obtain the heterotactic enthalpic interaction coefficients (h xy , h xxy , and h xyy ) in the range of the glucose molality, (0 to 1.5) mol⋅kg−1, according to the McMillan–Mayer theory. Combining our previous research results for glycine (see Liu et al. in J. Chem. Eng. Data 55, 5258–5263, 2010), we find that the heterotactic enthalpic pairwise interaction coefficients h xy between HMBA and the investigated amino acids in aqueous glucose solutions are all positive and reach maximum values at about 0.3 mol⋅kg−1 glucose. In addition, the order for the value of h xy of the three amino acids in pure water and aqueous solution of the same glucose molality is h xy (l-alanine)>h xy (l-serine)>h xy (glycine). All variations of the heterotactic enthalpic pairwise interaction coefficients with the molalities of glucose in the quaternary systems are discussed in terms of solute–solute and solute–solvent interactions.
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The authors are grateful to the financial support provided by the National Science Foundation of China (No. 21073081) and the Doctoral Foundation of Liaocheng University (No. 31805).
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Li, G., Liu, M., Wang, L. et al. The Mixing Enthalpy Interaction Coefficients of N,N′-Hexamethylenebisacetamide with l-Alanine and l-Serine in Aqueous Glucose Solutions at 298.15 K. J Solution Chem 41, 849–863 (2012). https://doi.org/10.1007/s10953-012-9838-z
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DOI: https://doi.org/10.1007/s10953-012-9838-z