Enthalpic interactions of N-glycylglycine with xylitol in aqueous sodium chloride and potassium chloride solutions at T = 298.15 K |
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Authors: | Min Liu Li-Li Wang Lan-Ying Zhu Hui Li De-Zhi Sun You-Ying Di Lin-Wei Li |
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Institution: | 1. College of Chemistry and Chemical Engineering, Liao Cheng University, Liaocheng, Shandong 252059, China;2. College of Life Science and Bioengineering, Liao Cheng University, Liaocheng, Shandong 252059, China |
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Abstract: | The mixing enthalpies of N-glycylglycine with xylitol and their respective enthalpies of dilution in aqueous sodium chloride and potassium chloride solutions have been determined by using flow-mix isothermal microcalorimetry at the temperature of 298.15 K. These experimental results have been used to determine the heterotactic enthalpic interaction coefficients (hxy, hxxy, and hxyy) according to the McMillan–Mayer theory. It has been found that the heterotactic enthalpic pairwise interaction coefficients hxy between N-glycylglycine and xylitol in aqueous sodium chloride and potassium chloride solutions are negative and become less negative with an increase in the molality of sodium chloride or potassium chloride. The results are discussed in terms of solute–solute and solute–solvent interactions. |
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