Dependence of enthalpic pairwise self-interactions on ionic strength: Some 2-deoxy and N-acetyl monosaccharides in aqueous NaCl solutions at T = 298.15 K |
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| Institution: | 1. Tianjin Key Laboratory of Advanced Joining Technology, and School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. Department of Materials Science and Engineering, Virginia Tech, Blacksburg, 24061, USA;1. Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7, 87-100 Torun, Poland;2. Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences-Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, 7001, Australia;1. Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), Institute of Population and Health, College of Life Science, Northwest University, Xi’an 710069, China;2. Department of Applied Psychology, Institute of Applied Psychology, College of Public Management, Northwest University, Xi’an 710069, China;1. Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan;2. Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8511, Japan |
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| Abstract: | The dilution enthalpies of four derivatives of monosaccharides, namely 2-deoxy-d-glucose (2-DGlu), N-acetyl-d-glucosamine (GluNAc), 2-deoxy-d-galactose (2-DGal) and N-acetyl-d-galactosamine (GalNAc), in aqueous NaCl solutions of various molalities (b = 0–3.0 mol · kg?1) have been determined respectively at T = 298.15 K by isothermal titration calorimetry (MicroCal ITC200). The corresponding values of enthalpic pairwise self-interaction coefficients (h2) have been calculated according to the McMillan–Mayer theory. It was found that across the range studied of ionic strength (I) or molality (b = I), the h2 coefficients are all positive, in the order h2 (GluNAc) > h2 (GalNAc) > h2 (2-DGlu) > h2 (2-DGal), and decrease gradually after increasing first up to a maximum at b ≈ 1.5 mol · kg?1. The effects of ionic strength (I) on the trends of h2 have been discussed from the point of view of complex (solute + solute) and (solute + solvent) interactions in solutions. |
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| Keywords: | Enthalpic pairwise self-interaction Ionic strength Monosaccharides Aqueous NaCl solutions Isothermal titration calorimetry |
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