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Dezhi Sun - One of the best experts on this subject based on the ideXlab platform.
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Enthalpic Interactions of HMBA with Glycine, l-Alanine, and l-Serine in Aqueous d-Mannitol Solutions at 298.15 K
Journal of Chemical & Engineering Data, 2015Co-Authors: Chunmei Wang, Lina Dong, Min Liu, Dezhi Sun, Meiju Niu, Bingquan Wang, Han JunAbstract:The mixing enthalpies of N,N′-Hexamethylenebisacetamide (HMBA) with glycine, l-alanine, and l-serine in d-mannitol solutions with different molar fractions have been determined by means of mixing-flow isothermal microcalorimetry at 298.15 K. The heterotactic enthalpic interaction coefficients (hxy, hxxy, and hxyy), in the molar fraction (x) range of d-mannitol from (0 to 0.0159), have been calculated in terms of McMillan–Mayer theory. The trends of hxy with the molar fractions of d-mannitol have been discussed based on the interactions between solute molecules under the participation of solvent molecules. The enthalpic contribution of the functional groups of solute molecules to hxy has been estimated according to the Savage–Wood additivity group (SWAG) approach. The influence of structural difference between glucose and d-mannitol on the hxy values of HMBA with glycine has been elucidated by combining the present results with our previous work.
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enthalpies of dilution volumetric properties and refractive indices of n n Hexamethylenebisacetamide in aqueous xylitol or d mannitol solutions at t 298 15 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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Enthalpies of Dilution, Volumetric Properties, and Refractive Indices of N,N′-Hexamethylenebisacetamide in Aqueous Xylitol or d-Mannitol Solutions at T = 298.15 K
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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The Mixing Enthalpy Interaction Coefficients of N,N′-Hexamethylenebisacetamide with l-Alanine and l-Serine in Aqueous Glucose Solutions at 298.15 K
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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 mixing enthalpy interaction coefficients of n n Hexamethylenebisacetamide with l alanine and l serine in aqueous glucose solutions at 298 15 k
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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.
Min Liu - One of the best experts on this subject based on the ideXlab platform.
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Enthalpic Interactions of HMBA with Glycine, l-Alanine, and l-Serine in Aqueous d-Mannitol Solutions at 298.15 K
Journal of Chemical & Engineering Data, 2015Co-Authors: Chunmei Wang, Lina Dong, Min Liu, Dezhi Sun, Meiju Niu, Bingquan Wang, Han JunAbstract:The mixing enthalpies of N,N′-Hexamethylenebisacetamide (HMBA) with glycine, l-alanine, and l-serine in d-mannitol solutions with different molar fractions have been determined by means of mixing-flow isothermal microcalorimetry at 298.15 K. The heterotactic enthalpic interaction coefficients (hxy, hxxy, and hxyy), in the molar fraction (x) range of d-mannitol from (0 to 0.0159), have been calculated in terms of McMillan–Mayer theory. The trends of hxy with the molar fractions of d-mannitol have been discussed based on the interactions between solute molecules under the participation of solvent molecules. The enthalpic contribution of the functional groups of solute molecules to hxy has been estimated according to the Savage–Wood additivity group (SWAG) approach. The influence of structural difference between glucose and d-mannitol on the hxy values of HMBA with glycine has been elucidated by combining the present results with our previous work.
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enthalpies of dilution volumetric properties and refractive indices of n n Hexamethylenebisacetamide in aqueous xylitol or d mannitol solutions at t 298 15 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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Enthalpies of Dilution, Volumetric Properties, and Refractive Indices of N,N′-Hexamethylenebisacetamide in Aqueous Xylitol or d-Mannitol Solutions at T = 298.15 K
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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The Mixing Enthalpy Interaction Coefficients of N,N′-Hexamethylenebisacetamide with l-Alanine and l-Serine in Aqueous Glucose Solutions at 298.15 K
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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 mixing enthalpy interaction coefficients of n n Hexamethylenebisacetamide with l alanine and l serine in aqueous glucose solutions at 298 15 k
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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.
Lina Dong - One of the best experts on this subject based on the ideXlab platform.
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Enthalpic Interactions of HMBA with Glycine, l-Alanine, and l-Serine in Aqueous d-Mannitol Solutions at 298.15 K
Journal of Chemical & Engineering Data, 2015Co-Authors: Chunmei Wang, Lina Dong, Min Liu, Dezhi Sun, Meiju Niu, Bingquan Wang, Han JunAbstract:The mixing enthalpies of N,N′-Hexamethylenebisacetamide (HMBA) with glycine, l-alanine, and l-serine in d-mannitol solutions with different molar fractions have been determined by means of mixing-flow isothermal microcalorimetry at 298.15 K. The heterotactic enthalpic interaction coefficients (hxy, hxxy, and hxyy), in the molar fraction (x) range of d-mannitol from (0 to 0.0159), have been calculated in terms of McMillan–Mayer theory. The trends of hxy with the molar fractions of d-mannitol have been discussed based on the interactions between solute molecules under the participation of solvent molecules. The enthalpic contribution of the functional groups of solute molecules to hxy has been estimated according to the Savage–Wood additivity group (SWAG) approach. The influence of structural difference between glucose and d-mannitol on the hxy values of HMBA with glycine has been elucidated by combining the present results with our previous work.
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Enthalpies of Dilution, Volumetric Properties, and Refractive Indices of N,N′-Hexamethylenebisacetamide in Aqueous Xylitol or d-Mannitol Solutions at T = 298.15 K
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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enthalpies of dilution volumetric properties and refractive indices of n n Hexamethylenebisacetamide in aqueous xylitol or d mannitol solutions at t 298 15 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Lina Dong, Min Liu, Aiju Chen, Dezhi SunAbstract:The enthalpies of dilution (ΔdilHm), apparent molar volumes (Vϕ), and refractive indices (nD) of N,N′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of xylitol and d-mannitol were respectively determined at 298.15 K with the methods of isothermal microcalorimetry, density, and refractive-index measurements. The enthalpic interaction coefficients (h2, h3, and h4), limiting partial molar volumes (Vϕ0), and transfer partial molar volumes (ΔtrsVϕ0) from water to solutions and molar refractions at the sodium-D line (RD) were deduced from the experimental data in the polyols molality range (0 to 0.9) mol·kg–1. The important parameters were interpreted to understand the interactions among solvated solute molecules in HMBA–xylitol (or mannitol)–water ternary systems. The results indicated that the number of hydroxyls in the both polyols could evidently affect the parameters.
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The Mixing Enthalpy Interaction Coefficients of N,N′-Hexamethylenebisacetamide with l-Alanine and l-Serine in Aqueous Glucose Solutions at 298.15 K
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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 mixing enthalpy interaction coefficients of n n Hexamethylenebisacetamide with l alanine and l serine in aqueous glucose solutions at 298 15 k
Journal of Solution Chemistry, 2012Co-Authors: Min Liu, Lina Dong, Lili Wang, Dezhi Sun, Xilian WeiAbstract: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.
Massimo Olivotto - One of the best experts on this subject based on the ideXlab platform.
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Hybrid polar compounds produce a positive shift in the surface dipole potential of self-assembled phospholipid monolayers.
Biochimica et Biophysica Acta, 2000Co-Authors: R Herrero, Annarosa Arcangeli, Marcello Carlà, M R Moncelli, R Guidelli, Massimo OlivottoAbstract:Hybrid polar compounds (HPCs) are powerful inducers of terminal differentiation of various types of tumors, including Friend murine erythroleukemia cells (MELCs). They are known to act synergistically with an increase in the extracellular concentration of cations, which causes a positive shift in the negative value of the ionic surface potential. Two HPCs, Hexamethylenebisacetamide (HMBA) and suberoylanilide hydroxamic acid (SAHA), were adsorbed on self-assembled phospholipid monolayers supported on a mercury drop and the shift in the surface dipole potential M of the lipid film due to their adsorption was estimated from charge measurements. At their optimal concentrations for inducing MELC terminal differentiation (5 mM for HMBA and 2.6 WM for SAHA), these HPCs cause a M shift of about 15^20 mV, positive toward the hydrocarbon tails, both on neutral phosphatidylcholine films and on negatively or positively charged phosphatidylserine films. This strongly suggests that the nonspecific effect of HPCs of different structure in inducing cancer cells to rescue their differentiation program is related to a positive M shift on the extracellular side of the cell membrane. fl 2000 Elsevier Science B.V. All rights reserved.
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Electric fields at the plasma membrane level: A neglected element in the mechanisms of cell signalling
BioEssays : news and reviews in molecular cellular and developmental biology, 1996Co-Authors: Massimo Olivotto, Annarosa Arcangeli, Marcello Carlà, Enzo WankeAbstract:Membrane proteins possess certain features that make them susceptible to the electric fields generated at the level of the plasma membrane. A reappraisal of cell signalling, taking into account the protein interactions with the membrane electrostatic profile, suggests that an electrical dimension is deeply involved in this fundamental aspect of cell biology. At least three types of potentials can contribute to this dimension: (1) the potential across the compact layer of water adherent to membrane surfaces; this potential is affected by classical inducers of cell differentiation, like dimethylsulfoxide and Hexamethylenebisacetamide; (2) the potential across the Gouy-Chapman double layer, which accounts for the effects of extracellular cations in the modulation of differentiation; and (3) the resting potential. This last potential and its governing ion currents can be exploited in localised mechanisms of cell signalling centred on the functional association of integrin receptors with ion channels.
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Adsorption properties of polar/apolar inducers at a charged interface and their relevance to leukemia cell differentiation
Biophysical journal, 1995Co-Authors: Marcello Carlà, Annarosa Arcangeli, M. Cuomo, Massimo OlivottoAbstract:The interfacial adsorption properties of polar/apolar inducers of cell differentiation (PAIs) were studied on a mercury electrode. This study, on a clean and reproducible charged surface, unraveled the purely physical interactions among these compounds and the surface, apart from the complexity of the biological membrane. The interfacial behavior of two classical inducers, Hexamethylenebisacetamide (HMBA) and dimethylsulfoxide, was compared with that of a typical apolar aliphatic compound, 1-octanol, that has a similar hydrophobic moiety as HMBA but a much smaller dipolar moment. Both HMBA and Octanol adsorb flat in contact with the surface because of hydrophobic forces, with a very similar free energy of adsorption. However, the ratio of polar to apolar moieties in PAIs turned out to be crucial to drive the adsorption maximum toward physiological values of surface charge density, where octanol is desorbed. The electrostatic effects in the interfacial region reflected the adsorption properties: the changes in the potential drop across the interfacial region as a function of the surface charge density, in the physiological range, were opposite in PAIs as compared with apolar aliphatic compounds, as exemplified by octanol. This peculiar electrostatic effect of PAIs has far-reaching relevance for the design of inducers with an adequate therapeutic index to be used in clinical trials.
Ji-feng Liu - One of the best experts on this subject based on the ideXlab platform.
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Enthalpies of Dilution of N,N′-Hexamethylenebisacetamide in Pure Water and Aqueous Solutions of Alkali Halide at 298.15 K
Journal of Solution Chemistry, 2010Co-Authors: Min Liu, Ji-feng Liu, Dezhi SunAbstract:Enthalpies of dilution of N,N′-Hexamethylenebisacetamide in water and aqueous alkali halide solutions at the concentration of 0.150 mol⋅kg−1 (approximately the concentration of physiological saline) have been determined by isothermal titration microcalorimetry at 298.15 K. The enthalpic interaction coefficients in the solutions have been calculated according to the excess enthalpy concept based on the calorimetric data. The values of enthalpic pair-wise interaction coefficients (h 2) of the solute in aqueous solutions of different salts were discussed in terms of the different alkali salt ions and weak interactions of the diluted component with coexistent species as well as the change in solvent structure caused by ions.
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enthalpies of dilution of n n Hexamethylenebisacetamide in pure water and aqueous solutions of alkali halide at 298 15 k
Journal of Solution Chemistry, 2010Co-Authors: Min Liu, Ji-feng Liu, Dezhi SunAbstract:Enthalpies of dilution of N,N′-Hexamethylenebisacetamide in water and aqueous alkali halide solutions at the concentration of 0.150 mol⋅kg−1 (approximately the concentration of physiological saline) have been determined by isothermal titration microcalorimetry at 298.15 K. The enthalpic interaction coefficients in the solutions have been calculated according to the excess enthalpy concept based on the calorimetric data. The values of enthalpic pair-wise interaction coefficients (h 2) of the solute in aqueous solutions of different salts were discussed in terms of the different alkali salt ions and weak interactions of the diluted component with coexistent species as well as the change in solvent structure caused by ions.
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enthalpies of dilution and volumetric properties of n n Hexamethylenebisacetamide in aqueous solutions of sodium chloride at 298 15 k
The Journal of Chemical Thermodynamics, 2010Co-Authors: Chun-jing Chi, Min Liu, Dezhi Sun, Ji-feng LiuAbstract:Abstract Enthalpies of dilution (Δ dil H m ) of N , N ′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of sodium chloride (NaCl) were determined at 298.15 K by isothermal titration microcalorimetry. Densities ( ρ ) of the ternary homogeneous systems were also measured with a quartz vibrating-tube densimeter. The homogeneous enthalpic interaction coefficients have been calculated according to the excess enthalpy concept based on the calorimetric data. Apparent molar volumes ( V φ ) of the ternary systems were calculated from the data of densities, which have been used to deduce limiting partial molar volumes of HMBA ( V φ 0 ) and limiting partial molar volumes of transfer ( Δ trs V φ 0 ) from water to sodium chloride solutions at different concentrations. The results are discussed in terms of weak interactions of the diluted component with other species.
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Enthalpies of dilution and volumetric properties of N,N′-Hexamethylenebisacetamide in aqueous solutions of sodium chloride at 298.15 K
The Journal of Chemical Thermodynamics, 2010Co-Authors: Chun-jing Chi, Min Liu, Dezhi Sun, Ji-feng LiuAbstract:Abstract Enthalpies of dilution (Δ dil H m ) of N , N ′-Hexamethylenebisacetamide (HMBA) in aqueous solutions of sodium chloride (NaCl) were determined at 298.15 K by isothermal titration microcalorimetry. Densities ( ρ ) of the ternary homogeneous systems were also measured with a quartz vibrating-tube densimeter. The homogeneous enthalpic interaction coefficients have been calculated according to the excess enthalpy concept based on the calorimetric data. Apparent molar volumes ( V φ ) of the ternary systems were calculated from the data of densities, which have been used to deduce limiting partial molar volumes of HMBA ( V φ 0 ) and limiting partial molar volumes of transfer ( Δ trs V φ 0 ) from water to sodium chloride solutions at different concentrations. The results are discussed in terms of weak interactions of the diluted component with other species.