Enthalpy of dilution and volumetric properties of N-glycylglycine in aqueous xylitol solutions at T=298.15K

Liu, Min; Wang, Lili; Li, Guangqian; Dong, Lijie; Sun, Dezhi; Zhu, Lanying; Di, You-Ying

doi:10.1016/j.jct.2011.02.005

Cited by 16 publications

(15 citation statements)

References 39 publications

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“…Tomas and his co-workers studied the excess enthalpies of N -methylformamide and N -methylacetamide with aromatic compounds and the result showed partial miscibility for the system N - methylformamide– p -xylene . Among various protein model compounds, peptides have been extensively investigated because they are the basic building blocks of proteins. − In our previous work, enthalpy of dilution of N -glycylglycine in aqueous xylitol and salt solutions were determined and the results were discussed in terms of solute–solute and solute–solvent interactions. , …”

Section: Introductionmentioning

confidence: 99%

“…20−22 In our previous work, enthalpy of dilution of N-glycylglycine in aqueous xylitol and salt solutions were determined and the results were discussed in terms of solute−solute and solute−solvent interactions. 20,21 The structure and pH of solvent systems could exert an important influence on drug−protein interactions. 23−25 On one hand, PCA is a kind of phenolic acid, which will dissociate at higher pH value.…”

Section: Introductionmentioning

confidence: 99%

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Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

et al. 2015

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Protocatechuic acid (PA) is a natural phenolic compound which has been proven to have chemopreventive property against chemically induced carcinogenesis. The mixing enthalpies of PA with N-glycylglycine in sodium phosphate and potassium phosphate buffer solutions with different pH values have been investigated by mixing-flow isothermal microcalorimetry at T = 298.15 K. The heterotactic enthalpic interaction coefficients (h xy ) in the pH range of phosphate buffer solution from 3.0 to 8.0 have been calculated according to the McMillan−Mayer theory. Trends of the enthalpic pairwise interaction coefficients (h xy ) with increasing pH in both phosphate buffer solutions were obtained. The solvent and pH dependence of the h xy were discussed in terms of molecular interactions between solvated solute molecules.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

et al. 2015

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“…The experimental viscosities are slightly lower than those in the literature except for T = 293.15 K; the maximum deviation between the fitted curves by the experimental viscosities and literature values is 4.6%, and the average deviation is 2.1%. The densities and viscosities between the literature − and this work are different due to different measurement temperatures and concentrations as shown in Figure . It is worthy noting that the densities at 288.15 K in the literature are very closed to the fitted curve by the present experimental data at 293.15 K; the large discrepancy could be attributed to the differences of impurities and the measure instrument, etc.…”

Section: Results and Discussionmentioning

confidence: 65%

“…The comparisons of densities and viscosities for five amino acids with literature data could be found in our previous paper, it showed a good agreement. The comparisons of the densities and viscosities for binary solutions (xylitol + water) with literature values − are shown in Figure . The density shows a good linear relationship to the molality of xylitol, and the deviation between the fitted curves by experiment data and literature values is within ±0.1%, indicating an excellent agreement.…”

Section: Results and Discussionmentioning

confidence: 99%

“…(a), density; (b), viscosity. ⬠, 288.15 K; □, 293.15 K; ◇, 298.15 K; ○, 303.15 K; ◁, 308.15 K; △, 313.15 K; ▷, 318.15 K; ▽, 323.15 K; solid symbols for experimental data; hollow symbols for literature values in ref ; cross-filled symbols for literature values in ref ; vertical line-filled symbols for literature values in ref ; horizontal line-filled symbols for literature values in ref ; ---, fitted curve of experimental data.…”

Section: Results and Discussionmentioning

confidence: 99%

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Densities and Viscosities of Amino Acid + Xylitol + Water Solutions at 293.15 ≤ T/K ≤ 323.15

Zhu

Ren

2016

J. Chem. Eng. Data

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Densities (ρ) and viscosities (η) of aqueous xylitol solutions with glycine, l-alanine, l-valine, l-threonine, or l-arginine were measured at T = (293.15 to 323.15) K under atmospheric pressure. The density values were utilized to further calculate the apparent molar volume (V φ), the limiting partial molar volumes of amino acids (V φ 0), the limiting partial molar volumes of transfer (Δtr V φ 0) and the interaction coefficients V ab, V abb, V abbb. The viscosity data were used to obtain viscosity B-coefficient, the free energies of activation per mole of solvent (Δμ1 0≠) and solute (Δμ2 0≠). The limiting partial molar volumes of transfer and the free energies of activation per mole of both solvent (Δμ1 0≠) and solute (Δμ2 0≠) were analyzed based on the cosphere overlap model and transition state theory, respectively. The hydration number of amino acid was determined using the obtained limiting partial molar volume and viscosity B-coefficient.

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Solvation thermodynamics of xylitol in water and in aqueous amino acids at 298.15 K

Ali

Bidhuri

2012

J of Physical Organic Chem

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The scaled particle theory has been applied to calculate the free energy, ΔGsolv, enthalpy, ΔHsolv, and entropy, ΔSsolv of solvation for xylitol in water and in aqueous amino acids (glycine, alanine and valine) at 298.15 K. The solvation energy, enthalpy and entropy of xylitol are expressed in terms of their various ingredients. The results show that the interaction terms contribute favorably to the process of solvation. The results suggest that the cavity formation for accommodation of xylitol molecules in aqueous amino acids is an enthalpy‐dominated process. Furthermore, the investigated parameters indicate that xylitol–amino acid interactions follow the sequence: glycine alanine valine water. The findings of the present work may help to throw light on the role that xylitol can play to stabilize macromolecules like proteins in aqueous solutions. Copyright © 2012 John Wiley & Sons, Ltd.

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Enthalpy of dilution and volumetric properties of N-glycylglycine in aqueous xylitol solutions at T=298.15K

Cited by 16 publications

References 39 publications

Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

Densities and Viscosities of Amino Acid + Xylitol + Water Solutions at 293.15 ≤ T/K ≤ 323.15

Solvation thermodynamics of xylitol in water and in aqueous amino acids at 298.15 K

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