Partial molal volumes and adiabatic compressibilities of transfer of glycine and DL-alanine from water to aqueous sodium sulfate at 288.15, 298.15 and 308.15 K

Wadi, Ramesh K.; Ramasami, Ponnadurai

doi:10.1039/a604650i

Cited by 263 publications

(114 citation statements)

References 6 publications

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“…It should be noted that the extent of positive de- viation in ∆k s is more pronounced than in V E . This is due to the fact that the compressibility is a more powerful thermodynamic parameter in sensing the presence of intermolecular interaction than does V E [32]. The observed positive values of ∆k s (Fig.…”

Section: Resultsmentioning

confidence: 70%

Volumetric, Viscometric, and Ultrasonic Properties of Liquid Mixtures of Cyclohexane with Alkanols at Different Temperatures

Ali

Tasneem

Nabi

2010

Zeitschrift Für Naturforschung A

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The densities (ρ), viscosities (η), and ultrasonic speeds (u) of pure cyclohexane, 1-butanol, 2-butanol, and those of their binary mixtures, with cyclohexane as common component, covering the whole composition range have been measured at 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15 K. From the experimental data the excess molar volume (V E ), deviations in isentropic compressibility (∆k s ), deviations in viscosity (∆η), deviations in ultrasonic speed (∆u), deviations in acoustic impedance (∆Z), deviations in internal pressure (∆P i ), excess Gibbs free energy of activation (∆G * E ), entropies (∆S * ), and enthalpies (∆H * ) of activation of viscous flow have been determined. The sign and magnitude of these parameters were found to be sensitive towards interactions prevailing in the studied systems. Partial molar volumes (V 0 φ ,2 ) and partial molar compressibilities (K 0 φ ,2 ) of 1-butanol and 2-butanol in cyclohexane have also been evaluated. Moreover, V E values were theoretically predicted by using Flory's statistical theory. The variations of derived parameters mentioned above with composition offer a convenient method to study the nature and extent of interactions between the component molecules of the liquid mixtures, not easily obtained by other means.

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Section: Resultsmentioning

confidence: 70%

Volumetric, Viscometric, and Ultrasonic Properties of Liquid Mixtures of Cyclohexane with Alkanols at Different Temperatures

Ali

Tasneem

Nabi

2010

Zeitschrift Für Naturforschung A

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“…The reduction in electrostriction with increasing temperature is confirmed by a decrease in the hydration number. (17) Table 7 shows the temperature dependence of V o φ . The behaviour of V o φ for all the amino acids and a peptide studied in the temperature range (278.15 to 308.15) K is similar to that of typical electrolytes, for example, the value of ∂ V o φ /∂ T is positive, and the value of ∂ 2 V o φ /∂ T 2 is negative.…”

Section: Temperature Dependence Of V O φmentioning

confidence: 99%

Partial molar volumes of some amino acids and a peptide in water, DMSO, NaCl, and DMSO/NaCl aqueous solutions

Shen

Wang

et al. 2000

The Journal of Chemical Thermodynamics

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“…A number of researchers have studied the partial molal volumes and partial molal isentropic compressibilities to investigate the interactions of amino acids with simple salts such as NH 4 Cl, NaCl, KCl, Na 2 SO 4 , KSCN, MgCl 2 , CaCl 2 [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], which act as stabilizers/destabilizers. Khoshbarchi et al [28] have studied the φ o v and φ o k values of glycine in aqueous KCl and KNO 3 solutions.…”

Section: Introductionmentioning

confidence: 99%

Effect of KCl and KNO3 on Partial Molal Volumes and Partial Molal Compressibilities of Some Amino Acids at Different Temperatures

Riyazuddeen

Khan

2008

Int J Thermophys

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Density (ρ) and ultrasonic velocity (u) values of amino acids l-alanine, l-proline, l-valine, and l-leucine in 2 M aqueous KCl and 2 M aqueous KNO 3 solutions have been measured as a function of amino acid concentration at different temperatures (298.15 K, 303.15 K, 308.15 K, 313.15 K, 318.15 K, and 323.15 K). Using the ρ and u data, partial molal volume (φ o v ) and partial molal isentropic compressibility (φ o k ) values have been computed. The increase in partial molal volume with temperature has been attributed to the volume expansion of hydrated zwitterions. The φ o v and φ o k values of l-alanine, l-proline, l-valine, and l-leucine in 2 M aqueous KCl and KNO 3 solutions have been found to be larger than the corresponding values in water. The larger partial molal volumes of l-alanine, l-proline, l-valine, and l-leucine in 2 M aqueous KCl and KNO 3 solutions have been ascribed to the formation of 'zwitterion-K + /Cl − /NO 3 − ' and 'K + /Cl − /NO 3 − -water dipole' aggregates in solutions. The formation of these entities in solutions causes the release of water associated with zwitterions to the bulk water. The larger partial molal compressibilities of l-alanine-/l-proline-/l-valine-/l-leucine-2 M aqueous KCl/KNO 3 solutions than the corresponding values in water have been attributed to the formation of 'zwitterion-ion' and 'ion-water dipole' incompressible entities in solutions.

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Partial molal volumes and adiabatic compressibilities of transfer of glycine and DL-alanine from water to aqueous sodium sulfate at 288.15, 298.15 and 308.15 K

Cited by 263 publications

References 6 publications

Volumetric, Viscometric, and Ultrasonic Properties of Liquid Mixtures of Cyclohexane with Alkanols at Different Temperatures

Volumetric, Viscometric, and Ultrasonic Properties of Liquid Mixtures of Cyclohexane with Alkanols at Different Temperatures

Partial molar volumes of some amino acids and a peptide in water, DMSO, NaCl, and DMSO/NaCl aqueous solutions

Effect of KCl and KNO3 on Partial Molal Volumes and Partial Molal Compressibilities of Some Amino Acids at Different Temperatures

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