Apparent molar volumes and viscosities of some .alpha.- and .alpha.,.omega.-amino acids in aqueous ammonium chloride solutions at 298.15 K

Natarajan, Meena; Wadi, Ramesh K.; Gaur, H. C.

doi:10.1021/je00059a024

Cited by 124 publications

(77 citation statements)

References 19 publications

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“…It is found that φ v° values of the studied homologous series of α-amino acids vary linearly with the number of carbon atoms in the alkyl chain of amino acids. Similar linear correlations have also been reported for α-amino acids [24,25], α-amino acids and glycine peptides in aqueous sodium dodecyl sulfate and cetyltrimethylammonium bromide [26], α-ω-amino acids in aqueous ammonium chloride [27], α-amino acids in aqueous calcium chloride [28], and for homologous series of α-and α-ω-amino acids in guanidium chloride and potassium thiocynate solutions [29]. This linear variation was represented by the relation…”

Section: Resultssupporting

confidence: 77%

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Ali

Shahjahan

2006

JICS

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Densities, ρ, viscosities, η, and refractive indices, n D , of glycine (Gly), DL-alanine (Ala), DL-valine (Val) (0.05, 0.10, 0.15, 0.20, 0.25 mol kg -1 ), and L-leucine (Leu) (0.02, 0.05, 0.10 mol kg -1 ) in water and in 0.20 mol kg -1 aqueous tetrapropylammonium bromide (TPAB) have been measured at 298.15, 303.15, 308.15, and 313.15 K. The density data have been utilized to calculate apparent molar volumes, φ v , partial molar volumes at infinite dilution, φ v°, and partial molar volumes of transfer, φ v°(tr) of amino acids. The viscosity data have been analyzed by means of Jones-Dole equation to obtain Falkenhagen coefficient, A, and JonesDole coefficient, B, free energy of activation of viscous flow per mole of solvent, Δμ 1°* , and solute, Δμ 2°* , and enthalpy, ΔH*, and entropy of activation , ΔS*, of viscous flow. The refractive index data have been used to calculate molar refractivity, R D, of amino acids in aqueous tetrapropylammonium bromide solutions. It has been observed that φ v°, B-coefficient and Δμ 2°* vary linearly with increasing number of carbon atoms in the alkyl chain of amino acids, and they were split to get contributions from the zwitterionic end groups (NH 3 + , COO -) and methylene group (CH 2 ) of the amino acids. The behavior of these parameters has been used to investigate the solute-solute and solute-solvent interactions as well as the effect of tetrapropylammonium cation (C 3 H 7 ) 4 N + on these interactions.

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Section: Resultssupporting

confidence: 77%

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Ali

Shahjahan

2006

JICS

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“…The increase in V o φ due to an increase in size and mass is slightly offset by a decrease due to the structure-breaking property of the "-OH' in DLserine. (16) In sodium chloride solutions, we find that the V o φ value of DL-serine is larger than that of DL-alanine.…”

Section: Influence Of Naclmentioning

confidence: 76%

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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Apparent molar volumes and viscosities of some .alpha.- and .alpha.,.omega.-amino acids in aqueous ammonium chloride solutions at 298.15 K

Cited by 124 publications

References 19 publications

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide 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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