The Viscosities of Aqueous Solutions of Amino Acids at 25 and 35°

Mason, L. S.; Kampmeyer, P. M.; Robinson, AL

doi:10.1021/ja01125a043

Cited by 32 publications

(11 citation statements)

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“…[2] qr=(q/qo)= 1 + B C + D C Z The constant B measures the size and shape effect of the solute as well as structural modification, induced by solute solvent interaction, and is the major contributor to relative viscosity in eq. [2]. The constant D is relatively small in magnitude and its significance is not clearly understood (5).…”

Section: Resultsmentioning

confidence: 99%

“…Mason et al (2), however, classified both a-alanine and p-alanine as structure makers from a study of /-differential entropies of dilution and the differential activation energy for viscous flow. The controversy seems to arise from the hydrophobic structure stabilization by the apolar groups and the structure breaking by NH3+ and C0,-groups, the net effect of which might vary under experimental conditions.…”

Section: --Amentioning

confidence: 99%

See 1 more Smart Citation

Viscosities of glycine and DL–alanine in water acetonitrile mixtures between 25 and 40 °C

Dey¹,

Saikia²,

Haque³

1980

Can. J. Chem.

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The relative viscosities and densities of glycine in 5%, 10%, 15%, and 20% w/w acetonitrile–water mixtures at 25, 30, 35, and 40 °C and of DL-alanine in water, 5%, 15%, and 20% w/w acetonitrile water mixtures at 30 and 40 °C have been determined. The viscosity B coefficients have been found to increase with increase in concentration of acetonitrile and also with the increase of temperature in both cases.The limiting apparent molar volumes and limiting value of effective flow volumes have also been calculated.

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Section: Resultsmentioning

confidence: 99%

Section: --Amentioning

confidence: 99%

Viscosities of glycine and DL–alanine in water acetonitrile mixtures between 25 and 40 °C

Dey¹,

Saikia²,

Haque³

1980

Can. J. Chem.

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“…These areas include heat capacity,9 dielectric relaxation,lo diffusion of Hi*O in salt solutions,ll thermal conductivity as interpreted by Eigen,l2 temperature of maximum density,l3 ionic mobility and its temperature coeEcient,l4 entropy of dilution,ls and temperature coefficient of relative viscosity. 16 In all of these fields there are experimental findings which have been discussed in structural terms, with generally successful results. Of special relevance to our present purpose are conclusions to be drawn from heat capacity and dielectric relaxation measurements.…”

Section: Corroborative Evidencementioning

confidence: 99%

Ion-solvent interaction. Structural aspects of ion-solvent interaction in aqueous solutions: a suggested picture of water structure

Frank¹,

Wen²

1957

Discuss. Faraday Soc.

1,888

664

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In addition to the direct action of the ionic charge on water as a dielectric medium, ions may exert an influence on the equilibrium between the ice-like and non-ice-like forms which are present in room-temperature water. This provides a way of accounting for experimental results in a variety of areas, including entropy, heat capacity, temperature of maximum density, tracer self-difhsion, thermal conductivity, and dielectric relaxation, as well as viscosity and ionic mobility and their temperature coefficients. The tetrabutyl ammonium cation acts as a structure-promoter in the same way as do non-polar soIutes, amino acids and fatty acid anions. These various effects seem explicable in a straightforward manner in terms of a new picture of water as consisting of flickering clusters of hydrogen-bonded molecules, in which the co-operative nature of cluster formation and relaxation is related to the partially covalent character which is postulated for the hydrogen bond.Liquid water has long been known to possess distinctive structural features which are roughly describable by the statement that it retains a certain degree of similarity or analogy to ice. The amount of this " ice-like-ness " may be altered by changes in temperature and pressure and, as has also been known for a long time,l alterations which are presumably comparable (e.g., shifts in the temperature of maximum density) may also be evoked by the presence of ionic solutes. There is therefore nothing very new in inquiring into the ways in which such structural changes may influence, or may, in their turn, be studied by inferences from, observable thermodynamic and kinetic properties of ionic solutions. There have, however, been a number of advances in this field in recent times, and the subject is currently of some interest. In discussing it we must remember that we are trying to get at effects over and above those which the ions are expected to produce as charged spheres in a dielectric medium, even those connected with the discrete molecular nature of the medium, such as dipole saturation in the strong field near an ion. THE SIMPLE MODEL FOR SMALL IONSAmong the last-mentioned effects, which have no apparent necessary connection with the special character of water, is the immobilization of the dipolar solvent molecules which are nearest neighbours to the ions themselves.2 About a spherical ion of radius 2-3 8, in a medium of uniform dielectric constant 80, the field strength is of the order of 106 volts/cm and, except by Gurney,3 as noted below, it seems to be generally agreed that in aqueous solutions of ions not larger than Cs+ and I-the nearest-neighbour water molecules are always essentially immobilized by direct ion-dipole interaction. This idea and the related one of electrostriction have been invoked 4 to explain the small or negative values which salt solutions display of the solute partial molal volumes, heat capacities, compressibilities, etc. It also leads to a simple explanation of the influence of LiCl, 133

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“…The data are of biophysical, physiological [1] and industrial interests [2,3]. Long ago, Traube [4] studied molal volumes [5,6] of few biomolecules, sodium and potassium chlorides [7][8][9][10][11][12], and Hua [11] and Lobo [12] had reviewed structural interactions of salts with aqueous solutions [13][14][15][16][17][18][19][20][21] only. This article contains viscosity and density data of Gly with a complete series of chloride and iodide salts.…”

Section: Introductionmentioning

confidence: 99%

Viscometric study of glycine with aqueous chloride and iodide salts of IA alkali metals

Singh¹,

Pandey²

2011

Physics and Chemistry of Liquids

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The article reports the viscosities (, kg m À1 s À1 ) of lithium to cesium chloride and iodide salts from 0.01 to 0.40 mol kg À1 at an interval of 0.005 mol kg À1 , and of glycine (Gly) from 0.01 to 0.10 mol kg À1 at an interval of 0.005 mol kg À1 with the 0.01 mol kg À1 salt solutions at 310.15 K temperature. The data were fitted in extended Jones-Dole equation for intrinsic viscosity B/kg mol À1 and slope D/(kg mol À1 ) 2 at infinite dilution (m ! 0). The B values are negative due to water structure disruption action of the salts and Gly. The B data inferred ion-ion interactions with increase in compositions and size of hydrated ion and ion-Gly associations. The B values increase with increase in composition except RbCl. The B values of the Gly are higher with RbCl and CsI due to shell-size and filled and unfilled d-orbitals of the salts. Limiting viscosities 0 quantitatively analysed ion-ion-water, Gly-ion-ion, Gly-ion-water, Gly-Gly-ion and Gly-Gly-water interactions. IntroductionViscosities of amino acids with salt solutions are interesting, particularly with the alkali metal salts of group IA as amino acids interact with electrolyte solutions. Extensive viscosity data are reported on glycine (Gly) with NaCl and KCl but no data are reported yet on halide salts of Rb þ and Cs þ . The data are of biophysical, physiological [1] and industrial interests [2,3]. Long ago, Traube [4] studied molal volumes [5,6] of few biomolecules, sodium and potassium chlorides [7-12], and Hua [11] and Lobo [12] had reviewed structural interactions of salts with aqueous solutions [13][14][15][16][17][18][19][20][21] only. This article contains viscosity and density data of Gly with a complete series of chloride and iodide salts. The þ NH 3 -CH 2 -COO -zwitterions of Gly with N þ and O À ionic atoms induce intra-and intermolecular interactions with disruption in electron distribution of dipoles. The viscosities depict the salt-amino acid interactions [22,23] and B data signify the structure-breaking actions of ions and amino acids. The structural interactions of Gly with salts depict order-to-disorder transitions in solutions.

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The Viscosities of Aqueous Solutions of Amino Acids at 25 and 35°

Cited by 32 publications

References 0 publications

Viscosities of glycine and DL–alanine in water acetonitrile mixtures between 25 and 40 °C

Viscosities of glycine and DL–alanine in water acetonitrile mixtures between 25 and 40 °C

Ion-solvent interaction. Structural aspects of ion-solvent interaction in aqueous solutions: a suggested picture of water structure

Viscometric study of glycine with aqueous chloride and iodide salts of IA alkali metals

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