Dielectric increments of amino acids

Jt, Edward; Pg, Farrell; Jl, Job

doi:10.1021/ja00810a042

Cited by 29 publications

(7 citation statements)

References 6 publications

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“…A number of authors have reported temperature-dependent values of the dipole moment µ for R-alanine, [54][55][56][57][58] β-alanine, 54,55,57,59,60 and proline. 61,62 Most of these are estimates of the effective dipole moment in dilute solutions from molar dielectric increments δ, as defined by the Kirkwood equation: 63,64 where µ is expressed in Debye and δ is expressed in m 3 ‚mol -1 .…”

Section: Contributions To V°mentioning

confidence: 99%

Amino Acids under Hydrothermal Conditions: Apparent Molar Volumes of Aqueous α-Alanine, β-Alanine, and Proline at Temperatures from 298 to 523 K and Pressures up to 20.0 MPa

and

Tremaine

1999

J. Phys. Chem. B

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The apparent molar volumes V φ of aqueous R-alanine, β-alanine, and proline have been determined with platinum vibrating tube densitometers at temperatures from 298 to 523 K and at pressures in excess of steam saturation. Values of the standard partial molar volumes V°for the aqueous amino acids increase with temperature then deviate toward negative values at temperatures above 398 K, consistent with a lowering of the critical temperature in the solutions relative to water. This is opposite to the behavior predicted by the correlations developed by Shock and Helgeson (Geochim.

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Section: Contributions To V°mentioning

confidence: 99%

Amino Acids under Hydrothermal Conditions: Apparent Molar Volumes of Aqueous α-Alanine, β-Alanine, and Proline at Temperatures from 298 to 523 K and Pressures up to 20.0 MPa

and

Tremaine

1999

J. Phys. Chem. B

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“…In the previous paper of this series we examined the influence of the charges upon the partial molar volumes, hydrophobic hydration, and orientation of the solvent molecules around the hydrocarbon portion of a variety of aminoacids in water. Individual electrostrictive volumes of the solvent, caused by the presence of the charged groups, were evaluated from their partial molar volumes by comparison with the corresponding alkylammonium salts and sodium alkylcarboxylates, using the approaches summarized by eqn (1) and ( 2 V" = aVw+b (2) where the parameters have their previously assigned meaning^.^ It was confirmed that the major effect on electrostrictive volume, E, of the solvent molecules by aminoacids comes from the positively charged amino group, and that E could be expressed as the sum of electrostriction and hydrophobic hydration effects [eqn (3)] E = V"+VH.…”

mentioning

confidence: 99%

Partial molar volumes of organic compounds in water. Part 5.—Betaines of α,ω-aminocarboxylic acids

Shahidi¹,

Farrell²

1978

J. Chem. Soc., Faraday Trans. 1

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The partial molar volumes of a number of w-(N,N,N-trimethyl-amino)-a-carboxylic acids in water at 25°C have been measured, and related to their van der Waals volumes. The effects of progressive methylation of the nitrogen atom are examined and volume changes arising from electrostriction of the solvent or hydrophobic hydration effects are deduced. It is shown that the interaction of the trimethylalkylammonium group in the betaines with the solvent is identical to that of the alkylammonium group with the solvent in the corresponding aminoacids.

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“…A number of studies [34,45,46] have shown that intramolecular pairing does not occur with zwitterionic additives. In other words, the two charged end groups do not wrap around to form an ion pair with themselves.…”

Section: Dielectric Constantmentioning

confidence: 99%

Enhancement of electroosmotic flow using zwitterionic additives

MacDonald¹,

Sheppard²,

Lucy³

2005

Electrophoresis

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Zwitterionic additives provide a means of altering the EOF without increasing conductivity. The magnitude of the EOF in a bare silica capillary increased by as much as 69% upon addition of 500 mM of zwitterion to the running buffer. The EOF enhancement increases linearly with the zwitterion concentration. With zwitterionic additives of the form +NH3-(CH2)n-COO-, the magnitude of the EOF increase is directly related to the number of methylene groups, (n), which ranges from n = 1 to 7. The endgroups on the zwitterions also affect the EOF enhancement. The effect of Z1-methyl (+N(CH3)3CH2CH2CH2SO3-) on EOF was not a function of either the buffer cation or pH. The EOF enhancement is a function of the dielectric increment of the additive and the nature of the amine functionality.

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Dielectric increments of amino acids

Cited by 29 publications

References 6 publications

Amino Acids under Hydrothermal Conditions: Apparent Molar Volumes of Aqueous α-Alanine, β-Alanine, and Proline at Temperatures from 298 to 523 K and Pressures up to 20.0 MPa

Amino Acids under Hydrothermal Conditions: Apparent Molar Volumes of Aqueous α-Alanine, β-Alanine, and Proline at Temperatures from 298 to 523 K and Pressures up to 20.0 MPa

Partial molar volumes of organic compounds in water. Part 5.—Betaines of α,ω-aminocarboxylic acids

Enhancement of electroosmotic flow using zwitterionic additives

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