Viscosity B-coefficients and standard partial molar volumes of amino acids, and their roles in interpreting the protein (enzyme) stabilization

2006 ◽  
Vol 122 (3) ◽  
pp. 157-183 ◽  
Author(s):  
Hua Zhao
Keyword(s):  
Amino Acids ◽  
Partial Molar Volumes ◽  
Enzyme Stabilization ◽  
Molar Volumes ◽  
B Coefficients ◽  
Protein Enzyme

scholarly journals Volumetric, viscometric and refractive index behavior of amino acids in aqueous glycerol at different temperatures

2007 ◽  
Vol 72 (5) ◽  
pp. 495-512 ◽  
Author(s):  
A. Ali ◽  
S. Khan ◽  
F. Nabi
Keyword(s):  
Amino Acids ◽  
Mixed Solvents ◽  
Partial Molar Volumes ◽  
State Theory ◽  
Apparent Molar Volumes ◽  
Ternary Mixtures ◽  
Refractive Indices ◽  
Glycerol Solution ◽  
Molar Volumes ◽  
B Coefficients

Densities, ?, viscosities, ? and refractive indices, n D, of solutions of some amino acids (glycine, DL-alanine, DL-? -amino- n-butyric acid, L-valine and L-leucine) in the concentration range 0.02 to 0.10 m in 5 % (v/v) aqueous glycerol were determined at 298.15, 303.15, 308.15 and 313.15 K. These experimental data were used to calculate the apparent molar volumes, ? v, the infinite dilution apparent molar volumes, ? v 0, the partial molar volumes of transfer, ? v 0 (tr), of the amino acids from aqueous to aqueous glycerol solution, as well as the viscosity A and B coefficients of the Jones-Dole equation of the amino acids. The free energies of activation of viscous flow, ??1 0# and ?? 2 0# per mole of solvent and solute, respectively, were obtained by application of the transition-state theory to the B coefficient data and the corresponding activation enthalpy, ?H*, and entropy, ?S*, were also determined. The ? v 0, B coefficients and ?? 2 0# were found to vary linearly with increasing number of carbon atoms in the alkyl chain of the amino acids, and they were split into contributions from the zwitterionic end groups (NH3 +, COO-) and methylene (CH2) groups of the amino acids. The experimental values of the refractive indices, n D, were used to calculate the molar refractive indices, R D, of the amino acids + aqueous glycerol ternary mixtures. The results were interpreted in the light of the solute-solvent and solute-solute interactions in the mixed solvents.

Partial molar volumes of .alpha.-amino acids with ionogenic side chains in water

1984 ◽  
Vol 88 (14) ◽  
pp. 3129-3131 ◽  
Author(s):  
M. V. R. Rao ◽  
M. Atreyi ◽  
M. R. Rajeswari
Keyword(s):  
Amino Acids ◽  
Partial Molar Volumes ◽  
Side Chains ◽  
Molar Volumes

scholarly journals Effect of Hydroxylamine Sulfate on Volumetric Behavior of Glycine,L-Alanine, andL-Arginine in Aqueous Solution

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jie Chen ◽  
Sheng Fang ◽  
Yu-Gang Shi ◽  
Yue-Cheng Meng ◽  
Da-Hai Ren
Keyword(s):  
Experimental Data ◽  
Amino Acids ◽  
Atmospheric Pressure ◽  
Partial Molar Volumes ◽  
Hydration Numbers ◽  
Molar Volumes ◽  
Mixing Effects ◽  
Sulfate Solutions ◽  
Volumetric Behavior ◽  
Hydroxylamine Sulfate

The apparent molar volumes of glycine,L-alanine, andL-arginine in aqueous hydroxylamine sulfate solutions have been determined atT=298.15 K and atmospheric pressure. The standard partial molar volumes,V20, corresponding partial molar volumes of transfer,ΔtrV20, and hydration numbers,NH, have been calculated for theseα-amino acids from the experimental data. TheΔtrV20values are positive for glycine,L-alanine, andL-arginine and are all increased with the increase in the concentration of hydroxylamine ions. These parameters obtained from the volumetric data are interpreted in terms of various mixing effects between amino acids and hydroxylamine sulfate in aqueous solutions.

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