Physicochemical Behavior of Some Amino Acids/Glycylglycine in Aqueous D-Galactose Solutions at Different Temperatures
Tóm tắt
The apparent molar volumes
$${(\overline{V_2})}$$
for glycine (Gly), l-alanine (Ala), phenylalanine (Phe), and glycylglycine (Gly-Gly) in 0.10 m aqueous d-galactose solutions have been determined from density measurements at (298.15, 303.15, 308.15, and 313.15) K. The data for
$${(\overline{V_2})}$$
were utilized to estimate the partial molar volume at infinite dilution
$${(\overline{V_2^0})}$$
, and experimental slope
$${(S_{\rm v}^\ast)}$$
. The transfer volume,
$${(\overline{V_{2}^0}_{\rm (tr)})}$$
, and hydration number, (n
H) were also evaluated. The viscosity data were used to evaluate A- and B-coefficients of the Jones–Dole equation, the free energy of activation of viscous flow per mole of the solvent
$${\left(\Delta \mu_{1}^{0\ast} \right)}$$
and the solute
$${\left(\Delta \mu _{2}^{0\ast} \right)}$$
. The molar refractivity (R
D) was calculated from refractive index data. The results were discussed in terms of hydrophilic–ionic, hydrophilic–hydrophobic, and hydrophobic–hydrophobic interactions, and structure-making/-breaking ability of the solute (AAs/peptide) in aqueous d-galactose solutions.
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