Abstract
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.
Highlights
In recent years, the denaturation and renaturation behavior of biological molecules such as proteins in aqueous solutions has been the subject of extensive investigation [1,2,3]
We present experimental densities of glycine, L-alanine, and L-arginine in aqueous and aqueous hydroxylamine sulfate solutions of (0.10, 0.25, and 0.40) mol kg−1 at T = 298.15 K and atmospheric pressure
The measured densities of glycine, L-alanine, and L-arginine in aqueous and aqueous hydroxylamine sulfate solutions with different concentrations of (0.10, 0.25, and 0.40) mol⋅kg−1 at T = 298.15 K and atmospheric pressure have been shown in Tables 1 and 2, respectively
Summary
The denaturation and renaturation behavior of biological molecules such as proteins in aqueous solutions has been the subject of extensive investigation [1,2,3]. Volumetric and transport properties of amino acids such as density and viscosity have been extensively investigated and can provide valuable information for conformational stability and unfolding behavior of globular proteins in aqueous solutions [5,6,7,8,9,10,11,12,13]. We present experimental densities of glycine, L-alanine, and L-arginine in aqueous and aqueous hydroxylamine sulfate solutions of (0.10, 0.25, and 0.40) mol kg−1 at T = 298.15 K and atmospheric pressure. From these data, the standard partial molar volumes (V20), standard partial molar volumes of transfer (Δ trV20), and molar hydration number (NH) have been calculated. The results are discussed in terms of various solute-solute interactions and their nature occurring in the ternary systems (amino acids + hydroxylamine sulfate + water)
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