@Article{, title={Interaction of L-Threonine in aqueous THFA and in mixed aqueous solution at 298.15K}, author={Asal Ahmed Al-Jawary and Zainab Abbas Hassein Al- Dulaimy and Maida Hameed Al-Agili}, journal={journal of the college of basic education مجلة كلية التربية الاساسية}, volume={20}, number={86 / علمي}, pages={895-902}, year={2015}, abstract={

Densities and viscosities of L-Threonine in water and in mixed aqueous solution of tetrahydrofurfurylalcohol at 298.15K. On the basis of these data ,the apparent molal volumes ,partial molal volumes at infinite dilution °, the slop ,transfer volume , Gibbs free energy of activation for viscous flow of solution ΔG*1,2 and the B-coefficient have been calculated using Jones-Dole equation . The obtained thermodynamic properties have been discussed in terms of intermolecular interactions.Key word: viscosity, density, L-Threonine, tetrahydrofurfurylalcohol.Introduction In order to understand various fundamental processes like denaturation of proteins, folding / lunfolding processes, stability of proteins etc. in aqueous solution , knowledge of various solute-solvent and solute –solute interactions is very important. Due to complex structure of proteins , direct investigation of the solute /solvent effect on these biological macromolecules is very challenging, therefore, a useful approach is to study simple model compounds such as amino acid which are the monomer units of proteins molecules. The interpretation of behavior of amino-acids is quite helpful in understanding the water-protein interactions in solutions. Moreover volumetric, viscometric studies of amino acids in water and solutions of organic solvents can provide valuable information for understanding protein unfolding [1-3] and the hydrophobic interactions of non-polar side chains [4]. The amino acids are high water solubilities suggests that they exist in an ionic form (zwitter ion). In physiological media such as blood , membrans , cellular fluids , etc. , where happens to be involved in an important manner , the zwitter ionic (dipolar) character of these compounds has an important bearing on their biological functions [5]. The interactions occurring between amino acids and other components are} }