Volumetric study of aqueous proline-leucine solutions from (283.15 to 318.15) K

摘要: Abstract Density data for very diluted aqueous solutions of proline-leucine are reported eight different temperatures from (283.15 to 318.15) K. Measurements were made using a vibrating tube densimeter. Apparent molar volumes the dipeptide calculated, at each temperature, and least squares fitted linear equations. A weighted method with weighting factors inversely proportional square individual uncertainties has been used. Limiting partial volumes, V m , 2 ∞ Sv values obtained intercepts slopes those Negative lower against positive higher. Trends an evidence overwhelming contribution hydrophobic interactions temperatures. isobaric expansions, E P have also calculated temperature derivatives corresponding showing negative values. The decrease their absolute values, increasing points out predominant structure maker behaviour solute.