1Department of Applied Chemistry, Guru Nanak Dev University, Amritsar-143005, India
2Department of Chemistry, Guru Nanak Dev University, Amritsar-143005, India.
Online published on 24 February, 2012.
Potassium ions have played an important role in biological processes like sodium-potassium ion pump in our body. Apparent molar volumes, V2,f of glycine, DL-á-alanine, DL-á-amino-n-butyric acid, L-valine and L-leucine in water and in (0.25, 0.5, 0.75, 1.0, 1.5, 2.0) mol×kg−1 aqueous potassium nitrate solutions have been determined from densities measurements at various temperatures (288.15, 298.15, 308.15 and 318.15) K. The standard partial molar volumes, V20,f obtained from V2,f have been used to calculate the corresponding volume of transfer at infinite dilution, V2,f from water to aqueous potassium nitrate. The structure making/breaking capacities of these amino acids in water and also in aqueous potassium nitrate investigated have been discussed.
Amino acids, Potassium nitrate, Partial molar volume, Transfer volumes, Hydration numbers, Interaction coefficients, Partial molar expansibilities
