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Effect of KCl and KNO 3 on Partial Molal Volumes and Partial Molal Compressibilities of Some Amino Acids at Different Temperatures

Effect of KCl and KNO 3 on Partial Molal Volumes and Partial Molal Compressibilities of Some Amino Acids at Different Temperatures,10.1007/s10765-008-

Effect of KCl and KNO 3 on Partial Molal Volumes and Partial Molal Compressibilities of Some Amino Acids at Different Temperatures
Density (ρ) and ultrasonic velocity (u) values of amino acids l-alanine, l-proline, l-valine, and l-leucine in 2M aqueous KCl and 2M aqueous KNO3 solutions have been measured as a function of amino acid concentration at different temperatures (298.15 K, 303.15 K, 308.15 K, 313.15 K, 318.15 K, and 323.15 K). Using the ρ and u data, partial molal volume ($${\phi_{\rm v}^{\rm o}}$$) and partial molal isentropic compressibility ($${\phi_{\rm k}^{\rm o} }$$) values have been computed. The increase in partial molal volume with temperature has been attributed to the volume expansion of hydrated zwitterions. The $${\phi_{\rm v}^{\rm o}}$$ and $${\phi_{\rm k}^{\rm o}}$$ values of l-alanine, l-proline, l-valine, and l-leucine in 2M aqueous KCl and KNO3 solutions have been found to be larger than the corresponding values in water. The larger partial molal volumes of l-alanine, l-proline, l-valine, and l-leucine in 2M aqueous KCl and KNO3 solutions have been ascribed to the formation of ‘zwitterion-K+/Cl−/NO3−’ and ‘K+/Cl−/NO3−–water dipole’ aggregates in solutions. The formation of these entities in solutions causes the release of water associated with zwitterions to the bulk water. The larger partial molal compressibilities of l-alanine-/l-proline-/l-valine-/l-leucine–2M aqueous KCl/KNO3 solutions than the corresponding values in water have been attributed to the formation of ‘zwitterion–ion’ and ‘ion–water dipole’ incompressible entities in solutions.
Journal: International Journal of Thermophysics - INT J THERMOPHYS , vol. 30, no. 2, pp. 475-489, 2009
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