Partial molar volumes of transfer of some amino acids from water to aqueous glycerol solutions at 25 degrees C

Apparent molar volumes of glycine, DL-alpha -alanine, L-valine, L-leucine, and L-phenylalanine in 0.5, 1.0, 2.0, 3.5, and 5.0 m(B) (mol-kg(-1)) aqueou s solutions of glycerol have been obtained from solution densities at 25 de greesC using precise vibrating-tube digital densimeter. The estimated parti al molar volumes at infinite dilution V(2)degrees have been used to obtain the corresponding transfer volumes Delta (tr)V(2)degrees from water to diff erent glycerol-water mixtures. The transfer volumes are positive for glycin e and DL-alpha -alanine, and both positive and negative for the other amino acids over the concentration range studied. Interaction coefficients have been obtained from McMillan-Mayer approach and the data have been interpret ed in terms of solute-cosolute interactions.